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

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

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Physics
Isotopes of an element contain

equal number of protons and electrons
the same number of protons but different number of neutrons
the same number of neutrons but different number of protons
equal number of nucleons

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