Class 9 Physics · Chapter 1 · Test 3

Measurement Units and Conversions

25 MCQs • Practice measuring length, mass, time, and volume, SI prefixes, scientific notation, and measurement errors using the provided chapter text.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
Which instrument is suitable for measuring the length of a classroom?
- AMicrometer screw gauge
- BMetre rule
- CMeasuring cylinder
- DSpring balance
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Answer: B
A metre rule can be used to measure length.
Question 2
What is the least count of the metre rule described in the chapter?
- A1 cm
- B1 mm
- C0.1 mm
- D0.01 mm
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Answer: B
The least count of a metre rule is 1 mm.
Question 3
Which error can occur when a scale is viewed from an angle instead of at eye level?
- ARandom error
- BZero error
- CParallax error
- DCalibration error
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Answer: C
Viewing a scale from an angle can cause parallax error.
Question 4
Ten Vernier divisions equal 9 mm. If one main scale division is 1 mm what is the least count?
- A1 mm
- B0.9 mm
- C0.1 mm
- D0.01 mm
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Answer: C
Least count equals 1 mm minus 0.9 mm which is 0.1 mm.
Question 5
What should be done to a Vernier callipers reading when it has a positive zero error?
- AAdd the zero error
- BSubtract the zero error
- CMultiply by the zero error
- DIgnore the zero error
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Answer: B
A positive zero error is subtracted from the observed reading.

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