Question

Pick the correct statement(s).
Statement I: Wiped markings on a mercury thermometer can be recreated by marking 0°C and 100°C on the scale and dividing it in hundred equal parts.
Statement II: Per degree celsius expansion of mercury is not equal at all temperatures.

• A. Statement I is correct but statement II is incorrect.
• B. Statement II is correct but statement I is incorrect.
• C. Both statements are correct.
• D. Both statements are incorrect.

Answer 1

The correct option is A Statement I is correct but statement II is incorrect.

We can recreate wiped markings on a thermometer by marking 0°C (melting point) and 100°C (boiling point) on the scale.
The scale between 0°C and 100°C needs to be divided in hundred equal divisions to measure all the in-between temperatures.
The expansion per degree celsius in case of mercury is equal at all temperatures. Due to uniform expansion of mercury, the scale can be divided into equal parts.