UPPCS Prelims 2019 GS Paper I PYQs with explanations

Option (a) is right: Mahatma Gandhi opposed planned development of the kind Nehru favoured. He distrusted large-scale industrialisation and centralised state planning, and preferred self-reliant village economies, cottage industries and trusteeship. Option (b), Jawaharlal Nehru, was the chief architect of planning, chairing the Planning Commission set up in 1950. Option (c), Indira Gandhi, and option (d), Rajiv Gandhi, continued five-year planning. Concept: the Gandhian Plan was drafted by S.N. Agarwal in 1944, inspired by Gandhi's ideas, while the Bombay Plan of 1944 came from industrialists. The National Planning Committee was set up by the Congress in 1938 under Nehru. The Gandhian approach appears in the DPSPs, such as Articles 40 and 43.

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Option (a) is right: both statements are true and R explains A. A is true: states ranking high on the Human Development Index, such as Kerala, Himachal Pradesh and Tamil Nadu, also top NITI Aayog's SDG India Index, while Bihar and Jharkhand are low on both. R is true: many SDG targets, especially SDG 3 on health and SDG 4 on education, overlap with the HDI's health and education dimensions. This shared ground explains much of the link, so (b) is wrong, and (c) and (d) are wrong. Concept: the SDGs, 17 goals and 169 targets, were adopted in 2015 for 2030. NITI Aayog's SDG India Index began in 2018. The SDGs also cover environment, justice and partnerships, which the HDI does not.

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Option (d) is right: the Multidimensional Poverty Index includes all three dimensions: health, education and living standards. The global MPI, made by UNDP and the Oxford Poverty and Human Development Initiative in 2010, gives the three equal weight and uses 10 indicators: nutrition and child mortality for health; years of schooling and school attendance for education; and cooking fuel, sanitation, drinking water, electricity, housing and assets for living standards. Options (a), (b) and (c) leave out one or more dimensions. Concept: a person deprived in one-third or more of the weighted indicators is counted as multidimensionally poor. NITI Aayog's national MPI adds maternal health and bank accounts. It estimated that about 24.8 crore people left multidimensional poverty between 2013-14 and 2022-23.

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Option (a) is right: the Environmental Kuznets Curve is an inverted U. As per capita income rises in the early stages of growth, environmental damage increases, reaches a peak, and then falls as richer societies demand cleaner technology and stricter rules. Option (b), an inverted V, implies a sharp peak, which is not the standard shape. Option (c), an inverted L, does not show a decline. Option (d) is wrong because (a) is correct. Concept: it is named after Simon Kuznets, who proposed an inverted-U relation between income and inequality in the 1950s. Grossman and Krueger applied the idea to the environment in the 1990s. Critics note it does not hold for carbon dioxide and that rich countries may simply shift polluting industries abroad.

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Option (c) is right: all three statements are correct. Statement 1: the National Food Security Act, 2013 covers up to 75 per cent of the rural and 50 per cent of the urban population, giving 5 kg of foodgrains per person per month, and 35 kg to Antyodaya families. Statement 2: it has special nutritional support, with meals and a maternity benefit of at least Rs 6,000 for pregnant and lactating women, and nutrition for children up to 14. Statement 3: the eldest woman aged 18 or above is the head of the household for ration cards. So options (a), (b) and (d) are wrong. Concept: overall, it covers about two-thirds of the population. Since January 2024, free foodgrains are given under the Pradhan Mantri Garib Kalyan Anna Yojana for five years.

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Option (d) is right: all three are measures of tenancy reform in India. Statement 1, regulation of rent, capped rent at about a quarter or a fifth of the produce instead of the half or more charged earlier. Statement 2, security of tenure, protected tenants from arbitrary eviction. Statement 3, conferment of ownership on tenants, gave tenants rights over the land they farmed. So options (a), (b) and (c) are incomplete. Concept: land reforms after Independence had four parts: abolition of intermediaries such as zamindars, tenancy reform, land ceilings and redistribution, and consolidation of holdings. West Bengal's Operation Barga of 1978 recorded sharecroppers' rights. The Model Agricultural Land Leasing Act of 2016 aims to legalise leasing.

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Option (c) is right: all four statements describe functions of the public sector in India. It was meant to provide public utilities such as power and railways, to build social and economic overhead capital such as infrastructure, to ensure balanced regional and sectoral growth by setting up industry in backward areas, and to pursue egalitarian goals by reducing inequality of income and wealth. Options (a), (b) and (d) each leave out one function. Concept: the Industrial Policy Resolution of 1956 reserved key industries for the state, in line with the socialist pattern of society. After 1991, the public sector's role was reduced through disinvestment and dereservation. The New Public Sector Enterprise Policy of 2021 keeps a minimum presence only in strategic sectors.

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Option (c) is right: Sikkim became the world's first fully organic state in January 2016, after phasing out chemical fertilisers and pesticides on about 75,000 hectares of farmland over about 13 years. Option (a), Queensland, option (b), California, and option (d), Quebec, are not fully organic states. Concept: Prime Minister Modi declared Sikkim organic at Gangtok in January 2016. In 2018 Sikkim won the Future Policy Gold Award, supported by the FAO, for the world's best policy on agroecology. The Sikkim Organic Mission led the change. Other schemes include the Paramparagat Krishi Vikas Yojana, which promotes organic clusters, and the Mission Organic Value Chain Development for North Eastern Region. Natural farming is promoted through the National Mission on Natural Farming.

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Option (c) is the key. The Karve Committee (IV) on village and small industries reported in 1955, so it comes first. The RBI's P.R. Nayak Committee (I) on credit to small industries reported in 1992. The Abid Hussain Committee (II) on small enterprises reported in 1997. The S.S. Kohli working group (III) on sick small units reported around 2000. The true order is IV, I, II, III, which is not offered; option (c), IV, II, I, III, alone puts Karve first and Kohli last, so it is the best answer. Options (a), (b) and (d) put Nayak or Kohli first. Concept: the MSMED Act, 2006 first defined micro, small and medium enterprises.

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Option (b) is the key: both statements true, but R is not the full explanation of A. Assertion: India's female labour force participation fell sharply, from about 31% in 2011-12 to about 23% in 2017-18 (NSSO and PLFS). Reason: more girls staying in education and higher household incomes, which let women withdraw from farm labour (the 'income effect'), do contribute. But the fall is also driven by a lack of suitable jobs near home, mechanisation of farming, social norms and how women's unpaid work is counted, so R is only partial. Options (a), (c) and (d) are therefore rejected. Concept: female participation later rose sharply, to about 40% by 2023-24 in PLFS.

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Option (c) is correct. The dependency ratio compares dependants, those aged 0-14 and 60 or over, with the working-age group of 15-59 (or 15-64). It falls when the working-age share grows faster than the dependent share. As fertility drops, fewer children are born, so a relatively large 15-59 group results. A high 0-14 population (a), a high 60+ population (b) or high dependants together (d) would raise the ratio, not lower it. Concept: this phase is the 'demographic dividend', expected to last in India until about the 2040s. India's total fertility rate is now about 2.0, below replacement level (NFHS-5).

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Option (a), usual status unemployment, is correct. NSSO's usual principal status classifies people by the activity they followed for the major part of the 365 days before the survey, so it captures chronic or long-term unemployment. Daily status (b) records activity for each half-day of the reference week and counts person-days, so it is the broadest measure of unemployment. Weekly status (c) treats a person as unemployed if they did not work even one hour during the 7-day reference week. Option (d) is wrong because (a) fits. Concept: since 2017-18 the Periodic Labour Force Survey reports usual status and current weekly status, and became monthly for CWS from 2025.

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Option (d), neither, is correct. Statement 1 is wrong because mandatory CSR came under Section 135 of the Companies Act, 2013, not a 2014 Act. Its rules took effect on 1 April 2014, which is the trap. Statement 2 is wrong because covered companies must spend at least 2%, not 1%, of their average net profit of the three previous years. CSR applies to companies with a net worth of Rs 500 crore or more, turnover of Rs 1,000 crore or more, or net profit of Rs 5 crore or more. Options (a), (b) and (c) accept a false statement. Concept: India was the first country to make CSR spending mandatory by law. Since 2019, unspent CSR money must go to a specified fund.

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Option (a), Morris D. Morris, is correct. Morris David Morris developed the Physical Quality of Life Index in 1979 for the Overseas Development Council. It averages three equally weighted indicators: infant mortality, life expectancy at age one and basic literacy, on a scale of 0-100. UNDP (b) publishes the Human Development Index but did not create the PQLI. Mahbub ul Haq (c), with Amartya Sen, designed the HDI in 1990, which uses life expectancy, education and per capita income. Option (d) is wrong since (a) fits. Concept: the PQLI was a reaction against GNP as the only measure of development. UNDP's Multidimensional Poverty Index (2010) was developed with Oxford's OPHI.

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Option (a), 100th, is correct. In the Global Hunger Index 2017, India ranked 100th of 119 countries, with a score of 31.4 in the 'serious' category. It ranked 103rd in 2018 and 102nd in 2019. Options (b) 101st, (c) 104th and (d) 105th are close distractors: India was 101st in 2021 and 105th in 2024. The GHI, now published by Concern Worldwide and Welthungerhilfe, combines undernourishment, child stunting, child wasting and under-five mortality. Concept: the Indian government has questioned the index, arguing that child-based measures and a small opinion-poll sample for undernourishment do not reflect hunger across the whole population.

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Option (b) is right: India has committed to achieve land degradation neutrality by 2030 and to restore 26 million hectares of degraded land by then, up from 21 million hectares. Prime Minister Modi announced this at the 14th Conference of Parties of the UN Convention to Combat Desertification, hosted in Greater Noida in September 2019. Option (a), 2025, option (c), 2035, and option (d), 2040, are wrong. Concept: land degradation neutrality means the amount of healthy land stays stable or grows. It is part of SDG target 15.3. ISRO's Desertification and Land Degradation Atlas found that about 30 per cent of India's land is degraded. The UNCCD was adopted in 1994 and is one of the three Rio conventions.

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Option (c) is right: in a typical ecosystem, producers are more numerous than primary consumers. Only about 10 per cent of energy passes from one trophic level to the next, so each higher level supports fewer organisms, and the pyramids of numbers and biomass are widest at the base. Option (a) is wrong because primary consumers, the herbivores, depend completely on producers. Option (b) is wrong because primary consumers do not usually outnumber producers. Option (d) is wrong because secondary consumers are fewer in number and not the largest level. Concept: the 10 per cent law was given by Raymond Lindeman in 1942. The pyramid of energy is always upright. The pyramid of numbers is inverted for a single large tree supporting many insects, and the pyramid of biomass can be inverted in the sea.

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Option (c) is right: both statements are correct. Statement 1: eutrophication is the enrichment of a water body with nutrients, mainly nitrates and phosphates from fertiliser runoff, sewage and detergents. Statement 2: it causes algal blooms; when the algae die, bacteria decomposing them use up the dissolved oxygen, which can kill fish. So options (a), (b) and (d) are wrong. Concept: this raises the biochemical oxygen demand, or BOD, of the water. Water hyacinth, called the terror of Bengal, spreads in such waters. Natural eutrophication happens slowly as lakes age, while cultural eutrophication is caused by human activity and is much faster. Dead zones form in coastal seas, such as the Gulf of Mexico. Lakes like Dal and Hussain Sagar face this problem.

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Option (b) is right: an environment modified by human activities, such as farms, settlements, dams, roads and cities, is called an anthropogenic, or man-made, environment. Option (a), the natural environment, is the part not changed by people, such as forests, rivers and mountains in their original state. Option (c), the urban environment, is only one kind of anthropogenic environment, so it is too narrow. Option (d), modern environment, is not a technical term. Concept: the word anthropogenic comes from the Greek anthropos, meaning human. Many changes to the Earth, such as climate change, deforestation and pollution, are anthropogenic. Scientists have proposed the term Anthropocene for the present period, when human activity is the main force shaping the planet, though it is not yet formally adopted.

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Option (a) is the statement that is not true, so it is the answer: species diversity does not increase from the equator towards the poles; it decreases, a pattern called the latitudinal diversity gradient. Option (b) is true: the tropics hold far more species than temperate areas. Option (c) is true: the Amazon rainforest has the greatest biodiversity on Earth. Option (d) is true: diversity falls further from temperate areas towards the poles. Concept: the tropics are richer because they have had a stable climate for a long time, more solar energy, and more niches. For example, Colombia has nearly 1,400 bird species, while New York has about 105 and Greenland about 56. India is one of 17 megadiverse countries and has four biodiversity hotspots.

