Classes
Class 9Class 10First YearSecond Year
$8.10 Find the temperature of water after passing 5 \mathrm{~g} of steam at 100^{\circ} \mathrm{C} through 500 \mathrm{~g} of water at 10^{\circ} \mathrm{C} . \left(16.2^{\circ} \mathrm{C}\right) (Note: Specific heat of water is 4200 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1} Latent heat of vaporization of water is \left.2.26 \times 10^{6} \mathrm{Jkg}^{-1}\right) .$

$iii. Mercury is used as thermometric material because it has(a) uniform thermal expansion(b) low freezing point(c) small heat capacity(d) all the above properties$

$8.10 Define latent heat of vaporization.$

$b) Why small gaps are left at the joints of sections of railway tracks? Explain the phenomenon involved in it.$

$8.7 Explain the volumetric thermal expansion.$

$8.1 Encircle the correct answer from the given choices.i. Water freezes at(a) 0^{\circ} \mathrm{F} (b) 32^{\circ} \mathrm{F} (c) -273 \mathrm{~K} (d) 0 \mathrm{~K}$

$5. A fixed temperature at which a pure liquid boils is calleda) melting pointb) freezing pointc) boiling pointd) Both (a) and (b).$