Water is used to cool radiators of engines in cars because

If the specific heat of a substance is infinite,it means

Which of the following is the unit of specific heat?

Heat energy at a constant rate is supplied to two substances $P$ and $Q$. If the variation of temperature $(T)$ of the substances with time $(t)$ is as shown in the figure,then select the correct statement.

How much energy in $kJ$ is required to heat $5 \, kg$ of water from $20^oC$ to its boiling point? (Specific heat of water = $4.2 \, kJ \, kg^{-1} \, ^oC^{-1}$)

Which of the following statements is $NOT$ true?