Compared to a burn due to water at $100^{\circ}C$,a burn due to steam at $100^{\circ}C$ is

If water at $0\,^{\circ}C$ kept in a container with an open mouth is placed in a large evacuated chamber,what will happen?

$A$ solid cube having certain fixed melting and boiling points takes heat from some source. The variation of temperature $\theta$ of the cube with the heat supplied $Q$ is shown in the adjoining graph. The portion $BC$ of the graph represents the conversion of

Liquid oxygen at $50\ K$ is heated to $300\ K$ at a constant pressure of $1\ atm$. The rate of heating is constant. Which of the following graphs represents the variation of temperature with time?

$Assertion :$ Perspiration from the human body helps in cooling the body.
$Reason :$ $A$ thin layer of water on the skin enhances its emissivity.

During an experiment,it takes $10 \text{ minutes}$ to raise the temperature of water from $0 \text{ °C}$ to $100 \text{ °C}$,and then it takes another $55 \text{ minutes}$ for the water to completely convert into steam. The value of the latent heat of vaporization is ....... $\text{cal/g}$.