Question

Assertion: Temperature below 0°C is possible on Celsius scale but on kelvin scale negative temperature is not possible.
Reason: The kelvin scale is related to Celsius scale as K = 0°C + 273.

• A. Both assertion and reason are correct and reason is correct explanation for assertion.
• B. Both assertion and reason are correct but reason is not correct explanation for assertion.
• C. Assertion is correct but reason is incorrect.
• D. Assertion is incorrect but reason is correct.

Answer 1

The correct option is B

Both assertion and reason are correct but reason is not correct explanation for assertion.

The explanation for Assertion statement

• The Kelvin scale is related to Celsius scale as follows: K = 0^∘C + 273.15
• Therefore, temperature below 0^∘C is possible in Celsius scale but in Kelvin scale, negative temperature is not possible because below 0 K atoms would stop moving means they do not possess energy. And since mass and energy are related no energy means no mass.

The explanation for Reason statement

• The Kelvin scale is related to Celsius scale as follows: K = 0^∘C + 273.15.
• We can say that zero degree Celsius is equal to 273.15 Kelvin, Hence we can convert Celsius value to Kelvin by just adding the value by 273.15.

Hence option B is correct.