Unit of energy in $SI$ system is
Erg
Calorie
Joule
Electron volt
Temperature can be expressed as a derived quantity in terms of any of the following
The unit of permittivity of free space ${\varepsilon _0}$ is
Hertz is the unit for
The velocity of a particle depends upon the time $t$ according to the equation $v = \sqrt {ab} + bt + \frac{c}{{d + t}}$ The physical quantities which are represented by $a, b, c$ and $d$, are in the following order
Which of the following is not a unit of time