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. Options: A . &nbspBoth A and R are true and R is the correct explanation of A. B . &nbspBoth A and R are true but R is not the correct explanation of A. C . &nbspA is true but R is false. D . &nbspA is false but R is true. E . &nbspBoth A and are false.

Assertion (A): Alcohol rather than mercury is used in a thermometer to measur

Question

Directions: In each of the questions given below, there are two statements labelled as Assertion (A) and Reason (R). Mark your answer as per the codes provided below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. (e) Both A and are false.

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.

Options:

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

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

C . A is true but R is false.

D . A is false but R is true.

E . Both A and are false.

Answer: Option A
Answer: (a)
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 temperatures.

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