Which of the following is a unit that of force?
$Nm$
$mN$
$nm$
$Ns$
The unit of length, velocity and force are doubled. Which of the following is the correct change in the other units?
What is physical quantity ? Write its types.
Which one of the following is not a unit of young's modulus
Number of base $SI$ units is
Explain supplementary quantities and their unit of $SI$ system.