Class 9 Physics · Chapter 1 · Test 4

SI Units and Errors

25 MCQs • Practice SI unit conventions, measurement uncertainty, significant figures, scientific notation, measuring instruments, and sources of error strictly from 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 symbol represents the SI unit of length?
- AL
- Bm
- Cmetre
- DM
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Answer: B
The SI unit of length is the metre and its symbol is lowercase m.
Question 2
Which SI unit symbol is written with a capital letter because it is named after a scientist?
- Akg
- Bs
- CKm
- DN
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Answer: D
The newton symbol N is capitalized because the unit is named after a scientist.
Question 3
Which is the correct way to write a measurement of five kilograms?
- A5 kgs
- B5 kg
- C5 Kg
- D5 kilogrammes
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Answer: B
SI unit symbols do not take plural forms so 5 kg is correct.
Question 4
What should normally be placed between a numerical value and its unit symbol?
- AA comma
- BA full stop
- CA space
- DA hyphen
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Answer: C
A space is placed between the numerical value and the unit symbol.
Question 5
What power of ten does the prefix nano represent?
- A10^-3
- B10^-6
- C10^-9
- D10^9
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Answer: C
Nano represents 10^-9.

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