A thermally insulted vessel contains $150\, g$ of water at $0\,^oC$. Then the air from the vessel is pumped out a adiabatically. A fraction of water turns into ice and the rest evaporates at $0\,^oC$ itself. The mass of evaporated water will be closes to ....... $g$ (Latent heat of vaporization of water $= 2.10 \times10^6\, Jkg^{-1}$ and Laten heat of Fusion of water $ = 3.36 \times10^5\,Jkg^{-1}$ )
$35$
$150$
$130$
$20$
The graph shown in the figure represent change in the temperature of $5 \,\,kg$ of a substance as it abosrbs heat at a constant rate of $42 \,\,kJ min^{-1}$. The latent heat of vapourazation of the substance is ......... $kJ \,kg^{-1}$
On a hot day, placing a cup full of ice water on the table heats up as cup of hot tea on the same table cools down. write the reason.
A substance of mass $m\, kg$ requires a power input of $P$ watts to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time $t$ sec. What is the latent heat of fusion of the substance
At atmospheric pressure, the water boils at $100°C$. If pressure is reduced, it will boil at
A student takes $50\,gm$ wax $($specific heat $= 0.6\, kcal/kg°C)$ and heats it till it boils. The graph between temperature and time is as follows. Heat supplied to the wax per minute and boiling point are respectively