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State PCS PYQPrelims 2023

BPSC – Combined Competitive Examination · Question 92

Bihar's geological structure consists of several rock systems. Match the rock systems with their descriptions: a. Dharwar rock system b. Vindhyan rock system c. Quaternary rock system d. Tertiary rock system 1. Created by rapid deposition of alluvium by Himalayan and Peninsular rivers 2. Found in West Champaran district 3. Part of the oldest Archaean rock system 4. Sandstone, limestone, dolomite, quartzite and shale are the main constituents

  1. a-3, b-4, c-1, d-2
  2. a-1, b-3, c-2, d-4
  3. a-2, b-3, c-4, d-1
  4. a-4, b-2, c-3, d-1
Show answer & explanation

Answer: (A) a-3, b-4, c-1, d-2

Explanation

In Bihar, Tertiary (Shivalik) rocks occur in the north of West Champaran; Quaternary alluvium covers the Ganga plain.

  • (A) Correct

    Correct: Dharwar–Archaean, Vindhyan–sandstone/limestone, Quaternary–alluvium, Tertiary–West Champaran (Shivalik).

  • (B) Incorrect

    Wrong: Dharwar is not alluvial.

  • (C) Incorrect

    Wrong: most pairs are wrong.

  • (D) Incorrect

    Wrong: most pairs are wrong.