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Q.

A clock with an iron pendulum  keeps correct  time at 15°C . If  the coefficient  of linear expansion of iron is 0.000012/0C and the room  temperature is 20°C it loses in a day

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a

1.3 s

b

2.6 s

c

3.2 s

d

3.8 s

answer is B.

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Detailed Solution

Time lose = 12×αΔt×86,400=12×12×10−6×5×86,400=30×86,400×10−6=3×8.64×10−1= 2.6 sec
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