Question

Two rods of copper and steel having same area of cross - section but different lengths $ l_{1} $ and $ l_{2} $ respectively are connected to each other. The combined length of two rods fits between two walls without any stress on walls. If $ \alpha_{1} $ and $ \alpha_{2} $ are their coefficient of linear expansion, $ Y_{1} $ and $ Y_{2} $ are their Young's modulus respectively, then (There is no buckling of rods while heating) With increase in temperature:

Accepted Answer

combined length remains $ l_{1}+l_{2} $ while length of one rod increases and that of other decreases

Answer

the combined length of rods on heating remains $ l_{1}+l_{2} $ but $ l_{1} $ and $ l_{2} $ both changes

Answer

the combined length $ l_{1}+l_{2} $ as well as $ l_{1} $ and $ l_{2} $ remains the same

Answer

on heating length of each rod increases and combined length also increases

JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS

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