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Thermal properties of matter
6 Class 9 Physics questions with answers and explanations.
Printable worksheet with answer key
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What is the freezing point of pure water on the Celsius scale?
- 1 0 degrees C
- 2 100 degrees C
- 3 273 degrees C
- 4 32 degrees C
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Correct answer: 0 degrees C
Pure water freezes at 0 degrees C under normal pressure.
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What is 0 degrees C on the Kelvin scale?
- 1 0 K
- 2 273 K
- 3 373 K
- 4 100 K
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The heat needed to raise 1 kg of a substance by 1 K is its:
- 1 Thermal expansion
- 2 Heat flow
- 3 Specific heat capacity
- 4 Latent heat
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Correct answer: Specific heat capacity
This is the definition of specific heat capacity.
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How much heat is needed to raise 2 kg of water by 10 K? (specific heat of water = 4200 J/kg K)
- 1 84000 J
- 2 8400 J
- 3 4200 J
- 4 42000 J
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Which state of matter expands the most for the same rise in temperature?
- 1 Liquids
- 2 All expand equally
- 3 Solids
- 4 Gases
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Correct answer: Gases
Gases expand much more than liquids, and liquids more than solids.
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The heat absorbed when a liquid changes to gas at constant temperature is called:
- 1 Latent heat of vaporisation
- 2 Latent heat of fusion
- 3 Specific heat
- 4 Sensible heat
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Correct answer: Latent heat of vaporisation
Changing from liquid to gas at its boiling point uses the latent heat of vaporisation.