A dimensionless body having a phsical quantity varies as `1//r^(2)`, where `r` is distance from the body. This physical quantity may be

The gravitational force on a body inside the surface of the earth varies as ra, where r is the distance from the center of the earth and a is some constant. If the density of the earth is assumed uniform, then -

Do all physical quantities have dimensions? If no, name three physical quantities which are dimensionless.

Do all physical quantities have dimensions ? If no, name three physical quantities which are dimensionless.

Name the physical quantity which causes motion in a body.

The physical quantity having dimension 2 in length is

A : A dimensionless quantity may have unit. R : Two physical quantities having same dimensions, may have different units.

A : A dimensionless quantity may have unit. R : Two physical quantities having same dimensions, may have different units.