Physics
When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler.

Newton's third law of motion
Law of conservation of energy
Law of Inertia
Law of conservation of momentum

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Physics
Stars twinkle because

the distance of the stars from the earth changes with time.
None of these
the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.

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Physics
Isotopes of an element contain

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

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