Question

Which among the following is not a dimension?

• A. Time
• B. Kelvin
• C. Length
• D. Mass

Answer 1

Answer: (B)

Kelvin

Answer 2

Dimensions in physics represent fundamental physical quantities. The fundamental dimensions are Length ([L]), Mass ([M]), Time ([T]), Electric Current ([A]), Thermodynamic Temperature ([$\Theta$]), Amount of Substance ([N]), and Luminous Intensity ([J]).

• Time is a fundamental dimension ([T]).
• Length is a fundamental dimension ([L]).
• Mass is a fundamental dimension ([M]).
• Kelvin (K) is the SI unit of Thermodynamic Temperature. While Thermodynamic Temperature is a fundamental dimension ([$\Theta$]), Kelvin itself is a unit, not a dimension.