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Option (a) is right: lichens are a well-known bioindicator of air pollution. They absorb water and minerals directly from the air and have no protective layer, so they are very sensitive to sulphur dioxide and disappear from polluted areas. Their presence and type are used to judge air quality. Option (b), methyl mercury, is a toxic pollutant that causes Minamata disease, not an indicator. Option (c), the rose plant, and option (d), the sunflower, are not standard bioindicators. Concept: a lichen is a symbiotic partnership of a fungus and an alga or a cyanobacterium. Lichens are also pioneer species in primary succession on bare rock. Other bioindicators include mosses for air, and Escherichia coli for faecal contamination of water.

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Option (a) is right: sodium chlorate, NaClO3, is a non-selective herbicide that kills all plant growth it touches and is used to clear weeds on railway tracks and roadsides. Option (b), potassium permanganate, is an oxidising agent used as a disinfectant, for example for washing vegetables and treating wells. Option (c), bleaching powder, or calcium oxychloride, is used to disinfect drinking water and as a bleach. Option (d) is wrong because (a) is correct. Concept: herbicides kill weeds, insecticides kill insects, fungicides kill fungi and rodenticides kill rats. Selective herbicides, such as 2,4-D, kill broadleaf weeds but spare grasses such as wheat. Glyphosate is a widely used non-selective herbicide whose use India restricted in 2022.

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Option (d) is right: methane is the gas emitted from paddy fields that adds to global warming. In flooded rice fields, methanogenic bacteria break down organic matter without oxygen and release methane, which is about 80 times stronger than carbon dioxide over 20 years. Option (a), nitrogen, is not a greenhouse gas. Option (b), carbon dioxide, is the main greenhouse gas from fuels, but it is not the gas typically linked to paddy fields. Option (c), carbon monoxide, is a toxic gas from incomplete burning. Concept: rice paddies produce about 10 per cent of global human methane emissions. Alternate wetting and drying and direct-seeded rice can cut emissions. Livestock, through enteric fermentation, is India's largest source of agricultural methane.

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Option (b) is right: the order is I, III, IV, II. The Wild Life (Protection) Act was passed in 1972. Project Tiger was launched in 1973, starting with Jim Corbett. Project Elephant began in 1992 to protect elephants, their habitats and corridors. The Biological Diversity Act came in 2002, to carry out India's duties under the Convention on Biological Diversity. Options (a), (c) and (d) put these in the wrong order. Concept: the Biological Diversity Act set up a three-tier system: the National Biodiversity Authority in Chennai, State Biodiversity Boards and local Biodiversity Management Committees. It was amended in 2023. The Wild Life Act was also amended in 2022 to implement CITES. Project Tiger and Project Elephant were merged under one division in 2023.

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Option (a) is right: both statements are true and R explains A. A is true: sustainable development is important for the well-being of human society. R is true: it quotes the Brundtland Commission's definition in Our Common Future (1987), development that meets the needs of the present without compromising the ability of future generations to meet their own needs. Because it balances present and future needs, sustainable development protects human well-being over the long term, so R explains A and (b) is wrong. Options (c) and (d) are wrong because both are true. Concept: the three pillars of sustainable development are economic, social and environmental. The Rio Earth Summit of 1992 adopted Agenda 21, and the UN adopted the 17 SDGs in 2015.

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Option (d) is right: the UN Climate Action Summit 2019 was hosted by Secretary-General Antonio Guterres at UN headquarters in New York on 23 September 2019. India announced there that it would raise its renewable energy target to 450 GW, and launched the Coalition for Disaster Resilient Infrastructure. Option (a), Paris, hosted COP21 in 2015. Option (b), Geneva, hosts many UN agencies but not this summit. Option (c), Doha, hosted COP18 in 2012. Concept: Greta Thunberg gave her How dare you speech at this summit. India and Sweden launched LeadIT, the Leadership Group for Industry Transition, there. India's 450 GW target was later turned into 500 GW of non-fossil capacity by 2030 at COP26 in Glasgow.

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Option (d) is the wrongly matched pair. The Kyoto Protocol (1997, in force 2005) under the UNFCCC set binding greenhouse gas reduction targets for developed (Annex I) countries; it has nothing to do with saving water. The other pairs are correct: the Cartagena Protocol (2000) under the CBD deals with biosafety and the transboundary movement of living modified organisms (a); the Stockholm Convention (2001) targets persistent organic pollutants such as DDT and dioxins (b); and the Montreal Protocol (1987) phases out ozone-depleting substances such as CFCs (c). Concept: the Kigali Amendment (2016) to the Montreal Protocol phases down HFCs, and the Paris Agreement (2015) succeeded Kyoto's approach.

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The official key is option (a): both statements true and R explains A. Assertion: the largest number of butterfly species is found in the tropics, especially the Neotropics and South-East Asian rainforests, because warmth, rainfall and diverse host plants allow many generations a year and high speciation. Reason, as the examiner intended: butterflies are cold-blooded (ectothermic) and need sunlight and warmth to fly, so low temperatures limit their diversity. Strictly, some species survive cold in alpine and Arctic zones by overwintering as eggs or pupae, so R is a generalisation. Options (b), (c) and (d) are rejected per key. Concept: India has about 1,300-1,500 butterfly species, richest in the Western Ghats and North-East.

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Option (b) is correct: energy decreases at each step. Under Lindeman's ten per cent law (1942), only about 10% of the energy at one trophic level is stored in the next; the rest is used in respiration, lost as heat or left in undigested matter. Option (a) is impossible because energy is not created in transfer. Option (c) is wrong because transfer is never 100% efficient, as the second law of thermodynamics shows. Option (d) is wrong because the flow is always downward and one-way. Concept: this is why food chains rarely exceed four or five links and the pyramid of energy is always upright, unlike some pyramids of numbers or biomass.

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Option (d) is correct, because smog is made by pollutants, not by normal air gases. Classical or London smog (reducing smog) comes from coal smoke and sulphur dioxide mixing with fog in cool, humid weather. Photochemical or Los Angeles smog forms when nitrogen oxides and hydrocarbons from vehicles react in sunlight, producing ozone, PAN and aldehydes. Oxygen and nitrogen (a, b, c) are the main natural components of air and cause no smog. Ozone (a, b) is a product of photochemical smog, not its root cause. Concept: the Great London Smog of 1952 killed thousands; Delhi's winter smog mixes vehicle NOx, stubble-burning smoke and temperature inversion.

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Option (b), environment conservation, is correct. UNEP launched the Global 500 Roll of Honour in 1987 to recognise individuals and organisations for outstanding work protecting and improving the environment. It ran until 2003 and was replaced in 2005 by the Champions of the Earth award, UNEP's highest environmental honour. Indian winners included Sunderlal Bahuguna of the Chipko movement and the lawyer M.C. Mehta. Gene preservation (a), population control (c) and pollution control (d) are narrower fields; pollution work could be honoured only as part of the wider environment theme. Concept: the Goldman Environmental Prize is the 'Green Nobel', and the Indira Gandhi Paryavaran Puraskar is India's top environment award.

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Option (c), the Western Ghats, is correct. Running about 1,600 km along India's west coast, the Western Ghats with Sri Lanka form one of the world's 36 biodiversity hotspots and became a UNESCO World Heritage Site in 2012. They show very high endemism, especially in amphibians, reptiles, freshwater fish and flowering plants. The Gangetic plain (a) is heavily farmed and densely populated, with low natural diversity. The Trans-Himalaya (b) is a cold desert with sparse life. Central India (d) has rich forests and tigers but lower endemism. Concept: India has four hotspots: the Himalaya, Indo-Burma, Western Ghats-Sri Lanka and Sundaland (Nicobar Islands).

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Option (a), SDG 6, is correct. SDG 6 is to 'ensure availability and sustainable management of water and sanitation for all' by 2030, covering safe drinking water, sanitation, water quality, water-use efficiency and integrated water resource management. SDG 7 (b) is affordable and clean energy; SDG 8 (c) is decent work and economic growth; and SDG 9 (d) is industry, innovation and infrastructure. Concept: the 17 SDGs were adopted in 2015 under Agenda 2030. In India, the Jal Jeevan Mission (tap water to rural homes) and the Swachh Bharat Mission (sanitation) are the main schemes aligned with SDG 6. SDG 1 is no poverty and SDG 13 is climate action.

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Option (a), the Club of Rome, is correct. The Limits to Growth (1972), written by Donella Meadows, Dennis Meadows, Jørgen Randers and others at MIT, was commissioned by the Club of Rome. Its World3 computer model warned that continued exponential growth in population, industry and resource use would hit planetary limits within a century. UNESCO (b) is the UN education and culture body. The Brundtland Commission (c) gave the 1987 report Our Common Future, which defined sustainable development. Agenda 21 (d) is the action plan adopted at the 1992 Rio Earth Summit. Concept: the Club of Rome is a think tank founded in 1968 by Aurelio Peccei.

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Option (a) is right: A-2, B-3, C-1, D-4. These are regional names for the evergreen scrub of Mediterranean-type climates, with hot dry summers and mild wet winters. Maquis grows around the Mediterranean Sea coast, fynbos in the Cape region of South Africa, chaparral in California and matorral in central Chile. Options (b), (c) and (d) mix up these names and regions, so they are wrong. Concept: the fifth Mediterranean region is south-western Australia, where the scrub is called mallee or kwongan. These plants have small, leathery, waxy leaves to reduce water loss, and many are adapted to fire. The fynbos is one of the richest plant regions in the world, the Cape Floral Kingdom. Such regions grow citrus fruits, grapes and olives.

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Option (a) is right: A-1, B-2, C-3, D-4. The capital of Uzbekistan is Tashkent, of Tajikistan Dushanbe, of Kyrgyzstan Bishkek and of Turkmenistan Ashgabat. Options (b), (c) and (d) switch Bishkek and Ashgabat or mix up Dushanbe, so they are wrong. Concept: these four countries, with Kazakhstan, whose capital is Astana, make up Central Asia; all were part of the Soviet Union until 1991. India links with them through the India-Central Asia Summit, the Shanghai Cooperation Organisation and the planned TAPI gas pipeline from Turkmenistan through Afghanistan and Pakistan. Tajikistan borders Afghanistan near the Wakhan Corridor, and India once used the Ayni airbase there. Uzbekistan is doubly landlocked.

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Option (a) is right: A-2, B-3, C-4, D-1. Epiphytes, plants such as orchids and ferns that grow on other trees, are typical of the dense equatorial rainforest, where they climb towards light. Acacia, a thorny tree that tolerates drought, is characteristic of the Sahara margins. The baobab, with its thick water-storing trunk, is the signature tree of the African savanna. Cedars grow in the Mediterranean lands; the cedar of Lebanon is the most famous. Options (b), (c) and (d) mismatch these. Concept: natural vegetation follows climate: tall broadleaf evergreens in equatorial regions, grasses with scattered trees in savannas, thorny scrub in deserts, evergreen shrubs in Mediterranean lands, and conifers in cool temperate and mountain areas.

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Option (d) is the incorrect pair, so it is the answer: the Kirghiz are pastoral nomads of the Central Asian highlands, in Kyrgyzstan, the Pamirs and the Tien Shan, not of Sudan. Option (a) is correct: the Pygmies live as hunter-gatherers in the forests of the Congo basin. Option (b) is correct: the Angami are a major Naga tribe of Nagaland, near Kohima. Option (c) is correct: the Ainu are the indigenous people of Hokkaido in Japan. Concept: other tribes linked to regions include the Bushmen, or San, of the Kalahari, the Masai of the East African savanna, the Bedouins of the Arabian desert, the Eskimos or Inuit of the Arctic, and the Semang of Malaysia. Sudan has groups such as the Dinka and Nuer.

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Option (b) is right per the key: both statements are true, but R is not treated as the correct explanation of A. A is true: major powers keep bases in the Indian Ocean, such as the USA at Diego Garcia, France at Reunion and Djibouti, and China at Djibouti. R is true: the ocean and its littoral states carry great geopolitical value, with sea lanes for Gulf oil and Asia-Europe trade, and chokepoints such as Hormuz, Bab-el-Mandeb and Malacca. The key treats R as a general statement rather than the specific cause of the bases, so (a) is not accepted. Options (c) and (d) are wrong because both are true. Concept: India's maritime vision is SAGAR, and it was a founder of the Indian Ocean Rim Association. In 1971 the UN declared the Indian Ocean a zone of peace.

