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State PCS PYQPrelims 2023

BPSC – Combined Competitive Examination · Question 97

The average height of the Kosi plain above mean sea level is:

  1. 300 m
  2. 150 m
  3. 30 m
  4. None of the above
Show answer & explanation

Answer: (C) 30 m

Explanation

The north Bihar plains slope only ~15–20 cm per km, so the Kosi plain is low and flood-prone.

  • (A) Incorrect

    Wrong: far too high for the Ganga plain.

  • (B) Incorrect

    Wrong: too high.

  • (C) Correct

    Correct: the very flat Kosi plain lies around 30 m above sea level.

  • (D) Incorrect

    Wrong: 30 m is the accepted answer.