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If the height of a pole is 2√3 angle of elevation of the sun.

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If the height of a pole is 2√3 meters and the length of its shadow is 2 meters, find the angle of elevation of the sun.
A. 50°
B. 60°
C. 70°
D. 80°

View Answer
B. 60°

Let AB be the pole and AC be its shadow. Let the angle of elevation, ∠ACB = θ. Then, AB = 2√3m, AC = 2 m. tan θ = AB/AC = 2√3/2 = √3 θ = 60°. So, the angle of elevation is 60°

The angle of elevation of the sun

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The angle of elevation of the sun, when the length of the shadow of a tree is √3 times the height of the tree, is:________?
A. 30°
B. 45°
C. 60°
D. 90°

View Answer
A. 30°

Let AB be the tree and AC be its shadow.
Let ∠ACB = θ.
Then, AC/AB = √3
Cot θ = √3
θ = 30°

the distance of point P from the foot of the building is:_________?

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From point P on level ground, the elevation angle of a tower’s top is 30°. If the tower is 100 m high, the distance of point P from the foot of the building is:_________?
A. 149 m
B. 156 m
C. 173 m
D. 200 m

View Answer
C. 173 m

Let AB be the tower. Then, ∠APB = 30° and AB = 100 m, AB/AP = tan 30° = 1/√3 AP = (AB X √3)= 100√3 m. = (100 X 1.73) m = 173 m.

interest on a sum of Rs. 25,000 after 3 years at 12%?

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What will be the compound interest on a sum of Rs. 25,000 after 3 years at 12% p.a.?
A. Rs. 9000.30
B. Rs. 9720
C. Rs. 10123.20
D. Rs. 10483.20

View Answer
C. Rs. 10123.20

Amount = [25000 * (1 + 12/100)3]

= 25000 * 28/25 * 28/25 * 28/25 = Rs. 35123.20
C.I. = (35123.20 – 25000) = Rs. 10123.20

How much will it become at the end of 3 years?

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A man saves Rs. 200 at the end of each year and lends the money at 5% compound interest. How much will it become at the end of 3 years?
A. Rs. 565.25
B. Rs. 635
C. Rs. 662.02
D. Rs. 666.50

View Answer
C. Rs. 662.02

Amount = [200(1 + 5/100)3 + 200(1 + 5/100)2 + 200(1 + 5/100)]

= [200 * 21/20(21/20 * 21/20 + 21/20 + 1)] = Rs. 662.02