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Option (b) is right: from west to east, the hills of central India run Satpura, Mahadeo, Maikal and then Chhotanagpur. The Satpura hills proper lie in the west, the Mahadeo hills with Pachmarhi in the middle, and the Maikal range with Amarkantak, source of the Narmada and Son, in the east. The Chhotanagpur plateau lies further east, in Jharkhand. Options (a), (c) and (d) put these in the wrong order, for example placing Maikal first or Chhotanagpur before Maikal. Concept: the Satpura range lies between the Narmada and Tapi rivers. Dhupgarh, in the Mahadeo hills, is its highest peak. The Vindhyas run north of the Narmada, and the Narmada flows west through a rift valley between the two ranges.

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Option (a) is right: both statements are true and R explains A. Most of India's seismic zones IV and V lie along the Himalaya, because the Indian plate is still pushing under the Eurasian plate. The range is cut by long thrust faults running along its length, the Main Central Thrust, the Main Boundary Thrust and the Main Frontal Thrust, where stress builds up and is released as earthquakes. So (b) is wrong, and (c) and (d) are wrong because both are true. Concept: India has four seismic zones, II to V, with V the most severe; zone V also covers the North-East, Kutch and the Andaman and Nicobar Islands. Major Himalayan quakes include Uttarkashi 1991 and Kashmir 2005. Nepal's 2015 quake was on the Main Himalayan Thrust.

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Option (a) is right: the Imphal Basin is a fine example of a lacustrine plain. It is the bed of an old lake ringed by the Manipur hills, and its flat floor is made of lake deposits; Loktak Lake is a surviving remnant. Option (b), a loess plain, is made of wind-blown dust, as in north China. Option (c), a glacial plain, is formed by deposits of ice sheets, as in northern Europe. Option (d), an alluvial plain, is formed by river deposits, like the Ganga plain. Concept: lacustrine plains form when lakes fill with sediment or dry up, as in the Kashmir valley's karewas. Loktak has floating islands called phumdis, and on them Keibul Lamjao, the only floating national park, home of the Sangai deer.

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Option (b) is right: the Damodar is famous for flowing through a rift, or fault-bounded, valley on the Chhotanagpur plateau. The down-faulted blocks preserved the Gondwana coal seams of Jharia, Raniganj and Bokaro, making it India's chief coal belt. Option (a), the Chambal, is famous for its badland ravines. Option (c), the Gandak, is a Himalayan river that brings floods to north Bihar. Option (d), the Ramganga, is a Himalayan tributary of the Ganga in Uttarakhand and Uttar Pradesh. Concept: other rift valley rivers are the Narmada and Tapi, which flow west into the Arabian Sea and form estuaries rather than deltas. The Damodar Valley Corporation of 1948 was India's first multipurpose river valley project, modelled on the Tennessee Valley Authority.

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Option (d) is right: the tropical savanna region, especially the African savanna, is called the land of big game. Its open grasslands with scattered trees support huge herds of zebra, wildebeest, giraffe, elephant and antelope, and predators such as lions, leopards and cheetahs. Option (a), the temperate grassland, has fewer large animals and is mostly farmed now. Option (b), the tropical monsoon region, is densely populated and farmed. Option (c), the hot desert region, supports little wildlife because water is scarce. Concept: savannas lie between the equatorial forests and the hot deserts and have a wet summer and long dry winter. Famous game parks include the Serengeti in Tanzania and the Masai Mara in Kenya. Big game hunting is now banned in most countries.

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Option (d) is right per the key: all three statements are treated as correct. Statement 1: the Greater Himalaya, or Himadri, is mostly crystalline and metamorphosed rock such as granite and gneiss, so textbooks call it unfossiliferous. Statement 2: the upper sedimentary beds of the Lesser Himalaya, such as the Krol and Tal formations near Mussoorie and Nainital, contain marine fossils. Statement 3: the Shivaliks hold vertebrate fossils and Palaeolithic Sohanian tools, which are traces of early humans rather than a true civilisation. Since all three hold in the textbook sense, options (a), (b) and (c) are incomplete. Concept: the Himalaya rose from the Tethys Sea as the Indian plate collided with Eurasia. Read each statement against textbook classifications, and watch for loose words like civilisation.

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Option (d) is right: from north to south along the Suez Canal, the lakes are Lake Manzala, Lake Timsah, the Great Bitter Lake and the Little Bitter Lake. The canal starts at Port Said on the Mediterranean, passes Lake Manzala, reaches Lake Timsah at Ismailia, crosses the Great and then the Little Bitter Lakes, and ends at Suez on the Red Sea. Option (a) puts Manzala last, option (b) reverses the order, and option (c) places the Bitter Lakes before Timsah, so all are wrong. Concept: the canal is about 193 km long and has no locks. A second channel, the New Suez Canal, opened in 2015 to allow two-way traffic. In March 2021 the ship Ever Given blocked the canal for six days. Houthi attacks in the Red Sea from late 2023 cut traffic sharply.

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Option (a) is right: the Telegraphic Plateau is part of the North Atlantic, or Mid-Atlantic, Ridge, lying between Ireland and Newfoundland. It is named after the transatlantic telegraph cables laid across it in the 19th century, the first in 1858. Option (b), the South Atlantic Ridge, has features such as the Challenger Rise. Option (c), the Indian Ocean Ridge, has features like the Carlsberg Ridge. Option (d) is wrong because (a) is correct. Concept: the Mid-Atlantic Ridge is a divergent plate boundary, where new ocean floor forms by sea-floor spreading. Iceland lies on the ridge above sea level. In the North Atlantic the ridge is called the Dolphin Rise, and in the south the Challenger Rise. Ocean ridges together form the world's longest mountain chain.

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Option (d) is right: A-2, B-3, C-1, D-4. Tropical cyclones are called willy-willies in north-west Australia, taifu or typhoons in Japan and the western Pacific, baguio in the Philippines, and hurricanes in the USA and the Caribbean. Options (a), (b) and (c) mismatch these regional names. Concept: in the Indian Ocean they are simply called cyclones. Tropical cyclones form over warm seas above about 27 degrees Celsius, need the Coriolis force, so they do not form within about 5 degrees of the equator, and rotate anticlockwise in the northern hemisphere. The IMD in New Delhi names north Indian Ocean cyclones from a list given by member countries. Tornadoes are much smaller and form over land.

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Option (c) is right: Sochi is not on the Trans-Siberian Railway. It is a Black Sea resort in southern Russia, which hosted the 2014 Winter Olympics. Option (a), Kazan, lies on the northern variant of the route through Kazan and Yekaterinburg. Option (b), Omsk, and option (d), Chita, lie on the main line in Siberia. Concept: the Trans-Siberian Railway, about 9,289 km long, runs from Moscow to Vladivostok on the Pacific and is the world's longest railway line. It was built from 1891 to 1916. Other cities on it include Yekaterinburg, Novosibirsk, Krasnoyarsk, Irkutsk near Lake Baikal, and Khabarovsk. Its branches link to Mongolia and China. The Baikal-Amur Mainline runs further north.

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Option (d) is the incorrect pair, so it is the answer: the mistral is a cold, dry northerly wind that blows down the Rhone valley in France to the Mediterranean, not in Australia. Option (a) is correct: the Santa Ana is a hot, dry wind of southern California, linked to wildfires. Option (b) is correct: the haboob is a dust storm of Sudan. Option (c) is correct: the yamo is a local wind of Japan. Concept: other local winds to know are the foehn of the Alps, the chinook of the Rockies, called the snow eater, the sirocco from the Sahara to Italy, the harmattan of West Africa, called the doctor, the bora of the Adriatic, the loo of north India and the brickfielder of Australia, which is the correct Australian match.

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Option (a) is right: A-4, B-1, C-2, D-3. The Talcher coalfield in Odisha is in the Mahanadi valley. The Karanpura coalfield in Jharkhand is in the Damodar valley. The Singrauli coalfield on the Madhya Pradesh-Uttar Pradesh border is in the Son valley. The Singareni coalfield in Telangana is in the Godavari valley. Options (b), (c) and (d) mismatch these. Concept: about 98 per cent of India's coal comes from Gondwana rocks, which lie in these river valleys: Damodar, Son, Mahanadi, Godavari and Wardha. Tertiary coal is found in the North-East and is younger and poorer. Jharkhand has the largest coal reserves, and Odisha and Chhattisgarh are now among the largest producers. Singrauli is called India's energy capital.

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Option (a) is right: Gurla Mandhata, at 7,694 metres, stands in Tibet, near Lake Manasarovar and Mount Kailash, so it is not in India. Option (b), Namcha Barwa, also lies in Tibet at the great bend of the Brahmaputra, but India usually counts it as the eastern anchor of the Himalaya, so the key does not treat it as the answer. Option (c), Kamet, is in Uttarakhand. Option (d), Nanga Parbat, is in Gilgit-Baltistan, part of Jammu and Kashmir as claimed by India; it is the western anchor of the Himalaya. Concept: the highest peak in India as claimed is K2 in the Karakoram, and the highest wholly within India is Kangchenjunga, on the Sikkim-Nepal border. Nanda Devi is the highest peak entirely in Indian territory.

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Option (b) is right: the winter rain brought by western disturbances in the north-western plain of India decreases from west to east. Western disturbances are low-pressure systems that start over the Mediterranean, travel with the westerly jet stream and enter India from the north-west. They bring the most winter rain to Punjab, Haryana and western Uttar Pradesh, and the rain weakens as they move east down the plain. Options (a), (c) and (d) give the wrong direction. Concept: this winter rain, called mahawat in parts, is vital for the rabi crop, especially wheat. Western disturbances also bring snow to the western Himalaya. The Coromandel coast of Tamil Nadu gets its winter rain from the north-east monsoon instead.

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Option (b) is right: the Luni has fresh water in its upper course and saline water in its lower part. It rises near Ajmer in the Aravallis with fresh water, but below Balotra it turns brackish as it picks up salts from the arid soils of western Rajasthan, and it ends in the Rann of Kutch. Option (a), the Barak, flows through Manipur, Assam and Bangladesh and is fresh. Option (c), the Ghaggar, is a seasonal river that dries up in the Thar. Option (d) is wrong because (b) is correct. Concept: the name Luni comes from the Sanskrit lavanavari, meaning salt river. It is an inland drainage river that does not reach the sea. The Ghaggar is often linked to the ancient Saraswati.

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Option (c) is right: the moribund delta is a subdivision of the Bengal, or Ganga-Brahmaputra, delta. It lies in the north-west, where distributaries like the Bhagirathi-Hooghly and others such as the Jalangi have silted up, so the land is no longer being built up. Option (a), the Krishna-Godavari delta, option (b), the Mahanadi delta, and option (d), the Cauvery delta, are not divided this way. Concept: the Bengal delta is divided into the moribund, or dying, delta in the north-west, the mature delta in the centre and the active delta in the south-east, where the Padma and Meghna still deposit silt. It is the world's largest delta, and the Sundarbans mangroves lie on its seaward edge. The Farakka Barrage was built partly to revive the Hooghly.

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Option (d), reflecting power, is correct. Albedo is the fraction of incoming solar radiation a surface reflects back, from 0 (absorbs all) to 1 (reflects all). Fresh snow reflects about 80-90%, deserts around 30-40%, forests and oceans far less, and the earth's average is about 0.3. Transmitting power (a) is about radiation passing through a medium; absorbing power (b) is the opposite of albedo; emissive power (c) concerns radiation a body gives out according to its temperature. Concept: melting ice lowers albedo, so the ground absorbs more heat and warms further; this ice-albedo feedback is why the Arctic warms faster than the global average.

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Option (b) is right: both statements are true, but R does not explain A. A is true: like Sher Shah, Akbar regulated the currency, issuing well-made coins of standard weight and purity and placing mints under a central officer. R is true: as in Sher Shah's system, the chief copper coin was the dam, with 40 dams to a rupee. But the dam being the main copper coin shows continuity of the system, not the reason Akbar regulated it, so (a) is wrong. Options (c) and (d) are wrong because both are true. Concept: Sher Shah introduced the silver rupiya of about 178 grains. Akbar's gold coin was the mohur, and he issued Ilahi coins. The word rupee comes from Sher Shah's rupiya.

