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##### 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).