Question # 1

Earth orbital speed is.

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10 km/s

20 km/s

30 km/s

40 km/s

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

The number of electrons emitted depends upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

Pair production can take place only when energy of radiation is equal and greater than 1.02 MeV, thus correct option is.

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X rays

Gama rays

Heat Radiation

Ultraviolet rays

All motions are

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Absolute

Uniform

Relative

Variable

An electron miroscope emplys which to one of the following particles?

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Electron ahve a wave nature

Electrons can be focused by an electric field

Electrons can be focused by a magnetic field

All of the above

The materialization of energy take place in the process of.

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Photo electric effect

Compton Effect

Pair production

Annihilationof matter

Einstein was awarded Nobel prize in physics in

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1905

1911

1918

1921

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Physics Fsc Part 2 Chapter 8 Online Test MCQs With Answers

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