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Option (a) is right: the order is II, I, III, IV. The battle of Bilgram, or Kannauj, came first in 1540, when Sher Shah defeated Humayun, who fled to Persia. Akbar won the battle of Sarnal in Gujarat in 1572. Aurangzeb defeated Jaswant Singh, sent by Dara Shikoh, at Dharmat in 1658 during the war of succession. Bahadur Shah I defeated his brother Azam Shah at Jajau, near Agra, in 1707, after Aurangzeb's death. Options (b), (c) and (d) put these in the wrong order. Concept: other key Mughal battles include Panipat in 1526, Khanwa in 1527, Chausa in 1539, the second Panipat in 1556, Haldighati in 1576 and Samugarh in 1658.

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Option (c) is right: both statements are correct. Statement 1: Hatha yoga was the core discipline of the Nath yogis of Gorakhnath's order, who used bodily postures and breath control for spiritual ends. Statement 2: Indian Sufis adopted some of its techniques, especially breath control; the Amritkund, a Sanskrit hatha yoga text, was translated into Persian and Arabic, and Chishti and Shattari Sufis used its practices. So options (a), (b) and (d) are wrong. Concept: the Naths were influential in north India, and Gorakhpur is named after Gorakhnath. Kabir and other saints debated with the yogis. The Hathayoga Pradipika of Swatmarama is a classic text. This exchange shows the cultural mixing of the medieval period.

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Option (c) is the statement that is not a feature of the iqta system, so it is the answer: revenue from an iqta was not deposited directly in the Sultan's account. The muqti, or iqtadar, collected the revenue, paid himself and maintained troops for the Sultan, and sent only the surplus, called fawazil, to the treasury. Option (a) is correct: the iqta was a revenue assignment. Option (b) is correct: Nizam-ul-Mulk Tusi's Siyasatnama describes the iqta system. Option (d) is correct: the muqti had to keep troops from the revenue. Concept: Iltutmish set up the iqta system in India. Balban and Alauddin Khalji tightened control over iqtas, while Firoz Shah Tughlaq made them hereditary. It was the forerunner of the Mughal jagir.

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Option (c) is the incorrect pair, so it is the answer: the Tughlaqnama, about Ghiyasuddin Tughlaq's rise to the throne, was written by Amir Khusrau, not by Ibn Battuta. Ibn Battuta, the Moroccan traveller who served Muhammad bin Tughlaq, wrote the Rehla. Option (a) is correct: Minhaj-us-Siraj Juzjani wrote the Tabaqat-i-Nasiri, dedicated to Sultan Nasiruddin Mahmud. Option (b) is correct: Shams-i-Siraj Afif wrote a Tarikh-i-Firozshahi; Ziauddin Barani wrote another work with the same name. Option (d) is correct: Gulbadan Begum, Humayun's sister, wrote the Humayunnama. Concept: Amir Khusrau also wrote Khazain-ul-Futuh and Nuh Sipihr. Two books named Tarikh-i-Firozshahi, by Barani and Afif, are a frequent trap.

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Option (b) is right: the Native Marriage Act, Act III of 1872, was passed after the campaign of Keshab Chandra Sen of the Brahmo Samaj. It allowed civil marriages for people who did not profess a recognised religion, permitted inter-caste marriages, banned polygamy, and set minimum ages of 14 for brides and 18 for grooms. Options (a) 1870, (c) 1874 and (d) 1876 are wrong. Concept: the Act was also called the Brahmo Marriage Act. Keshab Chandra Sen later married his own minor daughter to the Maharaja of Cooch Behar in 1878, breaking the Act, which caused a split and the formation of the Sadharan Brahmo Samaj. Later social laws include the Age of Consent Act of 1891 and the Sarda Act of 1929.

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Option (b) is right: A-2, B-3, C-1, D-4. The Pabna agrarian leagues fought zamindars over rent increases in 1873-85. The Eka, or unity, movement of peasants in Awadh took place in 1921-22, led by Madari Pasi. The Santhal Hul under Sidhu and Kanhu took place in 1855-56. The Tana Bhagat movement of the Oraons in Chotanagpur began in 1914 under Jatra Bhagat. Options (a), (c) and (d) mismatch these. Concept: the Pabna revolt was peaceful and legal, and it led to the Bengal Tenancy Act of 1885. The Eka movement was centred on Hardoi, Bahraich and Sitapur in Uttar Pradesh. Tana Bhagats later joined the Gandhian movement and wore khadi.

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Option (d) is the incorrect pair, so it is the answer: Ramsay MacDonald announced the Communal Award in August 1932, not 1933. It gave separate electorates to minorities and also to the depressed classes. Option (a) is correct: the Indian Navy (Discipline) Act came in 1927. Option (b) is correct: the Civil Disobedience Movement began with the Dandi March in 1930. Option (c) is correct: the Second Round Table Conference met in London in September-December 1931, with Gandhi attending as the sole Congress representative. Concept: Gandhi began a fast unto death in Yerwada jail against separate electorates for the depressed classes, which led to the Poona Pact with Ambedkar in September 1932, replacing separate electorates with reserved seats.

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Option (a) is right: the order is IV, II, I, III. Pherozeshah Mehta, the moderate leader who founded the Bombay Presidency Association and the Bombay Chronicle, died in November 1915. The Jallianwala Bagh massacre took place on 13 April 1919 at Amritsar. The Simon Commission was appointed in November 1927. Gandhi's Dandi March began on 12 March 1930. Options (b), (c) and (d) place these events out of sequence. Concept: chronology questions are easiest when you fix anchor dates. The Simon Commission had no Indian member, so it was boycotted with the slogan Simon Go Back. The Dandi March reached Dandi on 6 April 1930, when Gandhi broke the salt law.

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Option (a) is right: the first INA trial, of Shah Nawaz Khan, Prem Kumar Sahgal and Gurbaksh Singh Dhillon, was held at the Red Fort in Delhi from November 1945. Option (b), Gwalior Fort, option (c), Amer Fort, and option (d), Agra Fort, were not the venue. Concept: the three officers, a Muslim, a Hindu and a Sikh, became symbols of national unity. Bhulabhai Desai led the defence, with Jawaharlal Nehru, Tej Bahadur Sapru and Asaf Ali among the counsel. They were convicted, but the sentences were remitted because of the huge public protest. The Red Fort was chosen because of its symbolic link with Bahadur Shah Zafar's trial after 1857. The trials helped spark the Royal Indian Navy revolt of 1946.

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Option (b) is right: both statements are true, but R does not explain A. A is true: William Jones founded the Asiatic Society in Calcutta in January 1784, during Warren Hastings' time as Governor-General, and Hastings declined its presidency in favour of Jones. R is true: Hastings was a patron of oriental learning who knew Persian, founded the Calcutta Madrasa in 1781 and sponsored Charles Wilkins' translation of the Gita. But his orientalism explains his patronage, not his declining the post, which was a personal courtesy, so (a) is wrong. Options (c) and (d) are wrong. Concept: Jones translated Kalidasa's Abhijnanashakuntalam and noted the link between Sanskrit, Greek and Latin. Jonathan Duncan founded the Sanskrit College at Banaras in 1791.

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Option (a) is right: the 43rd session of UNESCO's World Heritage Committee met in Baku, Azerbaijan, in July 2019 and inscribed the walled city of Jaipur on the World Heritage List. Option (b), Bishkek, option (c), Istanbul, and option (d), Marrakesh, did not host that session; Istanbul hosted the 40th session in 2016. Concept: Jaipur was founded in 1727 by Sawai Jai Singh II and planned on a grid in line with Vastu ideas; it is called the Pink City. India now has 45 World Heritage sites, the latest being the Ancient Buddhist Site of Sarnath in 2026. India hosted the 46th session in New Delhi in July 2024. Ahmedabad, in 2017, was India's first World Heritage City.

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Option (b) is right: the Central Institute of Indian Languages is in Mysuru, Karnataka. It was set up in 1969 under the Ministry of Education to develop Indian languages, including tribal and endangered ones, and runs regional language centres for teaching. Option (a), Varanasi, has the Central Institute of Higher Tibetan Studies at Sarnath. Option (c), New Delhi, has the Central Hindi Directorate. Option (d), Shimla, has the Indian Institute of Advanced Study. Concept: the Central Institute of Classical Tamil is in Chennai, and the Kendriya Hindi Sansthan is in Agra. In 2024 Marathi, Pali, Prakrit, Assamese and Bengali were declared classical languages, raising the number to eleven. Mysuru also has the All India Institute of Speech and Hearing.

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Option (d) is the incorrect pair, so it is the answer: a jarib was not a tax; it was the measuring chain or rod used in Mughal land surveys. Akbar replaced the rope, which shrank and stretched, with bamboo pieces joined by iron rings. Option (a) is correct: the dam was a copper coin. Option (b) is correct: the desai was a hereditary revenue official in western India, like the deshmukh. Option (c) is correct: the diwan was the head of revenue in a province, the subah. Concept: Todar Mal's zabt or dahsala system measured land and fixed revenue on average produce and prices of ten years. Other Mughal terms include the bigha, a unit of area, and the amalguzar, the revenue collector at the district level.

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Option (b) is right: A-1, B-3, C-4, D-2. Mulla Daud wrote the Chandayan in 1379, an Awadhi Sufi romance and the earliest premakhyan. Damodar Kavi wrote the Lakhansen-Padmavati Katha. Somanatha wrote the Raga Vibodha in 1609, a music treatise. Amir Khusrau wrote Ashiqa, a masnavi on the love of Deval Rani and Khizr Khan. Options (a), (c) and (d) mismatch these. Concept: medieval literature saw a rich Indo-Persian exchange. Malik Muhammad Jayasi's Padmavat of 1540 is a famous Sufi romance on Rani Padmini. Amir Khusrau, a disciple of Nizamuddin Auliya, also wrote Qiran-us-Sadain, Nuh Sipihr and Tughlaqnama, and is credited with qawwali.

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Option (a) is right: before joining Akbar's court, Tansen was patronised by Raja Ramchandra Singh Baghela of Bandhavgarh, in the Rewa or Bhatha state. Akbar asked for him in 1562 and made him one of the nine gems, the navaratnas, of his court. Option (b), Baz Bahadur of Malwa, was himself a famous musician known for his romance with Rupmati, but he was not Tansen's patron. Option (c), Uday Singh of Mewar, and option (d), Muzaffar Shah of Gujarat, did not patronise him. Concept: Tansen trained under Swami Haridas and at the court of Raja Mansingh Tomar's tradition in Gwalior, where his tomb stands and the Tansen Samaroh is held. Ragas such as Darbari Kanada and Miyan ki Malhar are credited to him.

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Option (b) is right: A-2, B-3, C-4, D-1. The Pallavas ruled from Kanchipuram, the Pandyas from Madurai, the Yadavas or Seunas from Devagiri, and the Kakatiyas from Warangal, also called Orugallu. Options (a), (c) and (d) mismatch these dynasties and capitals. Concept: Alauddin Khalji's general Malik Kafur attacked the Yadavas of Devagiri, the Kakatiyas of Warangal, and the Pandyas of Madurai in the early 14th century. Muhammad bin Tughlaq later shifted his capital to Devagiri and renamed it Daulatabad. The Kakatiya queen Rudramadevi was praised by Marco Polo. The Kakatiya Rudreshwara or Ramappa temple is a UNESCO World Heritage site, inscribed in 2021.

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Option (b) is right: the order is IV, II, III, I. The Atala Masjid in Jaunpur was completed in 1408 under the Sharqi rulers. Sher Shah Suri's tomb at Sasaram was completed in 1545. Humayun's tomb in Delhi was finished around 1570, built by his widow Haji Begum. Rabia-ud-Daurani's tomb at Aurangabad, the Bibi ka Maqbara, was built around 1660 by Aurangzeb's son Azam Shah. Options (a), (c) and (d) place these out of sequence. Concept: Humayun's tomb was the first garden tomb in India and inspired the Taj Mahal. The Bibi ka Maqbara is called the Taj of the Deccan. Sher Shah's tomb stands in the middle of a lake. Humayun's tomb is a UNESCO World Heritage site.

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Option (a) is right: only statement 1 is correct. Statement 1 is correct: Akbar set up the mansabdari system around 1573-77, ranking every noble and officer by zat, personal rank, and sawar, the number of horsemen to maintain; it formed the official nobility of the state. Statement 2 is wrong: a mansab was not hereditary; the emperor granted it and could raise, lower or withdraw it, and a mansabdar's property went back to the state on death, a practice called escheat. So options (b), (c) and (d) are wrong. Concept: mansabdars were paid in cash, called naqdi, or by jagirs, assignments of revenue. Jahangir added the du-aspa sih-aspa rank. The jagirdari crisis under Aurangzeb weakened the empire.

