Given below are two statements :

Question:

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason $R$.

Assertion $A$ : When a rod lying freely is heated, no thermal stress is developed in it. Reason $\mathrm{R}$ : On heating, the length of the rod increases. In the light of the above statements, choose the corect answer from the options given below :

  1. (1) $\mathrm{A}$ is true but $\mathrm{R}$ is false

  2. (2) Both $A$ and $R$ are true and $R$ is the correct explanation of $A$

  3. (3) Both $A$ and $R$ are true but $R$ is NOT the correct explanation of $A$

  4. (4) $\mathrm{A}$ is false but $\mathrm{R}$ is true

Correct Option: , 3

Solution:

(3)

When a rod is free and it is heated then there is no thermal stress produced in it. The

rod will expand due to increase in temperature. so both a $\backslash \& \mathrm{R}$ are true.

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