Class 9 Physics Unit-9: Thermal Properties of Matter, Solved MCQs With Verified Answers. (Sindh Textbook Board, Jamshoro)

1. Heat is the form of __________________

(a) Pressure
(b) Weight
(c) Energy
(d) All

... Answer is (c) Energy
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2. Heat capacity is the product of mass and __________

(a) Boiling point
(b) Freezing point
(c) Energy
(d) Specific heat of material

... Answer is (d) Specific heat of material
The product of mass and specific heat capacity is called the thermal capacity or heat capacity of an object. C = c.m

3. The amount of heat needed to convert a substance from liquid to gas is called ____________

(a) Heat of Vaporization
(b) Specific heat
(c) latent heat of fusion
(d) All

... Answer is (a) Heat of Vaporization
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4. Thermal energy transfer required per unit mass to increase the temperature by 1°C or 1 K is called _________________

(a) Latent heat of Vaporization
(b) Specific heat capacity
(c) Latent heat of fusion
(d) Thermal capacity

... Answer is (b) Specific heat capacity
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5. A fixed temperature at which a pure liquid boils is called ___________

(a) melting point
(b) freezing point
(c) boiling point
(d) Both (a) and (b).

... Answer is (c) boiling point
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6. The melting point of ice at normal atmospheric pressure is

(a) 0°C
(b) 0K
(c) 100°C
(d) Both (a) and (b)

... Answer is (a) 0°C
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7. Thermal energy transfer required to change a solid into liquid without changing its temperature is called _____________ :

(a) Latent heat of Fusion
(b) latent heat of vaporization
(c) latent heat of boiling
(d) specific heat capacity

... Answer is (a) Latent heat of Fusion
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8. Thermal energy transfer required to change a liquid into a gas without changing its temperature is called _____________.

(a) latent heat of freezing
(b) latent heat of vaporization
(c) latent heat of boiling
(d) latent heat of melting

... Answer is (b) latent heat of vaporization
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9. Evaporation can occur at _____________

(a) freezing point
(b) melting point
(c) boiling point energy
(d) all temperatures

... Answer is (d) all temperatures
Evaporation can occur at all temperatures.

10. Rate of evaporation of a liquid can be increased by __________

(a) increasing humidity
(b) decreasing temperature
(c) increasing its boiling point
(d) decreasing atmospheric pressure

... Answer is (d) decreasing atmospheric pressure
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11. Linear thermal expansion of a solid depends upon _____________

(a) increase in temperature
(b) original length
(c) properties of material
(d) all of these

... Answer is (d) all of these
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