The pair$(s)$ of physical quantities that have the same dimensions,is (are)

Just as precise measurements are necessary in science,it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain,try to get an upper bound on the quantity):
$(a)$ The total mass of rain-bearing clouds over India during the Monsoon.
$(b)$ The mass of an elephant.
$(c)$ The wind speed during a storm.
$(d)$ The number of strands of hair on your head.
$(e)$ The number of air molecules in your classroom.

If we use permittivity $\varepsilon$,resistance $R$,gravitational constant $G$,and voltage $V$ as fundamental physical quantities,then:

If $F_1, F_2$, and $F_3$ are the relative strengths of the gravitational, the weak nuclear, and the electromagnetic forces respectively, then

Which of the following physical quantities do not have the same dimensions?

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