UPSC Static Quiz – Geography : 9 July 2026

Solution: A

• The International Date Line (IDL) is an imaginary line that generally follows the 180° meridian but deviates at several places to ensure that countries, island groups, and political territories remain on the same calendar day. If the IDL strictly followed the 180° longitude, several nations and island chains would be divided into two different dates, creating administrative and economic complications. Hence, Statement 1 is correct.
• Statement 2 is also correct because the Earth rotates from west to east, causing places situated on different longitudes to experience different local times. Since the Earth completes one rotation of 360° in approximately 24 hours, it rotates 15° every hour (or 1° every 4 minutes), forming the basis of local time differences and standard time zones.
• Information 1 supports Statement 1 because Anadyr (Russia) and Nome (Alaska, USA) are geographically close but lie on opposite sides of the International Date Line, resulting in different calendar dates despite their proximity.
• Information 2 supports Statement 2 by explaining the scientific basis of local time differences through Earth’s rotation.

However, Information 3 is incorrect because countries have not universally chosen standard meridians as exact multiples of 7.5° longitude. Standard meridians are selected according to national administrative convenience. For example, India uses 82.5°E, Nepal uses 86°15′E, and China follows a single standard time based on 120°E, despite spanning multiple time zones geographically.

Solution: C

The classification of rocks is based on their origin and the geological processes through which they are formed.

• Basalt : Plutonic Intrusive Igneous — Incorrect
  Basalt is an extrusive (volcanic) igneous rock, not a plutonic intrusive rock. It forms when low-viscosity basaltic lava cools rapidly on or near the Earth’s surface, producing a fine-grained texture. In contrast, plutonic intrusive rocks, such as granite and gabbro, cool slowly beneath the Earth’s surface and develop coarse-grained crystals.
• Quartzite : Metamorphic Rock — Correct
  Quartzite is a metamorphic rock formed when quartz-rich sandstone undergoes intense heat and pressure. During metamorphism, the quartz grains recrystallize into a hard, compact rock with interlocking crystals, making quartzite highly resistant to weathering and erosion.
• Rock Salt : Chemically Precipitated Sedimentary — Correct
  Rock salt is a chemical sedimentary rock, also known as an evaporite. It forms when saline water in enclosed basins evaporates, causing dissolved sodium chloride (halite) to precipitate and accumulate in layers. Such deposits are common in arid and semi-arid regions.
• Gneiss : Foliated Metamorphic Rock — Correct
  Gneiss is a foliated metamorphic rock produced under high-grade metamorphism. It is characterized by alternating light and dark mineral bands, known as gneissic banding, which develops due to mineral segregation under intense heat and directed pressure.

Solution: A

• Young and old fold mountains differ significantly in their morphology because of their age, tectonic activity, and the cumulative effects of weathering and erosion.
• Statement 1 is correct. Young fold mountains are characterized by sharp peaks, steep slopes, deep valleys, and active seismicity because they are geologically recent and continue to experience tectonic movements. Inference 1 is therefore correct, as these features indicate that such mountains have not yet undergone prolonged exogenic weathering and denudation. Continuous uplift often offsets erosional processes, preserving their rugged topography. The Himalayas, Andes, and Alps are classic examples.
• Statement 2 is also correct. Old fold mountains possess rounded summits, gentle slopes, and low relief because they have been subjected to millions of years of weathering, erosion, and denudation. Consequently, Inference 2 is correct since it reflects the geomorphological principle that exogenic processes gradually wear down mountain ranges, reducing their elevation and ruggedness over geological time.
• Statement 3 is correct. The Appalachian Mountains were formed during the Paleozoic Era through a series of ancient mountain-building events (orogenies). However, Inference 3 is incorrect because the Appalachians are not morphologically similar to the young Himalayas. Despite having originated as fold mountains, they are now old fold mountains with subdued relief, rounded peaks, broad valleys, and relatively low elevations due to extensive erosion over hundreds of millions of years. In contrast, the Himalayas remain geologically young, tectonically active, and highly rugged.

Solution: D

• Bauxite (1): The world’s leading producer of bauxite is Australia (B), not South America. Major deposits are found in the Pilbara region (Z) of Western Australia. South America, particularly Brazil and Guyana, does have significant bauxite deposits associated with the Guiana Highlands (Y), but Australia is the top producer. So, 1-B-Z would be a correct link, and 1-A-Y is plausible but not the best match globally.
• Lithium (2): A significant portion of the world’s high-grade lithium reserves is found in the “Lithium Triangle” in South America (A), specifically in the salt flats of the Atacama Desert (X) in Chile and surrounding areas in Argentina and Bolivia. Therefore, the combination 2-A-X is a perfect match.
• Iron Ore (3): The world’s largest producer and exporter of iron ore is Australia (B), primarily from the Pilbara region (Z). While Africa (C) has iron ore deposits, it is not the leading continent, and the Pilbara region is not in Africa. So 3-C-Z is incorrect.

Solution: C

• Statement 1 is correct. The Strait of Hormuz is a critical chokepoint for global oil supplies, connecting the oil-rich Persian Gulf with the Gulf of Oman and the open Arabian Sea.
• Statement 2 is incorrect. The Strait of Malacca, another vital shipping lane, separates the Malay Peninsula (Peninsular Malaysia) from the Indonesian island of Sumatra, not Borneo. The island of Borneo is further to the east.
• Statement 3 is correct. The Bab-el-Mandeb Strait is a strategic link between the Indian Ocean and the Mediterranean Sea, via the Red Sea and the Suez Canal. It connects the Red Sea to the Gulf of Aden.
• Statement 4 is correct. The Bering Strait is a narrow sea passage located between the easternmost point of the Asian continent (Russia’s Chukchi Peninsula) and the westernmost point of the North American continent (Alaska’s Seward Peninsula). It separates Asia from North America.