Question
How many base units are given in the SI system?
This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is
7
The International System of Units (SI) has established a total of seven base units, which serve as the foundation for defining all other units of measurement. Each base unit corresponds to a fundamental physical quantity. These base units are:
- Meter (m): the SI unit of length.
- Kilogram (kg): the SI unit of mass.
- Second (s): the SI unit of time.
- Ampere (A): the SI unit of electric current.
- Kelvin (K): the SI unit of thermodynamic temperature.
- Mole (mol): the SI unit for the amount of substance.
- Candela (cd): the SI unit of luminous intensity.
Thus, the correct option is 7 base units in the SI system.
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