Physics
It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

Newton's second law
Pascal's law
Newton's third law
Law of inertia

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Physics
Lightning is produced when

Clouds strike against impurities in air and the friction burns up these impurities
Similar charges of electricity rush towards each other and then get repelled
Strong opposite charges in different clouds break down the resistance offered by the intervening air
Water vapour produces electricity in the clouds

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

Both suffer the same change in momentum
The metal ball suffers greater change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball
The rubber ball suffers greater change in momentum

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

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

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