Multiple choice general knowledge science & technology

Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

  1. Pressure and Young's modules

  2. Planck's constant and Angular momentum

  3. Impulse and moment of force

  4. Force and rate of change of linear momentum
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C Correct answer
Explanation

Impulse has dimensions of force × time = MLT^-1. Moment of force (torque) has dimensions of force × distance = ML^2T^-2. These are fundamentally different. Planck's constant and angular momentum both have ML^2T^-1. Pressure and Young's modulus both have ML^-1T^-2. Force and rate of change of momentum both have MLT^-2.

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