The viscous force $F$ acting on a sphere of radius $r$ moving with velocity $v$ through a fluid of viscosity $\eta$ is given by $F = 6\pi \eta rv + kr^2v^2$. The dimensions of $k$ are:

The unit of permittivity of free space ${\varepsilon _0}$ is

Which of the following system of units is not based on units of mass, length and time alone

Which does not have the same unit as others

If the unit of length and force be increased four times, then the unit of energy is

The unit of potential energy is

The unit of angular acceleration in the SI system is

Which of the following cannot be regarded as an essential characteristic of a unit of measurement?

The SI unit of electrochemical equivalent is

The physical quantity which is not a unit of energy is

One is equivalent to 931 MeV energy. The rest mass of electron is $9.1 imes {10^{ - 31}}kg$. the Mass equivalent energy is (1 amu = $= 1.67 imes {10^{ - 17}}kg$)