NextMockSearch exams, e.g. SSC CGL, UPPSC, Lekhpal
Railways PYQCBT 1 2016

RRB NTPC · Question 8

A ladder 20 m long is leaning against a vertical wall. It makes an angle of 30° with the ground. How high on the wall does the ladder reach? A. 10 m B. 17.32 m C. 34.64 m D. 30 m

  1. C

  2. D

  3. B

  4. A

Show answer & explanation

Answer: (D) A

Explanation

The ladder (20 m) is the hypotenuse of a right triangle, and the height reached on the wall is the side opposite the 30° angle. Height = 20 × sin 30° = 20 × ½ = 10 m.