Question

Which of the following sets can't enter into the list of fundamental quantities in any system of units?

1)length,mass, velocity

2)length,time and velocity

3)mass ,time and velocity

4)length,time and mass

I think it is the second option because velocity is LT^-1 so there is no chance of putting velocity beside length and time.

Answer 1

You are right.
Because in second case velocity depend on other two quantities. So sets (2) cannot enter into the list of fundamental quantities in any system of units. Also mass is not even related to any quantities in second set. So thats the odd one which cannot be listed as fundamental quantities.

Hope this helps :)