Units and Dimensions Questions

The ratio of the dimensions of Planck's constant and that of the moment of inertia is the dimension of :

The dimensions of $({\mu }_0{ϵ}_0{)}^{-1/2}$ are:

The dimension of $\frac{1}{2}{ϵ}_0{E}^2$, where ${ϵ}_0$ is permittivity of free space and $E$ is electric field, is:

The damping force on an oscillator is directly proportional to the velocity. The units of the constant of proportionality are:

If force ($F$), velocity ($V$) and time ($T$) are taken as fundamental units, then the dimensions of mass are:

Planck's constant ($h$), speed of light in vacuum ($c$) and Newton's gravitational constant ($G$) are three fundamental constants. Which of the following combinations of these has dimension of length?