Question # 1

A prism splits a beam of white light into its seven constituent colors this is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

In a Millikan's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19 C. The number of excess electrons on the drop is

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3.9

4

4.2

6

In which case dose the potential energy decreases?

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On compressing a spring

On stretching s spring

One moving a body against gravitational force

One the rising of an air bubble in water

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

A point charge Q is placed at the mid-point of a line joining two charges 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

A photocell with a constant p.d of V volt across it illuminated by a point source from a distance of 25 cm. When the source is moved to a distance of 1 m, the electrons emitted by the photocell

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Carry 1/4th their previous energy

Are 1/6th as numerous as before

Are 1/4th as numerous as before

Carry 1/4th their previous momentum

A photoelectric cell converts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

Two masses of 1 g and 4 g are moving with equal kinetic energies The ratio of the magnitudes of their linear moments is:

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4 : 1

√2 : 1

1 : 2

1 : 16

A p-n junction has a thickness of the order of

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1 cm

1 mm

10^-6 cm

10^-12 cm

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