Which pair contains only derived quantities?
ALength and mass alone
BTime and temperature alone
CForce and energy alone
DCurrent and time alone
Answer & Solution
Correct answer: C. Force and energy alone
1. A derived quantity is built from combinations of the fundamental ones.
2. Force is mass times acceleration, so it derives from mass, length and time.
3. Energy is force times distance, so it derives from the same base quantities.
4. Length, mass, time, temperature, current and luminous intensity are all fundamental.
5. Mixing derived quantities into a list of fundamental ones was the recorded error on this item.
_Source: NECTA CSEE 2022 Physics 031, Question 1: Multiple Choice, item (i)_
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