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GeographyEasyAsked in: Delhi · DSSSB JSA, 23 Apr 2022, Shift 1

Which of the following rocks is an intrusive igneous rock?

  1. A.Sandstone
  2. B.Slate
  3. C.Basalt
  4. D.Granite

Correct answer

D. Granite

Explanation

The correct answer is D, Granite. Granite forms when magma cools slowly deep inside the Earth's crust, so it is an intrusive or plutonic igneous rock. Slow cooling gives the minerals time to grow, which is why granite shows large, clearly visible grains of quartz, feldspar and mica. It is hard and long-lasting, so it is widely used in buildings, monuments and kitchen tops. Option A is wrong because sandstone is a sedimentary rock made of sand grains pressed and cemented together; the Red Fort in Delhi is built of red sandstone. Option B is wrong because slate is a metamorphic rock formed when shale is changed by heat and pressure. Option C is wrong because basalt is an extrusive igneous rock: lava cools quickly on the surface, giving fine grains, and the Deccan Traps are made of basalt. Exam tip: intrusive means it cools inside, slowly, with big crystals (granite); extrusive means it cools outside, fast, with fine grains (basalt).

Practice Questions

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Q2.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements is/are correct? 1. Himalayan rivers have their origin in the snow-covered areas, hence are dry in winter season. 2. Rivers of the Peninsular Plateau have reached maturity. 3. Himalayan rivers depict all the three stages of normal cycle of erosion. Select the correct answer using the code given below.

  1. A.2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: C. 2 and 3 only

Himalayan rivers are perennial, so statement 1 is wrong, while statements 2 and 3 are correct. Himalayan rivers such as the Ganga, Indus and Brahmaputra rise from glaciers and snowfields and also get monsoon rain, so they flow all year round, including in winter.

Q3.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements related to latitude are true? 1. Rainfall, temperature and vegetation vary with latitude. 2. The difference between the longest day and the shortest day increases with latitude. 3. Indira Point is located approximately at 6°45' N latitude. Select the correct answer using the code given below.

  1. A.1 and 2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3

All three statements about latitude are true. Latitude decides how directly the Sun's rays strike a place, so temperature, rainfall and the type of vegetation change from the equator towards the poles, from hot, wet rainforests to cold tundra.

Q4.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following lakes is/are situated in Ladakh? 1. Tso Kar 2. Pangong Tso 3. Tsomgo 4. Tso Moriri Select the correct answer using the code given below.

  1. A.1 only
  2. B.2 and 3
  3. C.1, 2 and 4
  4. D.2 and 4 only
Show answer
Correct answer: C. 1, 2 and 4

Tso Kar, Pangong Tso and Tso Moriri are high-altitude lakes of Ladakh, while Tsomgo lies in Sikkim. Pangong Tso, at about 4,350 metres, is a long, narrow lake that stretches from Ladakh into Tibet, and most of its length lies on the Chinese side.