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In International System of Units, the unit of length, mass, time, electric current, temperature, intensity of light and quantity of light and quantity are called:

Correct answer: D. Only b & c

  • A. Derived
  • B. Basic
  • C. Fundamental
  • D. Only b & c

Explanation

In the International System of Units (SI), base units are the fundamental units used to define other units. There are seven SI base units: Meter (m): Base unit for length. Kilogram (kg): Base unit for mass. Second (s): Base unit for time. Ampere (A): Base unit for electric current. Kelvin (K): Base unit for temperature. Mole (mol): Base unit for amount of substance. Candela (cd): Base unit for luminous intensity. Basic unit is another name for base unit.

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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.

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