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Option (c) is right: A-4, B-2, C-1, D-3. The Treaty of Allahabad of 1765 gave the East India Company the diwani of Bengal, Bihar and Orissa. The Treaty of Mangalore of 1784 ended the Second Anglo-Mysore War. The Treaty of Salbai of 1782 ended the First Anglo-Maratha War. The Treaty of Madras of 1769 ended the First Anglo-Mysore War, dictated by Hyder Ali. Options (a), (b) and (d) mismatch these years. Concept: other treaties to remember are Seringapatam in 1792, ending the Third Anglo-Mysore War; Bassein in 1802, by which the Peshwa accepted subsidiary alliance; Amritsar in 1809 with Ranjit Singh; and Lahore in 1846, after the First Anglo-Sikh War.

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Option (c) is right: the order is IV, II, I, III. The Civil Disobedience Movement began with the Dandi March in March 1930. The Gandhi-Irwin Pact was signed in March 1931, suspending the movement, and Gandhi then attended the Second Round Table Conference. The Poona Pact between Gandhi and Ambedkar was signed in September 1932, after the Communal Award. The Cripps Mission came in March 1942. Options (a), (b) and (d) place these out of order. Concept: the Cripps Mission offered dominion status after the war and the right of provinces to opt out, which Gandhi called a post-dated cheque. Its failure led to the Quit India Movement in August 1942. The Civil Disobedience Movement was revived in 1932 and withdrawn in 1934.

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Option (b) is right: both statements are correct. Statement 1: Lord Curzon decided to rearrange provincial boundaries; his partition of Bengal took effect on 16 October 1905, on the plea of administrative convenience. Statement 2: it created a new province, Eastern Bengal and Assam, with Dacca as its capital. So options (a), (c) and (d) are wrong. Concept: the real aim was seen as dividing Bengali nationalists along religious lines. It sparked the Swadeshi and Boycott Movement, and 16 October was observed as a day of mourning, when Rabindranath Tagore led the Raksha Bandhan rallies and Amar Sonar Bangla was sung. The partition was annulled in 1911 at the Delhi Durbar, and the capital moved from Calcutta to Delhi.

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Option (b) is right: C. Rajagopalachari prepared the C.R. Formula in 1944 to end the deadlock between the Muslim League and the Congress. It proposed that the League back the demand for independence, and that after the war a plebiscite be held in Muslim-majority areas on separation, with common defence and communications. Option (a), Nehru, option (c), Chittaranjan Das, and option (d), V.P. Menon, were not its authors; C.R. Das died in 1925 and V.P. Menon drafted the Mountbatten Plan. Concept: the Gandhi-Jinnah talks on the formula in September 1944 failed, as Jinnah wanted the full Pakistan demand. Rajagopalachari later became the first and only Indian Governor-General, in 1948, and founded the Swatantra Party in 1959.

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Option (d) is right: The Rise and Growth of Economic Nationalism in India (1966) was written by Bipan Chandra. It studies the economic ideas of early nationalist leaders such as Dadabhai Naoroji, M.G. Ranade, G.K. Gokhale and R.C. Dutt, including the drain theory. Option (a), Partha Sarathi Gupta, wrote on British imperialism and labour. Option (b), Sarvepalli Gopal, wrote a major biography of Nehru. Option (c), B.R. Nanda, wrote biographies of Gandhi and of Gokhale. Concept: Dadabhai Naoroji's Poverty and Un-British Rule in India of 1901 put forward the drain theory, and R.C. Dutt wrote The Economic History of India. Bipan Chandra also wrote India's Struggle for Independence with others.

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Option (a) is right: the Markandeshwar, or Markandadeo, temple group on the Wainganga river in Gadchiroli district of Maharashtra is called the Khajuraho of Vidarbha, because of its richly carved Nagara-style temples, dating to around the 9th to 12th centuries. Option (b), the Kailasa temple, is the rock-cut temple at Ellora built under the Rashtrakuta king Krishna I. Option (c), Manudevi, is a temple in the Satpura hills near Jalgaon. Option (d), Bhimashankar, near Pune, is one of the twelve jyotirlingas. Concept: other temples called mini-Khajuraho include Bhoramdeo in Chhattisgarh, known as the Khajuraho of Chhattisgarh. The real Khajuraho temples were built by the Chandelas and are a UNESCO World Heritage site.

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Option (c) is right: venu means bamboo, and Venushilpa, by the Patna-based artist and designer Upendra Maharathi, relates to bamboo art and crafts. Option (a), jewellery, option (b), painting, and option (d), marble carving, are not its subject, although Maharathi was also a painter. Concept: Upendra Maharathi, called Chitracharya, set up the Institute of Industrial Design in Patna, which promoted bamboo and other crafts in Bihar; the Upendra Maharathi Shilp Anusandhan Sansthan in Patna is named after him. Bihar is famous for Madhubani or Mithila painting, Sikki grass craft and Sujani embroidery. Bamboo is a grass, and in 2017 the Indian Forest Act was amended so that bamboo grown outside forests is not treated as a tree.

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Option (a) is right: on 10 September 2019, Prime Minister Modi and Nepal's Prime Minister K.P. Sharma Oli jointly opened by video link the 69-km Motihari-Amlekhganj petroleum products pipeline, from Motihari in Bihar to Amlekhganj in Nepal. It was South Asia's first cross-border oil pipeline, built by Indian Oil. Option (b), Darbhanga, and option (c), Kathmandu, are not its ends. Option (d) is wrong because (a) is correct. Concept: the pipeline replaced costly tanker transport of fuel to Nepal and cut prices. India also built the India-Bangladesh Friendship Pipeline, from Siliguri to Parbatipur, opened in 2023. Proposals exist to extend the Nepal pipeline. Such links are part of India's Neighbourhood First policy.

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Option (a) is right: the Bulgarian economist Kristalina Georgieva became Managing Director of the International Monetary Fund on 1 October 2019, the first from an emerging economy. She was earlier CEO of the World Bank. Option (b), Christine Lagarde, was her predecessor and left to head the European Central Bank. Option (c), Raghuram Rajan, was IMF Chief Economist and RBI Governor. Option (d), Surjit Bhalla, was India's Executive Director at the IMF from 2019. Concept: by convention the IMF head is a European and the World Bank president an American. Georgieva began a second five-year term in October 2024. Gita Gopinath became the IMF's first woman Chief Economist in 2019 and later First Deputy Managing Director.

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Option (d) is right: A-4, B-3, C-1, D-2. Thomas Cook was the British tour and travel company that collapsed in September 2019. Greta Thunberg is the Swedish climate activist who began school strikes for climate in 2018. Dr Usha Kiran Khan, the Hindi and Maithili writer, received the Uttar Pradesh Hindi Sansthan's Bharat Bharati Samman. Carrie Lam was Hong Kong's Chief Executive from 2017 to 2022, during the 2019 protests against an extradition bill. Options (a), (b) and (c) mismatch these. Concept: Thomas Cook's brand in India survived separately as Thomas Cook India. Greta Thunberg addressed the UN Climate Action Summit in 2019. John Lee succeeded Carrie Lam in Hong Kong in 2022.

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Option (d) is right: Elinor Ostrom was the first woman to win the Nobel Memorial Prize in Economic Sciences, in 2009, sharing it with Oliver Williamson for her work on how communities govern common resources. Option (a), Esther Duflo, was the second woman, in 2019, with Abhijit Banerjee and Michael Kremer for experimental approaches to fighting poverty. Option (b), Gerty Cori, won the Nobel in Medicine in 1947. Option (c), Maria Goeppert Mayer, won the Nobel in Physics in 1963. Concept: Claudia Goldin became the third woman in 2023, and the first to win alone, for work on women's labour market outcomes. The economics prize is given by Sweden's central bank in Nobel's memory since 1969. Amartya Sen won in 1998.

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Option (c) is right: both statements are true. On 2 October 2019, Gandhi's 150th birth anniversary, a giant charkha made of about 1,250 kg of waste plastic was unveiled in Sector 94 of Noida, as part of the campaign against single-use plastic, and it was billed as the largest of its kind. So option (a), only 1, and option (b), only 2, are incomplete, and option (d) is wrong. Concept: the Prime Minister called for freedom from single-use plastic in 2019. India banned identified single-use plastic items from 1 July 2022 under the Plastic Waste Management Amendment Rules. The charkha is a symbol of Gandhi's swadeshi and self-reliance. The Noida Authority built it from plastic collected locally.

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Option (c) is right: the secretariat of the International Solar Alliance is at the National Institute of Solar Energy campus at Gwal Pahari, Gurugram, in Haryana. Option (a), Paris, is where India and France launched the alliance at COP21 in 2015. Option (b), New Delhi, is nearby but not the location. Option (d), New York, is the UN headquarters. Concept: the ISA was the first treaty-based international body to have its headquarters in India; its framework agreement came into force in 2017. Membership was opened to all UN members in 2020. Its initiatives include One Sun One World One Grid, launched in 2021. The ISA aims to mobilise investment in solar energy, especially in sunshine countries between the tropics.

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Option (b) is right: A-1, B-4, C-2, D-3. Hurricane Dorian devastated the Bahamas in early September 2019. Typhoon Hagibis hit Japan on 12 October 2019, one of its strongest storms in decades, and disrupted the Rugby World Cup. Typhoon Lekima struck eastern China, in Zhejiang, in August 2019. Typhoon Mitag hit South Korea, including Jeju, in early October 2019. Options (a), (c) and (d) mismatch these. Concept: Hagibis and Mitag actually struck in October, just outside the period named in the question. Tropical cyclones are called hurricanes in the Atlantic and typhoons in the western Pacific. Regional bodies name them from rotating lists, and very destructive names are retired.

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Option (d) is right: during Vice-President M. Venkaiah Naidu's visit to Sierra Leone in October 2019, India announced it would open a High Commission in Freetown, the capital. Option (a), Benin, option (b), the Gambia, and option (c), Guinea, were among African countries where India also planned missions, but the October 2019 announcement was for Sierra Leone. Concept: Commonwealth countries exchange High Commissions instead of embassies, which is why it is called a High Commission; Sierra Leone is a Commonwealth member. India planned 18 new missions in Africa from 2018 to 2021 to deepen ties. India hosted the India-Africa Forum Summits in 2008, 2011 and 2015, and the African Union became a permanent G20 member under India's presidency in 2023.

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Option (d) is right: Karnataka topped NITI Aayog's first India Innovation Index, released in October 2019, among the major states, followed by Tamil Nadu, Maharashtra, Telangana and Haryana. Option (a), Tamil Nadu, was second. Option (b), Maharashtra, was third. Option (c), Haryana, was fifth. Concept: the index was prepared by NITI Aayog with the Institute for Competitiveness, based on the Global Innovation Index framework. It measures enablers, such as human capital, investment and business environment, and performance, such as knowledge output. Karnataka, home to Bengaluru, has kept the top spot in later editions. In the Global Innovation Index of WIPO, India entered the top 40 in 2022.

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Option (d) is right: Girl, Woman, Other was written by the British writer Bernardine Evaristo, who shared the 2019 Booker Prize with Margaret Atwood. She was the first Black woman to win the Booker. Option (a), Margaret Atwood, won the shared prize for The Testaments, the sequel to The Handmaid's Tale. Option (b), Elif Shafak, was shortlisted for 10 Minutes 38 Seconds in This Strange World. Option (c), Salman Rushdie, was shortlisted for Quichotte; he won in 1981 for Midnight's Children. Concept: the Booker rules forbid splitting the prize, but the judges did so in 2019, as in 1974 and 1992. The International Booker went to Geetanjali Shree's Tomb of Sand in 2022 and Banu Mushtaq's Heart Lamp in 2025.

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Option (c) is right: at the 2019 BWF World Championships in Basel, Switzerland, P.V. Sindhu beat Japan's Nozomi Okuhara 21-7, 21-7 in the final. It was India's first world title in badminton and avenged her loss to Okuhara in the 2017 final. Option (a), Carolina Marin of Spain, beat Sindhu in the 2016 Rio Olympic final and the 2018 world final. Option (b), Tai Tzu Ying of Chinese Taipei, beat her in the 2020 Tokyo Olympic semi-final. Option (d) is wrong because (c) is correct. Concept: Sindhu won silver at Rio 2016 and bronze at Tokyo 2020, becoming the first Indian woman with two individual Olympic medals. Saina Nehwal won India's first Olympic badminton medal, bronze at London 2012.

