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NDA - Height & Distance Test 968
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NDA - Height & Distance Test 968
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  • Question 1/5
    1 / -0.33
    A tower of height b subtends an angle at a point O on the level of the foot of the tower and at a distance a from the foot of the tower. If a pole mounted on the tower also subtends an equal angle at O, the height of the pole is

    Solutions

    Let AB is tower and AC is pole of height h.

    From  ......(i)

    From  or

    or  (Put value of  from (i))

    or .

    Remember the result  in which  height of tower,  height of pole, a = distance of observation point from the tower

  • Question 2/5
    1 / -0.33
    The angle of elevation of a cloud C from a point P, above a still lake is . If the angle of depression of the image of C in the lake from the point P is , then PC (in m) is equal to:
    Solutions

    Correct option is C

                                                               

  • Question 3/5
    1 / -0.33
    The angle of elevation of the top of a pillar at any point A on the ground is 15o. On walking 40 metre towards the pillar, the angle becomes 30o. The height of the pillar is
    Solutions

     Ã

    metre

  • Question 4/5
    1 / -0.33
    A man is walking towards a vertical pillar in a straight path at a uniform speed. At a certain point A on the path ,he observes that the angle of elevation of the top of the pillar is .After walking for  minutes from A in the same direction ,at a point B, he observes that the angle of elevation of the top of the pillar is .Then the time taken (in minutes)by him ,from B to reach the pillar is:
    Solutions

    Correct option is B.

  • Question 5/5
    1 / -0.33
    The shadow of a tower standing on a level plane is found to be 50 m longer when the Sun's elevation is 30° than when it is 60°. The height of the tower is
    Solutions

    Correct Answer is option B

    Given:






    Substituting equation 2 in equation 1 we get,





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