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Assertion (A) Alcohol rather than mercury is used in a thermometer to measure a temperature of - 60 C. Reason (R) Alcohol has a lower freezing point than mercury.

if both A and R are true and R is the correct explanation of A
if both A and R are true and R is not the correct explanation of A
if A is true but R is false
if A is true but R is true

Correct Answer: if both A and R are true and R is the correct explanation of A

Explanation:

We know that, mercury freezes at -39 C, while alcohol freezes at a point far below - 100 C. So, alcohol is used to measure lower temperatures. Similarly, mercury boils at 357 C, while alcohol boils at 78 C. So, mercury is used to measure high temperature.

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