SSC CHSL 2014 · Question 152 of 209

DIRECTIONS : In Question Nos. 96 to 100, a part of the sentence is The length of the shadow of a vertical tower on level ground increases by 10 metres when the altitude of the sun changes from 45° to 30°. Then the height of the tower is + -

AmetresCorrect
Bmetres 5( 3 1) 5( 3 1) 5
C5 3 metres
D3 metres thousand numbers) from Six Branches - B1, B2, B3, B4, B5 and B6 of a Publishing Company in 2000 and 2001. Study the graph and answer the question that follow: 120 110 States (in thousand numbers) 100 90 80 70 60 50 40 30 20 10 0 B1 B2 B3 B4 B5 B6 Branches

Answer: A. metres

Explanation

30° 45° B D C 10 m In DABC, tan 45° = AB BC AB Þ = = AB BC 1 ...(1) BC In DABD, tan 30° = AB BD 1 AB = BD 3 BD = AB 3 DC + BC = AB 3 - DC = AB 3 AB [from (i)] ( ) = - 10 AB 3 1 + ( ) 10 3 1 = ´ = + AB 5 3 1 m - + 3 1 3 1

Source: SSC CHSL Solved Paper 16-11-2014 (Disha Publications) · reliable-secondary

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