The temperature of a body on the Kelvin scale is found to be $X \; K$. When it is measured by a Fahrenheit thermometer,it is found to be $X \; ^\circ F$. Then $X$ is:

If the two temperatures on the Fahrenheit scale differ by $54^{\circ}\text{F}$, then the difference in temperature on the Celsius scale is (in $^{\circ}\text{C}$)

Maximum density of $H_2O$ is at the temperature

What is called absolute zero temperature?

The pressure of a gas filled in the bulb of a constant volume gas thermometer at temperatures $0^{\circ} C$ and $100^{\circ} C$ are $27.50 \, cm$ and $37.50 \, cm$ of $Hg$ respectively. At an unknown temperature,the pressure is $32.45 \, cm$ of $Hg$. The unknown temperature is ........ $^{\circ} C$.

$A$ calorie is defined as the amount of heat required to raise the temperature of $1 \, g$ of water by $1^{\circ} C$. Under which of the following conditions is this defined?