Question

Assertion (A): A radiation X is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid expand.

Reason (R): The radiation X is ultraviolet radiation.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion.

• Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion.

• Assertion (A) is false, but Reason (R) is true.

• Assertion (A) is true, but Reason (R) is false.

Answer 1

Assertion (A) is true, but Reason (R) is false.

Explanation:

The assertion is true because infrared radiation produces a heating effect, causing the mercury to expand rapidly. The reason is false because radiation X is infrared, not ultraviolet.