Question

On the Celsius scale, the absolute zero temperature is at ___.

• A. 0°C
• B. - 32°C
• C. 100°C
• D. - 273.15°C

Answer 1

The correct option is D

- 273.15°C

The absolute zero temperature in Kelvin scale is $0K$.
Let $K$ be the temperature in kelvin and $C$ be the temperature in degree Celsius.
We know, $K=273+C$
$\Rightarrow 0=273+C\Rightarrow C=-273{}^{\circ }C$
Therefore, on the Celsius scale, absolute zero temperature is at $-273{}^{\circ }C$