Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension? A. Pressure and Young’s modules B. Planck’s constant and Angular momentum C. Impulse and moment of force D. Force and rate of change of linear momentum

Pressure and Young's modules
Planck's constant and Angular momentum
Impulse and moment of force
Force and rate of change of linear momentum

The correct answer is C. Impulse and moment of force.

Impulse is a measure of the change in momentum of an object, while moment of force is a measure of the torque exerted on an object. The dimensions of impulse are $MLT^{-1}$, while the dimensions of moment of force are $ML^2T^{-2}$. Therefore, impulse and moment of force do not have identical dimensions.

In more detail, impulse is defined as the product of force and time, $J = Ft$. Force is a vector quantity, so it has both magnitude and direction. The magnitude of force is measured in newtons (N), and the direction of force is indicated by a unit vector. Time is a scalar quantity, so it is measured in seconds (s). Therefore, the dimensions of impulse are $MLT^{-1}$.

Moment of force is defined as the product of force and the perpendicular distance from the line of action of the force to the point of rotation, $M = Fd$. Force is a vector quantity, so it has both magnitude and direction. The magnitude of force is measured in newtons (N), and the direction of force is indicated by a unit vector. The perpendicular distance is a scalar quantity, so it is measured in meters (m). Therefore, the dimensions of moment of force are $ML^2T^{-2}$.

As you can see, the dimensions of impulse and moment of force are not the same. Therefore, impulse and moment of force do not have identical dimensions.