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 R: On heating, the length of the rod increases. In light of the above statements.

choose the correct answer from the options given below:

Options

• A is true but R is false.

• A is false but R is true.

• Both A and R are true but R is NOT the correct explanation of A.

• Both A and R are true and R is the correct explanation of A.

Answer 1

Both A and R are true but R is NOT the correct explanation of A.

Explanation:

As the rod is lying freely so in free expansion, thermal stress = 0, but the length of the rod increases on heating. Statement R is also true but it is not correct reason for A.