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Rajat observes that the angle of elevati...

Rajat observes that the angle of elevation of the first floor of a building at a point A on the ground is `30^(@)`. He moves `sqrt(3)` units towards the building to the point B and finds that the angle of elevation of the second floor of the building is `60^(@)`. If each floor has the same height, height of the 7th floor from the ground in units is

A

5

B

7

C

21

D

35

Text Solution

Verified by Experts

The correct Answer is:
C
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MCGROW HILL PUBLICATION-HEIGHTS AND DISTANCES -SOLVED EXAMPLES (LEVEL 1 ( SINGLE CORRECT ANSWER TYPE QUESTIONS ))
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  2. A pole of 50 meter high stands on a building 250 m high. To an observe...

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  3. Two vertical poles of height a and b subtend the same angle 45^(@) at ...

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  4. A monument ABCD stands at A on a level ground. At a point P on the gro...

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  5. A vertical tower CP subtends the same angle theta, at point B on the h...

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  8. A tower BCD surmounted by a spire DE stands on a horizontal plane. At ...

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  10. A tree is broken by wind, its upper part touches the ground at a point...

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  11. From the top of a cliff of height a, the angle of depression of the f...

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  12. A river flows due North, and a tower stands on its left bank. From a p...

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  13. From a point a metres above a lake the angle of elevation of a cloud i...

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  14. A balloon of radious r suntends an angle alpha at the eyes of an obser...

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  15. Two poles of height a and b stand at the centers of two circular plots...

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  16. A tower is standing in the centre of an elliptic field. If Adya observ...

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  17. A tower of height h stands at a point O on the ground. Two poles of he...

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  18. Rajat observes that the angle of elevation of the first floor of a bui...

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  19. A pole of height h stands in the centre of a circular platform in the ...

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  20. The tangents of the angles subtended by a tower at four points A, B, C...

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