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Option (d) is right: in August 2019 Prime Minister Modi and Bhutan's Prime Minister Lotay Tshering jointly inaugurated the 720 MW Mangdechhu hydroelectric project in Trongsa, Bhutan, built with Indian help. Option (a), Chhukha (336 MW), is an older India-assisted project from the 1980s. Option (b), Dagachhu, was built with other partners and finished in 2015. Option (c), Kurichhu (60 MW), is another older India-assisted project. Concept: hydropower is the main pillar of India-Bhutan ties; India buys surplus power from Bhutan. Other India-assisted projects include Tala (1,020 MW) and Punatsangchhu. The 1,020 MW Punatsangchhu-II project was inaugurated in November 2025. India's RuPay card was also launched in Bhutan during the 2019 visit.

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Option (c) is right: the para athlete Deepa Malik won silver in shot put, in the F53 class, at the 2016 Rio Paralympics, the first Indian woman to win a Paralympic medal, and received the Rajiv Gandhi Khel Ratna in 2019, sharing it with wrestler Bajrang Punia. Option (a), badminton, and option (d), weightlifting, are wrong. Option (b), discus throw, is wrong as the main answer, although she has also competed in javelin and discus. Concept: Deepa Malik later became President of the Paralympic Committee of India. The Khel Ratna was renamed the Major Dhyan Chand Khel Ratna in 2021. India won a record 29 medals at the Paris 2024 Paralympics. Avani Lekhara became the first Indian woman to win Paralympic gold, at Tokyo 2020.

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Option (d) is right: neither statement is correct. Statement 1 is wrong because India's national calendar is based on the Saka era, not the Vikram era; Chaitra is its first month and a normal year has 365 days. Statement 2 is wrong because it was adopted from 22 March 1957, equal to 1 Chaitra 1879 Saka, on the advice of the Calendar Reform Committee headed by Meghnad Saha, not from 26 January 1950. So options (a), (b) and (c) are wrong. Concept: the Saka era began in 78 CE, often linked with the Kushana king Kanishka, while the Vikram Samvat began in 57 BCE. The national calendar is used with the Gregorian calendar in the Gazette, news broadcasts and government documents.

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Option (c) is right: in 1976 the accounts of the Union government were departmentalised. The CAG (Duties, Powers and Conditions of Service) Amendment Act relieved the CAG of compiling Union accounts, which passed to the ministries under the Controller General of Accounts, and the CAG kept only the audit. Option (a), 1975, option (b), 1977, and option (d), 1981, are wrong. Concept: the CAG, under Article 148, is called the guardian of the public purse. Its reports on Union accounts go to the President, who lays them before Parliament, where the Public Accounts Committee examines them. The CAG still compiles the accounts of most state governments. The CAG's duties come from the 1971 Act.

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Option (b) is right: both statements are true, but R does not explain A. A is true: the Constitution, including Article 30, nowhere defines the word minority. R is true: Articles 29 and 30 recognise only minorities based on religion or language, giving them the right to set up and run educational institutions of their choice. But recognising two kinds of minority is a separate fact and does not explain why the word was left undefined, so (a) is wrong. Options (c) and (d) are wrong because both are true. Concept: the Supreme Court held in the T.M.A. Pai case of 2002 that minority status is decided state-wise. The National Commission for Minorities Act of 1992 lists six notified religious minorities: Muslims, Christians, Sikhs, Buddhists, Parsis and Jains.

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Option (a) is right: only statement 1 is correct. Statement 1 is correct because India is called an indestructible union of destructible states; no state has a right to secede, though Parliament can alter state boundaries under Article 3. Statement 2 is wrong because the 16th Amendment of 1963 let the State impose reasonable restrictions on free speech in the interest of the sovereignty and integrity of India, so advocating secession is not protected; it is an offence under the Unlawful Activities (Prevention) Act. So options (b), (c) and (d) are wrong. Concept: the 16th Amendment followed the DMK's demand for a separate Dravida Nadu. Candidates and legislators also swear to uphold the sovereignty and integrity of India. The USA, by contrast, is an indestructible union of indestructible states.

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Option (c) is the incorrect pair, so it is the answer: seats in the Council of States, the Rajya Sabha, are allotted to the states and Union Territories in the Fourth Schedule, not the Second Schedule. The Second Schedule covers the pay and allowances of the President, Governors, Speakers, judges and the CAG. Option (a) is correct: public health and sanitation is entry 6 of the State List. Option (b) is correct: the census is entry 69 of the Union List. Option (d) is correct: anti-defection provisions are in the Tenth Schedule, added by the 52nd Amendment of 1985. Concept: other schedules to remember are the First (states and UTs), the Third (oaths), the Seventh (lists), the Eighth (languages) and the Ninth (protected laws). Uttar Pradesh has the most Rajya Sabha seats, 31.

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Option (c) is right: the Eleventh Schedule, added by the 73rd Amendment of 1992, lists 29 subjects that may be given to panchayats, including agriculture, minor irrigation, drinking water, rural housing, poverty alleviation and primary education. Option (a), 22, option (b), 24, and option (d), 32, are wrong. Concept: the Twelfth Schedule, added by the 74th Amendment, lists 18 subjects for municipalities, such as urban planning, water supply, public health and fire services. Mixing up 29 and 18 is a common error. The 73rd Amendment also created three tiers, one-third reservation for women, State Election Commissions and State Finance Commissions. How many subjects actually pass to panchayats depends on each state.

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Option (c) is right: only statement 1 is correct. Statement 1 is correct because the Prime Minister's Secretariat, set up in 1947, was renamed the Prime Minister's Office in June 1977 under Morarji Desai. Statement 2 is wrong because the PMO is headed by the Principal Secretary to the Prime Minister, not the Cabinet Secretary; the Cabinet Secretary heads the Cabinet Secretariat and is the senior-most civil servant. So options (a), (b) and (d) are wrong. Concept: the PMO is not a constitutional body; it helps the Prime Minister run the government and coordinates ministries. The Cabinet Secretariat works under the Prime Minister and services the Cabinet and its committees. The Allocation of Business Rules of 1961 shape how ministries work.

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Option (a) is right: the Sixth Schedule applies to tribal areas in four states, Assam, Meghalaya, Tripura and Mizoram, where autonomous district councils make laws and manage land, forests and customs. Option (b), Sikkim, has special provisions under Article 371F instead. Option (c), Nagaland, has special provisions under Article 371A, protecting Naga customary law and land, not the Sixth Schedule. Option (d) is wrong because only Tripura applies. Concept: the Fifth Schedule covers scheduled areas in other states, such as Jharkhand, Odisha and Madhya Pradesh, through Tribes Advisory Councils. The Sixth Schedule came from the Bordoloi Committee. Ladakh has demanded Sixth Schedule status, and in 2025 protests there grew over this demand.

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Option (c) is the incorrect pair, so it is the answer: to be certified, or to be informed, is the meaning of certiorari, not prohibition. Prohibition means to forbid; it stops a lower court or tribunal from going beyond its jurisdiction. Option (a) is correct: habeas corpus means to have the body of, and it protects against unlawful detention. Option (b) is correct: mandamus means we command, ordering a public official to do a duty. Option (d) is correct: quo warranto means by what authority, used to test a person's claim to a public office. Concept: the Supreme Court issues writs under Article 32 and High Courts under Article 226, and High Courts' writ power is wider. Prohibition is issued before a decision, and certiorari after it, to quash it.

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Option (b) is right: Article 110 defines a Money Bill and says the Speaker's decision on whether a Bill is a Money Bill is final. Option (a), Article 109, sets the special procedure: a Money Bill can be introduced only in the Lok Sabha, and the Rajya Sabha can only make recommendations within 14 days. Option (c), Article 111, covers the President's assent to Bills. Option (d), Article 112, covers the annual financial statement, the budget. Concept: a Money Bill deals only with matters such as taxes, borrowing and the Consolidated Fund. Financial Bills are covered under Article 117. The President cannot return a Money Bill for reconsideration. Use of the Money Bill route for the Aadhaar Act was challenged in court.

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Option (c) is right: the Ministry of Human Resource Development launched DHRUV, the Pradhan Mantri Innovative Learning Programme, at ISRO's headquarters in Bengaluru on 10 October 2019. It brings gifted students to mentoring by experts in science, mathematics and the performing arts. Option (a), LAKSHYA, option (b), PRATIBHA, and option (d), PARIVARTAN, are not this programme. Concept: in the first batch, 60 students from classes 9 to 12 were selected. The programme aimed to help talented children reach their full potential and contribute to society. It fits with the idea of identifying and nurturing gifted students later stressed in the National Education Policy 2020. Other student schemes include INSPIRE for science and the Atal Tinkering Labs.

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Option (b) is right: the Department of Drinking Water and Sanitation under the Ministry of Jal Shakti released a ten-year Rural Sanitation Strategy for 2019-2029 in September 2019. It aims to keep villages open-defecation free and move to ODF Plus, adding solid and liquid waste management. Option (a), 2019-2035, option (c), 2019-2022, and option (d), 2019-2024, give the wrong period. Concept: Swachh Bharat Mission (Grameen) was launched on 2 October 2014, and rural India was declared open-defecation free on 2 October 2019. Phase II, from 2020-21 to 2024-25, focused on ODF Plus. The Jal Shakti Ministry was formed in 2019 by merging water ministries, and runs the Jal Jeevan Mission for tap water.

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Option (b) is right: under the Registration of Births and Deaths Act, 1969, births and deaths must be reported to the registrar within 21 days. Option (a), 15 days, option (c), 26 days, and option (d), 30 days, are wrong. Later registration is allowed with a late fee and extra formalities, such as an affidavit or a magistrate's order after a year. Concept: the Registrar General of India coordinates the Civil Registration System, and the states' Chief Registrars carry it out. The Registration of Births and Deaths (Amendment) Act of 2023 created national and state databases, and from October 2023 a digital birth certificate is the single document to prove date of birth for admissions, jobs and other services.

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Option (b) is right: PAHAL, the direct benefit transfer for LPG, was entered in the Guinness World Records in 2015 as the world's largest direct cash transfer programme. Under it, the LPG subsidy is paid straight into consumers' bank accounts, and cylinders are sold at market price. Option (a), MGNREGA, is the largest rural employment programme, not this record. Option (c), the National Social Assistance Programme, gives pensions to the elderly, widows and disabled. Option (d) is wrong because (b) is correct. Concept: PAHAL began in 2013 and was relaunched in 2015, and it removed duplicate and fake connections. It was followed by the Give It Up campaign and the Pradhan Mantri Ujjwala Yojana of 2016, giving free LPG connections to poor women.

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Option (c) is right: provisions for protecting and improving the environment and safeguarding forests and wildlife are found both in the Directive Principles and in the Fundamental Duties. The 42nd Amendment of 1976 added Article 48A, a Directive Principle asking the State to protect and improve the environment and safeguard forests and wildlife. It also added Article 51A(g), a Fundamental Duty of citizens to protect and improve the natural environment, including forests, lakes, rivers and wildlife, and to have compassion for living creatures. So options (a), (b) and (d) are wrong. Concept: the same amendment moved forests and wildlife protection from the State List to the Concurrent List. Courts have read the right to a clean environment into Article 21.

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Option (d) is right: only statement 3 is correct. Statement 1 is wrong: Article 243D reserves at least one-third, not half, of the seats for SC and ST women among those reserved for them; 50 per cent is a choice many states have made. Statement 2 is wrong: under Article 243(b), the Gram Sabha consists of persons registered on the electoral rolls of the village, not all persons living there. Statement 3 is correct: Article 243B provides panchayats at the village, intermediate and district levels, though states with a population under 20 lakh may skip the intermediate level. So options (a), (b) and (c) are wrong. Concept: the 73rd Amendment of 1992 gave panchayats constitutional status. 24 April is National Panchayati Raj Day.

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Option (b) is right: the Mazdoor Kisan Shakti Sangathan is chiefly associated with the Right to Information Act, 2005. Founded in 1990 in Rajasthan by Aruna Roy, Nikhil Dey and Shankar Singh, it held public hearings, called jan sunwai, on village accounts and campaigned for access to government records. Option (a), the Right to Education Act, came from other campaigns. Option (c), MGNREGA, also had MKSS support, but its main identity is the RTI movement. Option (d), the National Health Mission, is not linked to it. Concept: Rajasthan passed its own RTI law in 2000, before the central Act. The RTI Act lets citizens seek information within 30 days, or 48 hours where life or liberty is at stake. Aruna Roy won the Magsaysay Award in 2000.

