Which set lists only fundamental quantities with their correct SI units?
ALength (km), mass (g), time (s), temperature (K), current (A), amount of substance (mol)
BLength (m), mass (kg), force (N), temperature (K), time (s), energy (J)
CLength (km), mass (kg), temperature (°C), amount of substance (mol), current (A)
DLength (m), mass (kg), time (s), temperature (K), current (A), luminous intensity (Cd)
Answer & Solution
Correct answer: D. Length (m), mass (kg), time (s), temperature (K), current (A), luminous intensity (Cd)
1. Fundamental quantities are the base quantities from which all others are derived.
2. Their SI units are metre, kilogram, second, kelvin, ampere, mole and candela.
3. Force in newtons and energy in joules are derived quantities, not fundamental ones.
4. The SI unit of temperature is the kelvin, not the degree Celsius.
5. The SI units of length and mass are the metre and the kilogram, so kilometres and grams are wrong even though the quantities are right.
_Source: NECTA CSEE 2022 Physics 031, Question 1: Multiple Choice, item (i)_
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