Stars appears to move from east to west because

A) all stars move from east to west
B) the earth rotates from west to east
C) the earth rotates from east to west
D) the background of the stars moves from west to east

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Light year is a unit of

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

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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 from the Sun reaches us in nearly

A) 2 minutes
B) 4 minutes
C) 8 minutes
D) 16 minutes

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