Rectifiers are used to convert

A) Direct current to Alternating current
B) Alternating current to Direct current
C) high voltage to low voltage
D) low voltage to high voltage

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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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Nuclear sizes are expressed in a unit named.

A) Fermi
B) angstrom
C) newton
D) tesla

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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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