Question

Which of the following Physical quantity is a fundamental physical quantity?

• A. Volume
• B. Speed
• C. Area
• D. Length

Answer 1

The correct option is D

Length

Explanation of correct option

(D) - length

1. Length is one fundamental quantity among the seven.
2. Length is the distance between two points.
3. Its SI unit is metre.

Explanation of incorrect option.

Option(A)

1. Volume is a derived quantity since it is derived from the length.
2. $volume=length\times breadth\times height$
3. Its unit is $m^3$

Option (B)

1. Speed is another derived unit.
2. $Speed=\frac{dis\tan ce}{time}$.
3. Its unit is$m/s$.

Option (C)

1. Area is also a derived quantity.
2. $Area=length\times breadth$
3. Its unit is $m^2$.

Hence option (D) is correct