The option that shows three base quantities' units in System International (SI) is
Correct answer: C. Kilogram, metre, and second.
- A. Gram, joule, and second.
- B. Gram, centimetre, and dyne.
- C. Kilogram, metre, and second.
- D. Kilogram, newton, and second.
Explanation
The correct answer is Option C: 'Kilogram, metre, and second'. These are the base units in the SI system for the fundamental quantities of mass, length, and time. Option D is incorrect because 'newton' is a derived unit of force. Options A and B list units that are either derived or belong to the CGS system, which are not considered SI base units.
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Physical quantities combine a numerical value with a unit, and are expressed using SI base units or derived units such as newtons, joules and pascals. The topic covers prefixes, unit conversion, dimensional analysis, significant figures and measurement uncertainty, while distinguishing scalar quantities from vectors where direction matters.
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