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Physical quantities and measurement
6 Class 9 Physics questions with answers and explanations.
Printable worksheet with answer key
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Which of these is a base quantity in the SI system?
- 1 Length
- 2 Force
- 3 Area
- 4 Speed
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Correct answer: Length
Length is one of the seven base quantities. Force, speed and area are derived from base quantities.
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What is the SI unit of time?
- 1 Minute
- 2 Day
- 3 Second
- 4 Hour
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The least count of a metre rule is:
- 1 1 m
- 2 1 mm
- 3 1 cm
- 4 0.1 mm
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Correct answer: 1 mm
A metre rule is marked in millimetres, so its least count is 1 mm.
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The least count of a vernier calliper is usually:
- 1 1 cm
- 2 0.01 cm
- 3 0.001 cm
- 4 0.1 cm
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Correct answer: 0.01 cm
A common vernier calliper reads to 0.01 cm, or 0.1 mm.
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What is 5 kilometres expressed in metres?
- 1 50 m
- 2 50000 m
- 3 5000 m
- 4 500 m
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A screw gauge is mainly used to measure:
- 1 Time
- 2 The temperature of a body
- 3 Very small thickness or diameter, such as a wire
- 4 The mass of a body
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Correct answer: Very small thickness or diameter, such as a wire
A screw gauge measures small lengths such as the diameter of a thin wire with high precision.