# NEET Questions Solved

NEET - 2016

Coefficient of linear expansion of brass and steel rods are  lengths of brass and steel rods are  respectively. If $\left({l}_{2}-{l}_{1}\right)$ is maintained same at all temperatures, Which one of the following relations holds good?

(a) ${\alpha }_{1}{l}_{2}^{2}={\alpha }_{2}{l}_{1}^{2}$                (b) ${\alpha }_{1}^{2}{l}_{2}={\alpha }_{2}^{2}{l}_{1}$

(c) ${\alpha }_{1}{l}_{1}={\alpha }_{2}{l}_{2}$                (c) ${\alpha }_{1}{l}_{2}={\alpha }_{2}{l}_{1}$

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Concept Questions :-

Thermal expansion

(c) According to question,

Coefficient of linear expansion of brass=${\alpha }_{1}$

Coefficient of linear expansion of steel= ${\alpha }_{2}$

Length of brass and steel rods are  respectively.

As given difference in length $\left({l}_{2}-{l}_{1}\right)$ is same for all temperature.

So,                                           ${l}_{2}^{\text{'}}-{l}_{2}^{\text{'}}={l}_{2}-{l}_{1}$

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