Question # 1

Compton Effect makes the use of the law of conservation of:

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Energy

Momentum

Charge

Both (a) & (b)

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

Photo cells are used for :

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Security and counting system

Automatic door system

Automatic street lighting

All of these

In photoelectric effect, if we increase the frequency of the incident light then of the electrons increased

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Number

K.E

P.E

Frequency

De-Broglie received the Nobel prize in

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1929

1937

1928

1924

A photo cell is based on:

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Compton effect

Pair production

Photo cell

All of these

Rest mass energy of electron is:

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1.02 MeV

0.51 MeV

931 MeV

200 MeV

J.J Thomson finds:

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Particle nature of the electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

A human eye can detect the electromagnetic radiations of the type:

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Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

G.P Thomson revealed:

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Particle nature of electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

Interference and diffraction of light confirms its:

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Particle nature

Dual nature

Wave nature

Electromagnetic nature

The minimum energy required by an electron to eject from metal surface is known as:

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Photo energy

Critical energy

Threshold energy

Work function

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

De-Broglie received the Nobel prize on his work on:

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Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

Joule-second is the unit of:

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Energy

Heat

Planck’s constant

None of these

The energy of photon of wavelength 1240 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

A.H Compton studied the scattering of X-rays by loosely bound electrons from a graph target in:

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1905

1911

19251

1923

Davisson and Germer, in their experiment used:

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Nickle crystal

Lead crystal

Graphite crystal

Glass

Davisson and Germer received the Nobel prize for their work on:

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Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

Which of the particles, electron, proton and neutron moving with same speed has longest wave length?

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Electron

Proton

Neutron

All have same

In a photocell, certain metal emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

In Compton effect, it was considered that X-rays consist of:

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Electrons

Positrons

Photons

All of these

In order to perform experiment, Davisson and Germer used accelerating voltage of:

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54V

120V

220V

400V

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of the incident light

Temperature of the surface

All of above

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

The energy of photon of wavelength 620 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

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MDCAT Physics Chapter 11 Dawn of modern Physics Online Test MCQs With Answers

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