Question

Assertion (A): Laboratory thermometer cannot be used to measure the temperature of the human body.
Reason (R): The laboratory thermometer has no kink to prevent the mercury from falling back into the bulb after temperature measurement.

• 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.

Answer 1

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

The laboratory thermometer has no kink to prevent the mercury from falling back into the bulb after temperature measurement.
We cannot use laboratory thermometer to measure the temperature of the human body because it will give incorrect reading due to fall of mercury inside the bulb of thermometer.
Therefore, both A and R are true and R is the correct explanation of A.