Question # 1

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

In the equation if f₂ > then

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If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

The most refined form of matter is:

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Smoke

Light

Ice

Fog

The wavelength associated with the protons moving at speed of 40 m/s is.

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7.20 nm

9.02

15.7 nm

17.3 nm

De-Broglie waves are associated with

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Moving charged particles only

Moving neutral particles only

All moving particles

All parties whether in motion or at rest

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

Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

Maximum Compton shift is observed at.

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30^oC

90^oC

45^oC

180^oC

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of.

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90^oC

Zero

120^oC

45^oC

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

Compton's effect is associated with

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gamma rays

Beta rays

X rays

Positive rays

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Physics Fsc Part 2 Chapter 8 Online Test MCQs With Answers

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