Class 9 Physics · Chapter 7 · Test 4
Thermal Applications and Revision
51 MCQs
51 questions · 40 min · 51 marks
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Sample questions
The first 5 of 51. Try each one, then tap to see the answer.
Question 1
How do particles in a solid move?
- AThey move freely in all directions
- BThey vibrate about their mean positions
- CThey move far apart continuously
- DThey remain completely motionless
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Answer: B
Particles in solids vibrate about fixed mean positions.
Question 2
What type of motion is associated with gas molecules?
- AOnly vibration at fixed points
- BNo motion
- CRandom motion
- DMotion in fixed rows
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Answer: C
Gas molecules move randomly in the available space.
Question 3
Temperature is the measure of the degree of:
- AMass of a body
- BHotness or coldness of a body
- CInternal volume only
- DDensity of a body
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Answer: B
Temperature indicates the degree of hotness or coldness.
Question 4
Heat is best described as:
- AEnergy transferred due to a temperature difference
- BThe total mass of molecules
- CThe temperature of a body
- DEnergy stored only in a thermometer
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Answer: A
Heat is energy in transit between bodies at different temperatures.
Question 5
What is the Kelvin temperature of melting ice approximately?
- A100 K
- B273 K
- C373 K
- D32 K
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Answer: B
The melting point of ice is approximately 273 K.
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