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Questions  

A metal rod has length of 1m at 20C. α of metal is 2×105/0C. The temperature at which its length will be decreased by 1mm is 
 

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By Expert Faculty of Sri Chaitanya
a
−10∘C
b
−20∘C
c
−30∘C
d
30∘C

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detailed solution

Correct option is C

Δl=l1αΔt

ctaimg

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A rotating solid metal sphere is heated by 100C. If  α=2×105/0C then percentage change in its moment of inertia is 
 

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