In the SI system, how many base units are there?
Correct answer: C. Seven
- A. Three
- B. Five
- C. Seven
- D. Nine
Explanation
The number of fundamental units of measurement in science is typically considered to be seven. These are the basic units from which all other units can be derived. The seven SI (International System of Units) base units are: Meter (m): This unit represents length or distance. Kilogram (kg): This unit represents mass. Second (s): This unit represents time. Ampere (A): This unit represents electric current. Kelvin (K): This unit represents temperature. Mole (mol): This unit represents amount of substance. Candela (cd): This unit represents luminous intensity.
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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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