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

A

`10(sqrt3-1)m`

B

`10(sqrt3+1)m`

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 HEIGHTS AND DISTANCES) (LEVEL- I (MAIN) SINGLE ANSWER TYPE QUESTIONS)
  1. A man standing on a level plane observes the anlge of elevation of top...

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  2. AB is vertical pole with B at ground level and A at the top. A man fi...

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

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

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

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  7. The angle of elevation of the top of a tower standing on a harzontal p...

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  8. A person stading on the bank of a river observerves that the angle of ...

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  9. From the top of a hill h metre high, the angles of depressions of the ...

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  10. A chimney leans towards north. At equal distance due north and south o...

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  11. A tower subtends angles alpha,2 alpha, 3 alpha respectively at points ...

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

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

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

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  15. A tower stands at the top a hill whose height is three times the heigh...

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  16. A vertical pole more than 100 ft high consists of two portions the low...

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  17. A straight pole A subtends a right angle at a point B of another pole ...

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  18. A tower, of x metres high, has a flagstaff at its top. The tower and t...

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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. From a point E on the horizontal due to east of a tree, the top of the...

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