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The angle of elevation of the top of an ...

The angle of elevation of the top of an unfinished tower from a point at a distance of 120 metres from its bace is `45^(@)`. The height of the tower that must be raised so that the angle of elevation at the same point may be `60^(@)` is

A

`120(sqrt(3)-1)m`

B

`120(sqrt(3)+1)m`

C

`120sqrt(3)m`

D

`140sqrt(3)m`

Text Solution

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  16. The angle of elevation of a stationar cloud from a point 2500 m above ...

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  17. The angle of elevation of the top point P of a vertical tower PQ of he...

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  18. The angle of elevation of the top of the tower is 45^(@) on walking up...

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  19. A flag-staff stands on a tower which is on level ground. The total hei...

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  20. A flag staff stands vertically on a pillar. The height of the flag sta...

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