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JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER
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Medium
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Understanding
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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 (R) On heating, the length of rod increases.
In the light of the above statements, choose the correct answer from the options given below
Assertion (A) When a rod lying freely is heated, no thermal stress is developed in it.
Reason (R) On heating, the length of rod increases.
In the light of the above statements, choose the correct answer from the options given below
View answer and explanation
Correct option: A
Both A and R are true but R is not the correct explanation of A.
Option A is correct because while heating a rod increases its length, thermal stress only develops if the rod is constrained.
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