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On the level ground, the angle of eleva...

On the level ground, the angle of elevation of a tower is `30^(@)`. On moving 20 m nearer, the angle of elevation is `60^(@)`. The height of the tower is

A

10 m

B

20 m

C

`10sqrt3`m

D

none of these

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The correct Answer is:
C
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OBJECTIVE RD SHARMA ENGLISH-HEIGHTS AND DISTANCES-Exercise
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  2. The angle of elevation of a cloud from a point h mt. above is theta^@ ...

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  3. On the level ground, the angle of elevation of a tower is 30^(@). O...

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  4. Each side of an equilateral triangle subtends an angle of 60^(@) at th...

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  5. The angle of elevation of the top of a tower at any point on the groun...

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  6. Form the top of a light house 60 m high with its base at the sea-level...

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  7. A person standing on the bank of a river observes that the angle subte...

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  8. AB is a vertical pole. The end A is on the level ground .C is the midd...

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

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  10. about to only mathematics

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  11. A tower subtends an angle alpha at a point A in the plane of its...

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  12. The angle of elevation of the top of a tower standing on a horizontal ...

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  13. From an aeroplane vertically above a straight horizontal road, the ...

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  14. A vertical tower stands on a declivity which is inclined at 15^(@) to ...

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  15. The angle of elevation of an object on a hill from a point on the grou...

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  16. A tower of x metres height has flag staff at its top. The tower and th...

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  17. .A house of height 100 m substends a right angle at the window of an o...

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  18. A tower of height b subtends an angle at a point 0 on the ground level...

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  19. A man of height 6 ft. observes the top of a tower and the foot of th...

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  20. If the elevation of the sun is 30^@ , then the length of the shadow c...

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