Question
How many fundamental units are there 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) is the modern form of the metric system. There are seven fundamental units in the SI system, forming the base upon which all other units are derived. These base units are:
- Length: meter (m)
- Mass: kilogram (kg)
- Time: second (s)
- Electric Current: ampere (A)
- Thermodynamic Temperature: kelvin (K)
- Amount of Substance: mole (mol)
- Luminous Intensity: candela (cd)
Therefore, the correct answer is 7.
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