Multiple Choice Questions on The angle of elevation of an aeroplane as observed from a point 30 m above the transparent water sur........... for SSC CGL Exam Preparation

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Multiple Choice Questions

The angle of elevation of an aeroplane as observed from a point 30 m above the transparent water sur...........

Quantitative Aptitude (CGL) Height and Distance
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    The angle of elevation of an aeroplane as observed from a point 30 m above the transparent water-surface of a lake is 30° and the angle of depression of the image of the aeroplane in the water of the lake is 60°. The height of the aeroplane from the water-surface of the lake is

    60 m

    Correct Answer

    45 m

    Incorrect Answer

    50 m

    Incorrect Answer

    75 m

    Incorrect Answer
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    Explanation:

    ?ABEtan30°=AB/EB 
    1/√3=h/x⇒x=√3×h.....(i)
    ?EBD
    tan60°=BD/EB
    √3=(h+30+30)/x
    √3=h+60/√3h
    3h=h+60
    2h=600⇒h=30m
    height from water surface
    =30+30=60m

    By: MIRZA SADDAM HUSSAIN
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