Pa(Pascal) is the unit for

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

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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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Light year is a unit of

A) time
B) distance
C) light
D) intensity of light

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Siphon will fail to work if

A) the densities of the liquid in the two vessels are equal
B) the level of the liquid in the two vessels are at the same height
C) both its limbs are of unequal length
D) the temperature of the liquids in the two vessels are the same

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