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Option (c) is right: the Mahila Kisan Sashaktikaran Pariyojana is not part of the National Social Assistance Programme. It is a sub-scheme of the Deendayal Antyodaya Yojana-National Rural Livelihoods Mission that trains and supports women farmers. Option (a), the National Family Benefit Scheme, is part of NSAP; it gives a lump sum to a poor household on the death of its main earner. Option (b), Annapurna, is also part of NSAP; it gives 10 kg of free foodgrains a month to needy elderly people not getting a pension. Option (d) is wrong because only (c) is outside NSAP. Concept: NSAP was launched on 15 August 1995 under Article 41. Its other parts are the Indira Gandhi National Old Age, Widow and Disability Pension Schemes. It is run by the Ministry of Rural Development.

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Option (d) is right: K.C. Wheare described India as quasi-federal, a unitary state with subsidiary federal features rather than a federal state with subsidiary unitary features. Option (a), Lord Bryce, wrote on democracy and the American Commonwealth. Option (b), Ivor Jennings, called India a federation with a strong centralising tendency. Option (c), H.J. Laski, was a political theorist, not the source of this phrase. Concept: other descriptions include bargaining federalism by Morris Jones, cooperative federalism by Granville Austin, and a federation sui generis. The Constitution calls India a Union of States in Article 1. Unitary features include a strong Centre, single citizenship, all-India services and emergency powers. The Supreme Court held in S.R. Bommai that federalism is a basic feature.

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Option (c) is right: the order is I, II, III, IV. Maharaja Hari Singh signed the Instrument of Accession on 26 October 1947. The Constitution of India came into force on 26 January 1950. The Constituent Assembly of Jammu and Kashmir ratified the accession in February 1954. The new Constitution of the State of Jammu and Kashmir came into force on 26 January 1957. Options (a), (b) and (d) place these out of order. Concept: Article 370 gave Jammu and Kashmir special status. On 5 August 2019 the Presidential Order made all provisions of the Constitution apply, and the Reorganisation Act split it into the Union Territories of Jammu and Kashmir and Ladakh from 31 October 2019. The Supreme Court upheld this in December 2023.

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Option (a) is the official answer: the key treats both statements as true, with R explaining A, since the Supreme Court as guardian of the Constitution has the final say on the validity of central laws. R is clearly true: the Supreme Court is the guardian and final interpreter of the Constitution. Strictly, though, the power is not exclusive: Article 131A, added by the 42nd Amendment to give the Supreme Court exclusive power over central laws, was repealed by the 43rd Amendment of 1977, and High Courts can strike down central laws under Article 226. Options (b), (c) and (d) are not accepted by the key. Concept: judicial review is a basic feature of the Constitution, as held in Minerva Mills (1980) and L. Chandra Kumar (1997). Read such assertion questions with the key's broad view.

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Option (d) is right: National Panchayati Raj Day is observed on 24 April, the day the 73rd Constitutional Amendment Act came into force in 1993. Option (a), 26 January, is Republic Day. Option (b), 2 October, is Gandhi Jayanti; on that day in 1959 Nehru launched the first panchayati raj system at Nagaur in Rajasthan. Option (c), 21 April, is Civil Services Day. Concept: the 73rd Amendment added Part IX and the Eleventh Schedule. The Balwant Rai Mehta Committee of 1957 proposed the three-tier system, and the Ashok Mehta Committee of 1977 proposed two tiers. On Panchayati Raj Day the government gives national awards to panchayats. Local Self Government Day for municipalities is not fixed in the same way.

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Option (d) is right: Article 43A, added by the 42nd Amendment of 1976, asks the State to take steps to secure the participation of workers in the management of industries. Option (a), Article 38, asks the State to promote welfare and reduce inequalities; its clause on income inequality was added by the 44th Amendment. Option (b), Article 39A, on equal justice and free legal aid, was also added by the 42nd Amendment, but for a different purpose. Option (c), Article 45, now covers early childhood care up to age six, as changed by the 86th Amendment. Concept: the 42nd Amendment added four Directive Principles: Articles 39(f), 39A, 43A and 48A. It also added the Fundamental Duties in Part IVA and the words socialist, secular and integrity to the Preamble. Article 43B on cooperatives came in 2011.

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Option (b) is right: the Preamble is not enforceable in a court of law. It neither grants powers to any body nor limits them, and no one can go to court for its breach. Option (a), that it is enforceable, is wrong. Option (c), that it may be enforced in special circumstances, is wrong. Option (d) is wrong because (b) is correct. Concept: in the Berubari case of 1960 the Supreme Court said the Preamble was not part of the Constitution, but in Kesavananda Bharati (1973) it held that it is part of it and can be amended, without altering the basic structure. In LIC of India (1995) the Court again said it is part. It is used as a key to interpret unclear provisions and was amended once, by the 42nd Amendment.

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Option (d) is right: Article 162 is headed extent of executive power of State. It says the executive power of a state extends to matters on which the state legislature can make laws, but on Concurrent List matters it is subject to the Union's executive power. Option (a), the executive power of the state, is Article 154, which vests it in the Governor. Option (b), the conditions of the Governor's office, is Article 158. Option (c), the term of office of the Governor, is Article 156: five years, at the President's pleasure. Concept: the matching Union provision is Article 73, on the extent of the Union's executive power. Article 163 provides a Council of Ministers to aid and advise the Governor, and Article 164 covers the appointment of the Chief Minister.

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Option (c), NITI Aayog, is correct. NITI Aayog is the nodal body for overseeing and coordinating the Sustainable Development Goals in India. It maps the 17 goals and their targets to ministries and schemes and publishes the SDG India Index, first released in 2018. MoSPI develops the National Indicator Framework used to measure progress. The Planning Commission (a) was abolished in 2014 and replaced by NITI Aayog in 2015. The Disinvestment Commission (b) advised on selling government stakes in PSUs. The Finance Commission (d) is a constitutional body under Article 280 that shares taxes between the Centre and States. Concept: the SDGs (2015-2030) replaced the Millennium Development Goals.

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Option (c) is correct: A-2, B-1, C-4, D-3. The National Programme for Control of Blindness began in 1976 as a fully centrally sponsored scheme, aiming to cut blindness to 0.3%. ICDS was launched on 2 October 1975 to give nutrition, pre-school education and health services through anganwadis. The leprosy programme of 1955 became the National Leprosy Eradication Programme in 1983, with multi-drug therapy. The National Rural Health Mission began in April 2005 and in 2013 joined the urban mission under the National Health Mission. Option (a) gives NPCB 1975; (b) gives ICDS 1983; (d) reverses nearly every pair. Concept: India eliminated leprosy as a public health problem in 2005.

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Option (a) is right: Chandrayaan-2 was launched from Sriharikota on 22 July 2019 by GSLV Mk III-M1, the first operational flight of ISRO's heaviest rocket, now called LVM3. Option (b), GSLV Mk II, is a smaller rocket. Options (c) and (d), GSLV Mk IV and Mk V, do not exist. Concept: Chandrayaan-2 had an orbiter, the Vikram lander and the Pragyan rover; the lander crashed in September 2019, but the orbiter still works. Chandrayaan-3, also launched on LVM3, landed near the lunar south pole on 23 August 2023, now National Space Day. India became the fourth country to soft-land on the Moon and the first near its south pole. LVM3 also launched OneWeb satellites.

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Option (b) is right: the cockroach has white or colourless blood. Its blood, called haemolymph, has no haemoglobin, so it looks pale. In its open circulatory system the blood carries nutrients, while oxygen reaches tissues directly through tracheal tubes. Option (a), the lizard, is a vertebrate with red blood containing haemoglobin. Option (c), the house bug, or bed bug, appears red because it feeds on human blood. Option (d), the mosquito, also looks red when it has fed on blood. Concept: blood colour depends on the pigment: haemoglobin with iron gives red, haemocyanin with copper gives blue, as in crabs, octopus and snails. Insects use tracheae for breathing, so their blood does not need an oxygen-carrying pigment.

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Option (a) is right: nitrogen-fixing bacteria such as Rhizobium enter the roots of leguminous plants, the pulses such as gram, pea, lentil and soybean, and form root nodules where they fix atmospheric nitrogen into ammonia. Option (b), rice, option (c), wheat, and option (d), sugarcane, are not legumes and do not form such nodules. Rice fields do get nitrogen from blue-green algae and Azolla, but that is a separate association. Concept: the enzyme nitrogenase does the fixing, and leghaemoglobin in the nodules keeps oxygen low to protect it. Pulses in crop rotation enrich soil nitrogen. Biofertilisers include Rhizobium, Azotobacter, Azospirillum and blue-green algae. India is the world's largest producer and consumer of pulses.

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Option (a) is right: when a charge is placed on a soap bubble, its radius increases. The charge spreads over the surface, and like charges repel each other, creating an outward electrostatic pressure. This adds to the pressure of the air inside and works against surface tension, so the bubble expands. Option (b), a decrease in radius, would need an inward force, which charge does not give, whether positive or negative. Option (c), collapse, does not follow from charging. Option (d) is wrong because (a) is correct. Concept: the excess pressure inside a soap bubble is 4T divided by r, where T is surface tension, since it has two surfaces. Charge on a conductor always stays on its outer surface.

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Option (d) is the incorrect pair, so it is the answer: rayon is regenerated cellulose, made from wood pulp and called artificial silk; it is not modified starch. Option (a) is correct: oxytocin is a hormone made in the hypothalamus and released by the posterior pituitary; it causes contractions in childbirth and milk let-down. Option (b) is correct: aspartame is an artificial sweetener about 200 times sweeter than sugar. Option (c) is correct: neoprene, or polychloroprene, is a synthetic rubber resistant to oil and heat, used in wetsuits and gaskets. Concept: rayon is semi-synthetic, while nylon and polyester are fully synthetic. In 2023 the WHO's cancer agency classed aspartame as possibly carcinogenic, though the acceptable daily intake was kept.

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Option (a) is right: cotton is not a protein; cotton fibre is almost pure cellulose, a carbohydrate made of glucose units. Option (b), hair, and option (d), hoof, are made of keratin, a tough fibrous protein that also forms nails, horns and feathers. Option (c), spider silk, is made of proteins called spidroins, and it is stronger than steel of the same weight. So all except cotton are proteins. Concept: natural fibres from plants, such as cotton, jute and linen, are cellulose, while animal fibres, such as wool and silk, are proteins. This is why burning wool smells like burnt hair. Proteins are made of amino acids linked by peptide bonds, while cellulose has beta-glucose linked by glycosidic bonds.

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Option (c) is right: a thermos, or vacuum, flask prevents heat loss or gain by conduction, convection and radiation. The vacuum between its double walls stops conduction and convection, because both need a medium, and the silvered inner surfaces reflect radiation back. The stopper reduces loss through the neck. Option (a), conduction alone, and option (b), convection and radiation alone, are incomplete. Option (d) is wrong because (c) is correct. Concept: the vacuum flask was invented by James Dewar in 1892 and is also called the Dewar flask. Conduction needs contact between particles, convection needs a moving fluid, and radiation can cross a vacuum, which is why sunlight reaches the Earth.

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Option (c) is right: the pancreas works both as an exocrine and an endocrine gland. As an exocrine gland it sends pancreatic juice with enzymes such as trypsin, amylase and lipase through a duct into the duodenum. As an endocrine gland, its islets of Langerhans release insulin from beta cells and glucagon from alpha cells directly into the blood. Option (a), the adrenal gland, and option (d), the thyroid, are purely endocrine. Option (b), the lacrimal gland, which makes tears, is purely exocrine. Concept: exocrine glands use ducts, while endocrine glands are ductless and release hormones into the blood. Other mixed glands are the testes and ovaries, which release gametes and hormones. Lack of insulin causes diabetes mellitus.

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Option (c) is right: gypsum contains calcium; it is hydrated calcium sulphate, CaSO4.2H2O. Heating it gives plaster of Paris, used for casts and statues, and it is added to cement to slow its setting. Option (a), china clay or kaolinite, is a hydrated aluminium silicate used in ceramics and paper. Option (b), corundum, is aluminium oxide; its coloured forms are ruby and sapphire, and it is the second hardest natural mineral after diamond. Option (d), talc, is a hydrated magnesium silicate and the softest mineral, number one on the Mohs scale. Concept: gypsum is also used to reclaim alkaline, or sodic, soils. Rajasthan produces most of India's gypsum. Other calcium minerals include limestone, calcite, dolomite and fluorite.

