A lead bullet at $27°C$ just melts when stopped by an obstacle. Assuming that $25\%$ of heat is absorbed by the obstacle, then the velocity of the bullet at the time of striking........ $m/sec$ ($M.P.$ of lead $= 327°C,$ specific heat of lead $= 0.03\, cal/gm°C,$ latent heat of fusion of lead $= 6\, cal/gm$ and $J = 4.2\, joule/cal)$
$410$
$1230$
$307.5$
None of the above
When the pressure on water is increased the boiling temperature of water as compared to $100°C$ will be
What is the effect of pressures on boiling point of water ?
When $M_1$ gram of ice at $-10\,^oC$ (specific heat $= 0.5\, cal\, g^{-1}\,^oC^{-1}$) is added to $M_2$ gram of water at $50\,^oC$, finally no ice is left and the water is at $0\,^oC$. The value of latent heat of ice, in $cal\, g^{-1}$ is
A metallic ball and highly stretched spring are made of the same material and have the same mass. They are heated so that they melt, the latent heat required
Match the followings :
Column $-I$ | Column $-II$ |
$(a)$ Combined existence of liquid-gaseous state of substance. | $(i)$ Sublimation curve |
$(b)$ Combined existence of solid-gaseous state of substance. | $(ii)$ Fusion curve |
$(iii)$ Vaporization curve |