Question

Which of the following does not have a fundamental unit:
1) Mass
2) Time
3) Force
4) Electric current

Answer 1

Your answer is 3):

F = mass × acceleration

F if derived from fundamental quantity

So, F is derived quantity

Answer 2

Answer = Force:-

$reason \: and \: explanation$

Fundamental units

The units which is used to measure the fundamental quantities is known as fundamental units, which are free from the other units.

Example= [kilogram,Time,Meter,etc...]

Mass,Time

A mass,time is a free from all other physical it comes on the fundamental units but not a fundamental other quantities.

Example=[Area,speed,volume,density.]

Force

Fore is a Derived quantity because it always depends on the fundamental quantities not on fundamental units.

Derived quantity

quantities which are depend on fundamental quantities.

Example= [Area,force, density, volume, etc.. ]

Hence, the answer is force because

Time, force and electric current are fundamental units but mass is a fundamental quantities.