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Option (a) is the incorrect pair, so it is the answer: silver bromide is light-sensitive and is used in photographic film and paper, not in artificial photosynthesis. Option (b) is correct: silver iodide is used for cloud seeding to cause artificial rain, because its crystal structure is like ice and helps water droplets freeze. Option (c) is correct as per the source: lithium salts, including lithium bicarbonate, were used for gout and rheumatism, though lithium is now mainly used for bipolar disorder. Option (d) is correct: milk of magnesia, magnesium hydroxide, is an antacid and laxative. Concept: in photography, light turns silver bromide into silver, forming the image. Cloud seeding needs suitable clouds with enough moisture to work.

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Option (c) is right: tulsi, or holy basil, gets its medicinal value from phenols and flavonoids, such as eugenol, rosmarinic acid, and flavonoids like orientin and vicenin. These have antioxidant, anti-inflammatory and antimicrobial effects. Option (a), inorganic acids, are not the active compounds of tulsi. Option (b), organic acids, are present in many plants but are not the main source of tulsi's medicinal effects. Option (d) is wrong because (c) is correct. Concept: the scientific name of tulsi is Ocimum sanctum, or Ocimum tenuiflorum. It is used in Ayurveda for coughs, colds and fever. Eugenol is also found in cloves, and it gives both a strong aroma. Other medicinal plants include neem, ashwagandha and turmeric, whose active compound is curcumin.

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Option (d) is the incorrect pair, so it is the answer: pasteurisation is linked to milk, not tea. Louis Pasteur's method heats a liquid such as milk to a set temperature for a set time, for example 63 degrees Celsius for 30 minutes or 72 degrees for 15 seconds, to kill harmful microbes without spoiling it. Option (a) is correct: desalination removes salt from sea water. Option (b) is correct: reverse osmosis gives potable, or drinking, water by pushing water through a semi-permeable membrane. Option (c) is correct: denaturation changes the structure of proteins, as when an egg is boiled. Concept: ultra-high temperature, or UHT, treatment heats milk to about 135 degrees for a few seconds and gives a longer shelf life. Pasteur also made vaccines for rabies and anthrax.

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Option (c) is right: Diu became the first Union Territory of India to meet all its daytime power needs from solar energy, through a 9 MW solar park and rooftop plants. Option (a), Andaman and Nicobar, still depends a lot on diesel power, though solar is growing there. Option (b), Chandigarh, has many rooftop solar plants but is not fully solar. Option (d), Puducherry, is not fully solar. Concept: Diu is now part of the merged Union Territory of Dadra and Nagar Haveli and Daman and Diu, formed in January 2020. Other solar milestones include Cochin airport, the world's first fully solar-powered airport, and Modhera in Gujarat, India's first solar village. The PM Surya Ghar scheme of 2024 supports rooftop solar for homes.

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Option (c) is right: NFHS-5 (2019-21) did not include HIV testing. HIV blood testing was carried out in NFHS-3 and NFHS-4; NFHS-5 only asked about HIV awareness and behaviour. Option (a), high blood pressure, and option (b), diabetes, were included, as NFHS-5 measured blood pressure and blood sugar for adults in the sample. Option (d), registration of death, was a new topic added in NFHS-5. Concept: the National Family Health Survey is conducted by the Ministry of Health and Family Welfare, with the International Institute for Population Sciences, Mumbai, as nodal agency. NFHS-5 found India's total fertility rate at 2.0, below replacement level, and a sex ratio of 1,020 women per 1,000 men. NFHS-6 field work was done in 2023-24.

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Option (a) is right: eating mainly polished rice causes beriberi. Polishing removes the bran and germ, which contain most of the thiamine, vitamin B1, so a diet based on polished rice leads to thiamine deficiency. Option (b), goitre, is caused by lack of iodine and is prevented by iodised salt. Option (c), night blindness, is caused by lack of vitamin A. Option (d), colour blindness, is a genetic, X-linked condition, not a dietary disease. Concept: beriberi affects nerves and the heart; wet beriberi affects the heart and dry beriberi the nerves. Parboiling rice before milling keeps more thiamine in the grain. Christiaan Eijkman's work on beriberi in chickens led to the discovery of vitamins and a Nobel Prize in 1929.

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Option (b) is the incorrect pair, so it is the answer: cod-liver oil is a classic source of vitamins A and D, not of vitamin B2, or riboflavin, which comes from milk, eggs, liver and green vegetables. Option (a) is correct: rice bran is rich in vitamin B6, or pyridoxine. Option (c) is correct: wheat germ oil is one of the richest sources of vitamin E, or tocopherol. Option (d) is correct: vitamin K was first isolated from alfalfa, a green plant. Concept: vitamins A, D, E and K are fat-soluble and stored in the body, while B and C are water-soluble. Vitamin K helps blood clot, and vitamin E is an antioxidant. Riboflavin deficiency causes cracks at the corners of the mouth, called cheilosis.

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Option (c) is right: A is true, but R is false. A is true: most vitamins cannot be made by the human body and must come from food. The body makes only a few, such as vitamin D in sunlit skin, niacin from the amino acid tryptophan, and vitamin K and some B vitamins made by gut bacteria. R is false: essential nutrients are by definition those the body cannot make, so saying human organs make only essential micronutrients is wrong. So options (a), (b) and (d) are wrong. Concept: the word vitamin was coined by Casimir Funk in 1912 from vital amine. Humans, unlike most animals, cannot make vitamin C, because they lack a key enzyme. Micronutrients include vitamins and minerals needed in small amounts.

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Option (b) is right: A-2, B-3, C-4, D-1. Kevlar is a strong aramid synthetic fibre used in bulletproof vests and helmets. Taxol, or paclitaxel, from the bark of the Pacific yew tree, is an anticancer drug used for breast and ovarian cancer. Zinc phosphide is a rodenticide, or rat poison, that releases toxic phosphine gas in the stomach. Nitrocellulose, also called guncotton, is an explosive and propellant. Options (a), (c) and (d) mismatch these. Concept: India's Himalayan yew, Taxus wallichiana, is also a source of taxol and is endangered from over-harvesting. Kevlar was developed at DuPont by Stephanie Kwolek in 1965. Other well-known explosives are TNT, RDX and nitroglycerine, which Alfred Nobel made stable as dynamite.

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Option (a) is right: camphor, naphthalene and dry ice, which is solid carbon dioxide, turn straight from solid to vapour without melting, a process called sublimation. That is why they seem to disappear when left in the open. Option (b), evaporation, is the change from liquid to vapour at the surface. Option (c), diffusion, is the spreading of particles from high to low concentration; the smell of camphor spreads by diffusion after it sublimes. Option (d), radiation, is a mode of heat transfer. Concept: the reverse process, gas to solid directly, is called deposition, as in frost formation. Other substances that sublime include iodine and ammonium chloride. Sublimation is used to separate such substances from mixtures, and naphthalene balls are used as moth repellents.

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Option (a) is right: optical fibres carry light by total internal reflection. Light enters the glass core, which has a higher refractive index than the surrounding cladding, and strikes the boundary at an angle greater than the critical angle, so it is fully reflected again and again and travels long distances with little loss. Option (b), diffraction, is the bending of light around obstacles. Option (c), scattering, explains why the sky is blue. Option (d), refraction, is the bending of light when it passes from one medium to another; it occurs at entry but is not what carries light along the fibre. Concept: Narinder Singh Kapany, an Indian-born physicist, is called the father of fibre optics. BharatNet uses optical fibre to link gram panchayats to broadband. Mirages and the sparkle of diamonds also use total internal reflection.

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Statement 1 is correct: enzymes are biocatalysts, mostly proteins, that lower the activation energy of reactions and are not used up. Statement 2 is also treated as correct in the official key, since many enzymes, such as intracellular respiratory enzymes, act inside the very cells that make them. Note, though, that digestive enzymes often act elsewhere: salivary amylase in the mouth, pancreatic trypsin and lipase in the small intestine. So option (c), both, is the answer per key, and options (a), (b) and (d) are rejected. Concept: enzymes are substrate-specific, work best at an optimum temperature and pH, and are denatured by heat; ribozymes show some RNA can also act as an enzyme.

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Option (a), iron, is correct. Human milk is nutritionally almost complete, but its iron content is low (about 0.3-0.5 mg per litre), though highly bioavailable thanks to lactoferrin. A full-term baby relies on iron stored in the liver before birth for roughly the first six months. Calcium (b) is present in good, well-absorbed amounts and supports bone growth; magnesium (c) and potassium (d) are also adequately supplied. Concept: WHO recommends exclusive breastfeeding for six months, then iron-rich complementary foods alongside continued breastfeeding. Colostrum, the first milk, is rich in antibodies (IgA). Vitamin D and vitamin K are the other nutrients often low in breast milk.

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Option (b), 4, 2, 3, 1, is correct. Kevlar, a para-aramid fibre, was made by Stephanie Kwolek at DuPont in 1965. Fullerene (C60, 'buckyball') was discovered by Kroto, Curl and Smalley in 1985 (Nobel 1996). Graphene, a single layer of carbon atoms, was isolated by Geim and Novoselov in 2004 (Nobel 2010). 'Black gold', gold nanoparticles on dendritic fibrous silica that absorb light and CO₂-convert, was reported by TIFR Mumbai in 2019. Option (a) puts the newest first; (c) puts fullerene before Kevlar; (d) puts black gold second. Concept: fullerene, graphene and carbon nanotubes are carbon allotropes, while Kevlar is a polymer used in bulletproof vests.

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Option (c) is correct: bibliometry, or bibliometrics, is an information management tool. It applies statistical methods to books, articles and citations, producing measures such as citation counts, the h-index and journal impact factors, used to judge research output and shape library collections. It is not a function of a library network (a), which is about resource sharing among libraries such as INFLIBNET or DELNET. Nor is it an information management service (b) or a library service (d), which are things like reference, lending or alerting services delivered to users. Concept: related fields are scientometrics (measuring science) and webometrics (measuring the web); Bradford's, Lotka's and Zipf's laws are classic bibliometric laws.

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Option (c), both, is correct. Statement 1: the Deep Carbon Observatory (2009-2019), funded largely by the Alfred P. Sloan Foundation, was a global research programme of about 1,000 scientists from over 50 countries studying the quantity, movement, forms and origin of carbon deep inside the earth. Statement 2: its Deep Life community did field observations by drilling and sampling deep mines, seabed and continental crust, finding a deep biosphere holding an estimated 15-23 billion tonnes of carbon, hundreds of times the mass of all humans. Options (a), (b) and (d) each leave out a true statement. Concept: the DCO found that over 90% of earth's carbon lies below the surface.

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Option (d), blue-green algae, is correct. Blue-green algae are actually cyanobacteria, prokaryotes such as Anabaena, Nostoc and Tolypothrix. They fix atmospheric nitrogen in thick-walled heterocysts, where the enzyme nitrogenase is shielded from oxygen. Red algae (a), brown algae (b) and green algae (c) are eukaryotic algae that photosynthesise but cannot fix nitrogen. Concept: in rice fields, cyanobacteria and the Azolla-Anabaena partnership serve as biofertilisers. Other nitrogen fixers are Rhizobium (symbiotic, legume root nodules), Azotobacter and Clostridium (free-living), and Frankia (non-legumes such as Alnus).

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Option (d), a collapsed star, is correct. When a very massive star (typically over about 20 solar masses) runs out of fuel, its core collapses under gravity, often after a supernova, into a region so dense that even light cannot escape beyond the event horizon. A flight recorder (a) is a 'black box', painted orange for visibility. A spot on the sun (b) is a sunspot, a cooler magnetic region. A place in Antarctica (c) is a distractor. Concept: lighter stars end as white dwarfs or neutron stars (the Chandrasekhar limit is 1.4 solar masses). The first image of a black hole (M87*) came from the Event Horizon Telescope in 2019.

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Option (b) is right: both statements are true, but R does not explain A. A is true: around 2019, Uttar Pradesh led India in sugarcane area and output and had overtaken Maharashtra in sugar production, but its cane yield and sugar recovery per hectare were lower than Maharashtra's. R is true: most sugar mills in Maharashtra are cooperatives. But ownership does not explain the gap in productivity, which depends on irrigation, the tropical climate, longer crop duration and better varieties, so (a) is wrong. Options (c) and (d) are wrong because both are true. Concept: tropical India, such as Maharashtra and Karnataka, gets higher yields than subtropical north India. Variety Co 0238 raised Uttar Pradesh's recovery after 2010. The Fair and Remunerative Price for cane is fixed by the Centre.

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