The angles of elevation of the top of a tower from two points at a distance of 4

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Question
The angles of elevation of the top of a tower from two points at a distance of 4 m and 9 m from the base of the tower and in the same straight line with it are complementary. The height of the tower is
Options
A. 4 m
B. 7 m
C. 9 m
D. 6 m

Correct Answer

6 m

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1. A telegraph post is bent at a point above the ground. Its top just touches the ground at a distance of 8?3 m from its foot and makes an angle of 30� with the horizontal. The height (in metre) of the post is
Options
A. 12
B. 16
C. 18
D. 24

2. A pilot in an aeroplane at an altitude of 200 m observes two points lying on either side of a river. If the angles of depression of the two points be 45� and 60�, then the width of the river is
Options
A. (200 + 200/?3) m
B. (200 - 200/?3) m
C. 400 ?3 m
D. (400/?3) m

3. The angles of elevation of top and bottom of a flag kept on a flag post from 30 metres distance, are 45 and 30 deg respectively. Height of the flag is [taking ?3 = 1.732]
Options
A. 12 ?3 m
B. 15 m
C. 14.32 m
D. 12.68 m

4. A 25m long ladder is rested on a wall. The foot of the ladder is 7m away from the wall. If the end of the ladder (resting on the wall) slides down 4m, then how far will its foot move away?
Options
A. 5 m
B. 8 m
C. 9 m
D. 10 m

5. Two men are on opposite sides of a tower. They measure the angles of elevation of the top of the tower as 30 ? and 45 ? respectively. If the height of the tower is 50 m, the distance between the two men is (Take ?3 = 1.73)
Options
A. 136.5 m
B. 50 ?3 m
C. 100 ?3 m
D. 135.5 m

6. A helicopter, at an altitude of 1500 m, finds that two ships are sailing towards it, in the same direction. The angles of depression of the ships as observed from the helicopter are 60� and 30�respectively. Distance between the two ships, in metres is
Options
A. 1000?3
B. 1000/?3
C. 500?3
D. 500/?3

7. The angle of elevation of an aeroplane as observed from a point 30 m above the transparent water-surface of a lake is 30� and the angle of depression of the image of the aeroplane in the water of the lake is 60�. The height of the aeroplane from the water-surface of the lake is
Options
A. 60 m
B. 45 m
C. 50 m
D. 75 m

8. The angles of elevation of the top of a tree 220 meters high from two points lie on the same plane are 30� and 45�. What is the distance (in metres) between the two points?
Options
A. 193.22
B. 144.04
C. 176.12
D. 161.05

9. The angles of elevation of the top of a tower 72 metre high from the top and bottom of a building are 30� and 60� respectively. What is the height (in metres) of building?
Options
A. 42
B. 20?3
C. 24?3
D. 48

10. The angle of elevation of an aeroplane from a point on the ground is 60 deg. After flying for 30 seconds, the angle of elevation changes to 30 deg. If the aeroplane is flying at a height of 4500 m, then what is the speed (in m/s) of aeroplane?
Options
A. 50?3
B. 100?3
C. 200?3
D. 300?3

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