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  9. Q142

SSC CHSL 2013 · Question 142 of 207

DIRECTIONS: In questions no. 96 to 100, you have a brief The length of the shadow of a vertical tower on level ground increases by 10 metres when the altitude of the sun changes from 45° to 30°. Then the height of the tower is

  1. A10 3 m 5 3 m + +
  2. B10( 3 1)m 5( 3 1)m q- qCorrect

Answer: B. 10( 3 1)m 5( 3 1)m q- q

Explanation

h 45° 30° B D c x 10 m h Þ = From DABC, tan45° = h x x h h = In DABD, tan30° = + + x 10 h 10 1 h = + h 10 3 + h = 5( 3 1)m q - q 4 5sin 3cos

Source: SSC CHSL Solved Paper 20-10-2013 (Disha Publications) · reliable-secondary

← Q141View full paper (207 questions)Q143 →

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