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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Sound waves in air are

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

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Of the following properties of a wave, the one that is independent of the other is its

A) amplitude
B) velocity
C) wavelength
D) frequency

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Pa(Pascal) is the unit for

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

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Radiocarbon is produced in the atmosphere as a result of

A) collision between fast neutrons and nitrogen nuclei present in the atmosphere
B) action of ultraviolet light from the sun on atmospheric oxygen
C) action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
D) lightning discharge in atmosphere

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