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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Nuclear sizes are expressed in a unit named.

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

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out of the following, which is not emitted by radioactive substance?

A) Electrons
B) Electromagnetic radiations
C) Alpha particles
D) Neutrons

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Sound waves in air are

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

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Pa(Pascal) is the unit for

A) thrust
B) pressure
C) frequency
D) conductivity

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