Which one of the following is not a fundamental unit?
Correct answer: A. Erg
- A. Erg
- B. Meter
- C. Kelvin
- D. Ampere
Explanation
The erg is not a fundamental unit; it is a derived unit. The erg is a unit of energy and work in the centimeter-gram-second (CGS) system. In the International System of Units (SI), the fundamental unit of energy is the joule (J).
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Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
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