The SI system of units comprises of:
Correct answer: D. Seven basic units
- A. Three basic units
- B. Five basic units
- C. Six basic unit
- D. Seven basic units
Explanation
This is the correct answer. The SI system consists of seven base units, which are: Meter (m) - unit of length Kilogram (kg) - unit of mass Second (s) - unit of time Ampere (A) - unit of electric current Kelvin (K) - unit of temperature Mole (mol) - unit of amount of substance Candela (cd) - unit of luminous intensity These seven base units are used to define and derive all other units in the SI system. The combination of these units allows for the consistent measurement of a wide range of physical quantities.
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About Measurements
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.
Practise Measurements
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