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Class 9 Physics Thermal Properties of Matter


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Class 9Class 10First YearSecond Year
13.Anironblockofvolume3 m3isheatedsothatitstemperaturechangesfrom25Cto100C.Ifthecoefficientoflinearexpansionofironis11×106C1.Whatwillbethenewvolumeoftheironblockafterheating?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
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

iii.Mercuryisusedasthermometricmaterialbecauseithas(a)uniformthermalexpansion(b)lowfreezingpoint(c)smallheatcapacity(d)alltheabovepropertiesiii. 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.
 8.10  Define latent heat of vaporization.

8.10Definelatentheatofvaporization. 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.
b) Why small gaps are left at the joints of sections of railway tracks? Explain the phenomenon involved in it.

b)Whysmallgapsareleftatthejointsofsectionsofrailwaytracks?Explainthephenomenoninvolvedinit.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.
 8.7 Explain the volumetric thermal expansion.

8.7Explainthevolumetricthermalexpansion. 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}
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}

8.1Encirclethecorrectanswerfromthegivenchoices.i.Waterfreezesat(a)0F(b)32F(c)273 K(d)0 K8.1 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).
5. A fixed temperature at which a pure liquid boils is calleda) melting pointb) freezing pointc) boiling pointd) Both (a) and (b).

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

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