Question

Directions: In the following question, a statement of assertion is followed by a statement of reason.

Mark the correct choice as:

(A) If both assertion and reason are true and the reason is the correct explanation of assertion.

(B) If both assertion and reason are true but the reason is not the correct explanation of assertion.

(C) If the assertion is true but the reason is false.

(D) If the assertion is false but the reason is true.

Assertion: Water is not used as a barometric liquid.

Reason: Water easily boils off at 100⁰C.

Answer 1

Explanation of Assertion statement:

1. In a barometer, a glass tube is used.
2. In the glass tube, perfectly pure and dry mercury is filled so that no air bubble is left in the tube.
3. Water can not be used as a barometric liquid.

Explanation of Reason statement:

1. As the density of water is 13.6 times less than the density of mercury.
2. It has been found that the atmospheric pressure can support 10.34 m of water.
3. Therefore water can not be used as a barometric liquid.
4. The boiling point of water is 100⁰C means it boils off when its temperature rises to 100⁰C.
5. But the boiling point of a liquid is not a good criterion for the selection of a barometric liquid.

Thus, Assertion and reason both are true, but the reason is not the correct explanation of assertion.

Hence, option (B) is the correct option.