Class X

An electric pole is 10m high A steel wire tide to the top of the pole is affixed at appoint on the ground to keep up right . If the steel weire makes an angle 45ᵒ with the horizontal through the foot of the pole Here , the length of the steel wire is
  1. (10/ 20√)m
  2. 20m
  3. 14m
  4. 10√2 m
An observer 1.6 m tall is 203 away from a tower. The angle of elevation from his eye to the top of the tower is 30º. The heights of the tower is:
  1. 21.6 m
  2. 23.2 m
  3. 24.72 m
  4. None of these
Two ships are sailing in the sea on the two sides of a lighthouse. The angle of elevation of the top of the lighthouse is observed from the ships are 30° and 45° respectively. If the lighthouse is 100 m high, the distance between the two ships is:
  1. 173 m
  2. 200 m
  3. 273 m
  4. 300 m
The angle of elevation of the sun, when the length of the shadow of a tree 3 times the height of the tree, is:
  1. 30º
  2. 45º
  3. 60º
  4. . 90º
From a point P on a level ground, the angle of elevation of the top tower is 30º. If the tower is 100 m high, the distance of point P from the foot of the tower is:
  1. 149 m
  2. 156 m
  3. . 173 m
  4. . 200 m
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