Question

The set of physical quantities among the following which are dimensionally different is:

• A. terminal velocity, drift velocity, critical velocity
• B. potential energy, work done, kinetic energy
• C. pressure, stress, rigidity modulus
• D. disintegration constant, frequency, angular velocity
• E. dipole moment, electric flux, electric field

Answer 1

The correct option is E dipole moment, electric flux, electric field

Dipole moment, $\left[P\right]=q\cdot d=ITL$
Electric flux, $\left[\varphi \right]=E\cdot ds=\left[M{L}^3{I}^{-1}{T}^{-3}\right]$
Electric field, $\left[E\right]=\frac{k\cdot q}{r^2}=\left[ML{I}^{-1}{T}^{-3}\right]$.
Hence option D is correct.