Question

Which of the following is a derived unit in the SI system?

• A. Candela
• B. Kelvin
• C. Mol
• D. Coulomb

Hint:

Derived SI units = combinations of base units (e.g., N, J, C). Base units = 7 defined standards (kg, s, m, etc.).

Answer 1

The Correct Option is D

The International System of Units (SI) comprises both base and derived units. The base units are the fundamental quantities, while derived units are combinations of these base units. Let's break down the given options:

• Candela (cd): This is a base unit in the SI system used to measure luminous intensity.
• Kelvin (K): Another base unit, Kelvin is used for measuring thermodynamic temperature.
• Mol (mol): This base unit measures the amount of substance.
• Coulomb (C): Coulomb is a derived unit in the SI system. It measures electric charge and is defined by the equation: 1 Coulomb = 1 Ampere × 1 Second.

The derived unit here is Coulomb, as it is based on the base units of Ampere (A) and Second (s) in the SI system.