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Class 9Class 10First YearSecond Year
$13. An iron block of volume 3 \mathrm{~m}^{3} is heated so that its temperature changes from 25^{\circ} \mathrm{C} to 100^{\circ} \mathrm{C} . If the coefficient of linear expansion of iron is 11 \times 10^{-6}{ }^{\circ} \mathrm{C}^{-1} . What will be the new volume of the iron block after heating ?$

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

$8.10 Define latent heat of vaporization.$

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

$8.7 Explain the volumetric thermal expansion.$

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

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