Physics
Out of the following pairs, which one does not have identical dimension?

Impulse and Momentum
Moment of inertia and moment of a force
Angular momentum and Planck's constant
Work and Torque

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

sand is soft and concreter is hard.
the friction between sand and feet is less than that between concrete and feet.
the sand is grainy but concrete is smooth.
the friction between sand and feet is more than that between concrete and feet.

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