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GeographyEasyAsked in: RRB NTPC · 7 Jan 2021, Shift 2 (CBT 1)

The quartzite is a ________ type of rock.

  1. A.igneous
  2. B.basalt
  3. C.sedimentary
  4. D.metamorphic

Correct answer

D. metamorphic

Explanation

The correct answer is D, metamorphic. Quartzite is formed when sandstone, a sedimentary rock, is changed by great heat and pressure deep inside the earth. The quartz grains of the sandstone recrystallise and fuse, so quartzite becomes one of the hardest and most weather-resistant rocks, which is why the ridges of the Aravalli range and the Delhi Ridge, made largely of quartzite, have survived for hundreds of millions of years. Such change of an existing rock without melting is called metamorphism. A is wrong because igneous rocks such as granite and basalt form from cooled magma or lava, not from an older rock under pressure. B is wrong because basalt is itself a specific igneous rock, not a class of rock. C is wrong because sedimentary is the parent type; sandstone is sedimentary, but once transformed it is no longer classed that way. Exam tip: sandstone becomes quartzite, limestone becomes marble, shale becomes slate, granite becomes gneiss.

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.