Chapter 8 – Thermal Properties of Matter
Which of the following substances have greater average kinetic energy of its molecules at 10oC?
(a) Steel (b) copper (c) Water (d) Mercury
Ans. Copper
Every thermometer makes use of some property of a material that varies with temperature. Name the property used in:
- Strip thermometers
- Mercury thermometers
Ans. (a) In strip thermometers, colour variation is used.
(b) Uniform thermal expansion of liquids is used in mercury thermometer.
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Ans.
| Specific Heat | Heat capacity |
| · Specific heat of a substance is the amount of heat required to raise the temperature of 1 kg mass of that substance through 1K. · Its unit is Jkg–1K–1 | · Heat capacity of a body is the quantity of thermal energy absorbed by it for one Kelvin (1 K) increase in its temperature. · Its unit is JK–1. |
Give two uses of cooling effect by evaporation.
Ans. i. Evaporation of perspiration helps to cool our body.
ii. In refrigerator evaporation of liquefied gas produces to cooling.
How evaporation differs from vaporization?
Ans.
| Evaporation | Vaporization |
| Evaporation is the changing of a liquid into vapours (gaseous state) from the surface of the liquid without heating it. | The process in which liquid converts into gas at its boiling point is called vaporization. |
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1st mcq is wrong all the bodies do not expands uniformly on heating
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QNO1)Define thermal expansion of solid.