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From a point on the level ground, the angle of elevation of the top of a pole is `30^@`. On moving 20 metres nearer, the angle of elevation is `45^@`. Then the height of the pole, in metres , is

A

`10(sqrt(3)-1)`

B

`10(sqrt(3)+1)`

C

`15`

D

`20`

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The correct Answer is:
B
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AAKASH SERIES-HEIGHTS AND DISTANCES-PRACTICE SHEET Exercise-I (Level-I) (Straight Objective Type Questions)
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  2. AB is a vertical pole with B at the ground level and and A at the top ...

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  3. From a point on the level ground, the angle of elevation of the top of...

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  4. The angle of elevation of an object from a point P on the level ground...

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  5. The elevation of an object on a hill is observed from a certain point...

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

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

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  8. The angle of elevation of the top of an unfinished tower from a point ...

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

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

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

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

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

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

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

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

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

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

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

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  20. From the top of the hill h meers high the angles of depressinons of th...

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