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 momentum
Law of conservation of energy
Law of Inertia

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Water in the pipes freezes and on freezing water expands, so pipes break
The material of which pipes are made contracts due to cold and so breaks
Frost makes the pipes rusty, so they break
None of these

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Physics
When a piece of pure silicon is doped with aluminium, then

The doped silicon piece will become n-type
The doped silicon piece will become p-type
The resistivity of the doped silicon piece will increase
The conductivity of the doped silicon piece will remain the same

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