Question

Assertion (A): It is advised not to hold the thermometer by its bulb while reading it.
Reason (R) : If we hold a thermometer by its bulb, the level of mercury in the bulb will get deviated due to the temperature of our hand and this will affect the actual reading.

• A. A is false, but R is true.
• B. A is true, but R is false.
• C. Both A and R are true, but R is not the correct explanation of A.
• D. Both A and R are true and R is the correct explanation of A.

Answer 1

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

While using a clinical thermometer, one of the precautions need to be taken to obtain the appropriate temperature is that we should not to hold the thermometer by its bulb while reading it because, if we hold a thermometer by its bulb, the level of mercury in the bulb will get deviated due to the temperature of our hand. This will affect the actual reading.