Question

Which of the following is not a fundamental quantity?

• A. Current
• B. Time
• C. Weight
• D. Length

Answer 1

The correct option is C

Weight

The explanation for correct option:

1. The Fundamental quantity is the independent physical quantity that cannot be expressed in other physical quantities.
2. The seven fundamental quantities are as below:

(a) Length (b) Mass (c) Time (d) Electric current (e) Temperature (f) Amount of substance (g) Luminous intensity.

3. Weight- Weight is not the fundamental quantity as weight is the product of mass and gravity and its SI unit is $newton\left(N\right)$.

The explanation for incorrect option(s):

A: Current - Current is the fundamental quantity and its SI unit is $Ampere$.

B: Time - Time is the fundamental quantity and its SI unit is $second$.

D: Length - Length is the fundamental quantity and its SI unit is a $meter\left(m\right)$.

Hence, (c) is the correct option i.e the weight is not the fundamental quantity.