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A man standing on a level plane observes the anlge of elevation of top of pole to be '`alpha`'. He walks a distance equal to double the height of pole towards it and finds that the elevation in `2 alpha " then " alpha` =

A

`(pi)/(12)`

B

`(pi)/(4)`

C

`(pi)/(6)`

D

`(pi)/(3)`

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The correct Answer is:
A
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AAKASH SERIES-HEIGHTS AND DISTANCES-PRACTICE SHEET Exercise-I (Level-I) (Straight Objective Type Questions)
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  6. The elevation of an object on a hill is observed from a certain point...

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  7. The sum of angles of elevation of the top of a tower from two points d...

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  8. Two pillars of equal height stand at a distance of 100 metres. At a po...

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  10. In a prison wall there is a window of 1 metre height, 14 metres from t...

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  11. The angles of elevation of a tower from two points which are at distan...

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  12. The angle of elevation of the top of a tower from the top and botton o...

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  13. A flag staff of length 'd' stands on tower of height h. IF at a point ...

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  14. The tops of two poles of heights 10 metres and 12 metres are connected...

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  15. At a certain point the angle of elevation of a tower is found to be co...

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  16. The length of the shadow of vertical pole of height h, thrown by the s...

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  17. A person observes the top of a tower from a point A on the ground. the...

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  18. From the top of a tree, a man observes the angle of deppression of a p...

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  19. From the top of a chiff 30 metres high, the angle of elevation of the ...

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  20. A tower subtends an angle alpha at a point A on the same level as the ...

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