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Q.

A hole is drilled in a metal sheet. At 270C, the diameter of hole is 5 cm. When the sheet is heated to 1770c, The change in the diameter of hole is. (coefficient of linear expansion of metal is 1.6×10−5/c0

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a

12×10−3cm

b

6×10−3cm

c

48×10−3cm

d

24×10−3cm

answer is B.

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Detailed Solution

Change in diameter of the hole is given by 

Δd=d α Δt

=5×1.6×10−5×150

=12×10−3cm

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