Heat is supplied to a certain homogenous sample of matter, at a uniform rate. Its temperature is plotted against times as shown.

Which of the following conclusions can be drawn?

 Refer to the plot of temperature versus time (Figure) showing the changes in the state of ice on heating (not to scale). Which of the following is correct?

Two metal plates $A$ and $B$ made of same material are placed on a table as shown in the figure. If the plates are heated uniformly, the gaps indicated by $x$ and $y$ in the figure,

A bolt is passed through a pipe and a nut is just tightened. Coefficients of linear expansion for bolt and pipe material are ${\alpha }_b$ and ${\alpha }_p$ respectively. If the assembly is heated then:

$1 \mathrm{g}$ of steam at $100°\mathrm{C}$ melts to how many grams of ice at $0°\mathrm{C}$ ? (Latent heat of ice $=80 \mathrm{cal} {\mathrm{g}}^{-1}$ and latent heat of steam $=540 \mathrm{cal} {\mathrm{g}}^{-1}$)

$2 \mathrm{kg}$ of ice at $-20°\mathrm{C}$ is mixed with $5 \mathrm{kg}$ of water at $20°\mathrm{C}$ in an insulating vessel having a negligible heat capacity. Calculate the final mass of water (in $\mathrm{kg}$) remaining in the container.