Physics Units, Dimensions and Measurement Units Single Correct MCQ
Published on: September 12, 2026

Number of base SI units is

A
4
B
7
C
3
D
5

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Text Solution

Verified by Experts
The correct answer is:
B
Step 1: Understanding base SI units. The International System of Units (SI) defines a set of base units, which serve as the foundation for all other measurements.
Step 2: The current system acknowledges seven base units:
  • Meter (m) for length
  • Kilogram (kg) for mass
  • Second (s) for time
  • Ampere (A) for electric current
  • Kelvin (K) for temperature
  • Mol (mol) for the amount of substance
  • Candela (cd) for luminous intensity
Step 3: Therefore, the number of base SI units is 7.
Therefore, the correct answer is B.

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