Multiple choice

Which of the following is not a basic unit in the S.I. System?

  1. Ampere

  2. Kelvin

  3. Second

  4. Joule
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The SI base units are: meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity). Joule is a derived unit for energy/work (1 J = 1 kg·m²/s²), not a base unit.

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