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Railways PYQCBT 1 2016

RRB NTPC · Question 99

The length of the shadow of a pillar is reduced to 24 m, when the angle of elevation of the Sun increases from 30° to 60°, the length of the pillar is: A. 10√3 B. 8√3 C. 16√3 D. 12√3

  1. B

  2. A

  3. C

  4. D

Show answer & explanation

Answer: (D) D

Explanation

Let the height be h. The shadow at 30° is h√3 and at 60° it is h/√3. The difference h(√3 − 1/√3) = 2h/√3 = 24, so h = 12√3 m.