Metals are good conductors of electricity because

A) they contain free electrons
B) the atoms are lightly packed
C) they have high melting point
D) All of the above

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Sound waves in air are

A) transverse
B) longitudinal
C) electromagnetic
D) polarised

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Pick out the scalar quantity

A) force
B) pressure
C) velocity
D) acceleration

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Magnetism at the centre of a bar magnet is

A) minimum
B) maximum
C) zero
D) minimum or maximum

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Let a thin capillary tube be replaced with another tube of insufficient length then, we find water

A) will overflow
B) will not rise
C) depressed
D) change its meniscus

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