$MLT^{-1}$ represents the dimensional formula of

The dimensional formula of a physical quantity represented by $\frac{e^2}{4 \pi \varepsilon_0 \hbar}$ is (where $e$ is the charge of an electron,$\varepsilon_0$ is the permittivity of free space,and $\hbar$ is the reduced Planck's constant). Note: The expression $\frac{e^2}{4 \pi \varepsilon_0 \hbar}$ is equivalent to the fine-structure constant $\alpha$ multiplied by the speed of light $c$.

Dimensions of the coefficient of viscosity are

The dimensions of $K$ in the equation $W = \frac{1}{2}K{x^2}$ are:

If $G$ is the gravitational constant and $u$ is the energy density,then which of the following quantities has the same dimensions as $\sqrt{uG}$?

The expression $[M{L^2}{T^{ - 2}}]$ represents