At STP, a rod is hung from a frame as shown in figure leaving a small gap between the rod and floor. The frame and rod system is heated uniformly up to $350 \mathrm{K}$. Then,

The table gives the initial length ${\mathcal{l}}_0$, change in temperature $\Delta T$ and change in length $\Delta \mathcal{l}$ of four rods. Which rod has greatest coefficient of linear expansion?

The amount of heat required to convert $1 \mathrm{g}$ ice at $–10°\mathrm{C}$ into steam at $100°\mathrm{C}$ will be, 

Specific heat of ice & water is $4.2 \mathrm{J} {\mathrm{g}}^{-1} °{\mathrm{C}}^{-1}$,Latent heat of ice is $336 \mathrm{J} {\mathrm{g}}^{-1}$ & steam is $2268 \mathrm{J} {\mathrm{g}}^{-1}$

$2 \mathrm{kg}$ ice at $-20°\mathrm{C}$ is mixed with $5 \mathrm{kg}$ water at $20°\mathrm{C}$. Then final amount of water in the mixture would be;

(Given specific heat of ice $=0.5\mathrm{cal}/\mathrm{g}°\mathrm{C}$, specific heat of water $=1\mathrm{cal}/\mathrm{g}°\mathrm{C}$ and latent heat of fusion of ice $=80\mathrm{cal}/\mathrm{g}$)