UPSC Prelims 2023 · GS Paper I: Consider the following statements :Statement-I : The temperature contrast between continents and oceans is…

Statement I is wrong but Statement II is correct (d). Statement II is right: water has a much higher specific heat than rock and soil, so the oceans warm and cool slowly, while land heats and cools fast. Statement I is marked wrong: UPSC's key treats the land–sea temperature contrast as greater in winter, when continental interiors such as Siberia become extremely cold while the oceans stay mild. So the difference in winter is larger than in summer.

Notice the effects: continental climates have a big range between summer and winter, while maritime climates stay mild. The land–sea contrast also drives land and sea breezes daily and the monsoon seasonally. The Siberian High in winter is the result of this deep cold.

Answer as per the official UPSC answer key.

Bahrain and Qatar must cross the Strait of Hormuz (b). The Strait of Hormuz, between Iran and Oman, is the only sea exit from the Persian Gulf. Items 1 and 3 are right: Bahrain and Qatar lie wholly inside the Gulf, so their ships must pass it. Item 2 is wrong: Syria is on the Mediterranean. Item 4 is wrong: Egypt reaches the Indian Ocean through the Suez Canal and the Red Sea. So options (a), (c) and (d) fail.

Notice its importance: about a fifth of the world's oil passes through Hormuz, and much of India's crude and LNG (Qatar is a top LNG supplier). Iran's threats to close it raise prices. The UAE's pipeline to Fujairah and Saudi pipelines to the Red Sea help bypass it.

Answer as per the official UPSC answer key.

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Tungurahua is in Ecuador (a). Tungurahua, meaning "throat of fire", is an active stratovolcano in the Andes of central Ecuador, above the town of Baños. UNESCO named the area around it a Global Geopark in 2025. Options (b), (c) and (d), Peru, Bolivia and Colombia, are wrong, though the Andes pass through all of them too.

Notice Ecuador's other famous volcanoes: Cotopaxi, one of the highest active volcanoes, and Chimborazo, whose summit is the point farthest from Earth's centre, because of the equatorial bulge. Ecuador also owns the Galápagos Islands. A Global Geopark honours geological heritage; India has none yet, though sites like Lonar have been proposed.

Answer as per the official UPSC answer key.

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Statements 1 and 2 are correct (b). Statement 1 is right: the islands lie close to the equator in the Bay of Bengal, so they are hot and humid all year, a tropical coastal climate. Statement 2 is right: they get rain from both the south-west and north-east monsoons, from about May to December. Statement 3 is wrong: January to April is the driest part of the year, so maximum rain is not between December and May. So options (a), (c) and (d) fail.

Notice the islands' features: Barren Island, India's only active volcano; Saddle Peak, the highest point; and Indira Point, India's southernmost tip. Rich tropical evergreen forests cover them, and cyclones often form nearby.

Answer as per the official UPSC answer key.

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Features 1 and 2 belong to the Peninsular Block (b). The Peninsula is an old, stable block. Item 1 is right: faulting submerged parts of the west coast. Item 2 is right: long erosion left residual hills such as the Veliconda and Mahendragiri. Item 3 is wrong: Peninsular rivers are mature, with broad, shallow valleys; deep V-shaped valleys belong to the young Himalayan rivers. So options (a), (c) and (d) fail.

Notice other Peninsular traits: Gondwana coal, Deccan Traps basalt, rift valleys of the Narmada and Tapi, which flow west into the Arabian Sea, and old block mountains like the Aravallis, among the world's oldest. Rivers here are rain-fed, not snow-fed.

Answer as per the official UPSC answer key.

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