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MDCAT Physics Chapter 11 Dawn of modern Physics Online Test MCQs With Answers
Question # 1
There is a certain frequency below which no electrons are emitted from the metal surface, this frequency is known as:
Choose an answer
Critical frequency
Threshold frequency
Maximum frequency
Minimum frequency
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Question # 2
Photo cells are used for :
Choose an answer
Security and counting system
Automatic door system
Automatic street lighting
All of these
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Question # 3
A photo cell is based on:
Choose an answer
Compton effect
Pair production
Photo cell
All of these
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Question # 4
The energy of photon of wavelength 620 nm is:
Choose an answer
0.5 eV
1.0 eV
1.5 eV
2.0 eV
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Question # 5
Interference and diffraction of light confirms its:
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Particle nature
Dual nature
Wave nature
Electromagnetic nature
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Question # 6
In order to increase the K.E of ejected photo electrons, there should be an increase in:
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Intensity of radiation
NoneI
Frequency of radiation
Both (b) & (c)
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Question # 7
G.P Thomson revealed:
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Particle nature of electron
Dual nature of electron
Wave nature of electron
Electromagnetic nature of electron
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Question # 8
Joule-second is the unit of:
Choose an answer
Energy
Heat
Planck’s constant
None of these
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Question # 9
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
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Question # 10
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
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Question # 11
In a photocell, certain metal emits electrons for :
Choose an answer
Visible light
Infrared light
Ultraviolet light
All of these
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Question # 12
In a photocell, cesium coated oxidized silver emits electrons for :
Choose an answer
Visible light
Infrared light
Ultraviolet light
All of these
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Question # 13
The unit Compton wavelength is same as:
Choose an answer
Compton wavelength
Compton frequency
Compton shift
Both (a) & (b)
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Question # 14
The dimensions of Planck’s constant “h” are same as that of:
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Momentum
Angular momentum
Work
Torque
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Question # 15
The reverse process of photo-electric effect is called:
Choose an answer
Pair production
Compton effect
Annihilation of matter
X-rays
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Question # 16
Diffraction pattern has also been observed for:
Choose an answer
Proton
Neutron
Hydrogen atom
All of them
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Question # 17
In order to perform experiment, Davisson and Germer used accelerating voltage of:
Choose an answer
54V
120V
220V
400V
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Question # 18
The maximum kinetic energy of emitted photoelectrons depends upon:
Choose an answer
The intensity of incident light
Frequency of incident light
Metal surface
Both frequency of incident light and metal surface
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Question # 19
In photoelectric effect, electrons are emitted:
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Slowly
Intermittently
Both (a) & (b)
Instantly
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Question # 20
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
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Question # 21
Davisson and Germer, in their experiment used:
Choose an answer
Nickle crystal
Lead crystal
Graphite crystal
Glass
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Question # 22
Photoelectric effect and Compton effect prove the:
Choose an answer
Wave nature of light
Particle nature of light
Dual nature of light
Dual nature of light
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Question # 23
The maximum kinetic energy of emitted photoelectrons depends upon:
Choose an answer
The intensity of incident light
Frequency of the incident light
Temperature of the surface
All of above
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Question # 24
In photoelectric effect, electrons are emitted with:
Choose an answer
Same energy
Different energies
Both (a) & (b)
Intermittent energies
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Question # 25
Photo cells is a device which convert light into:
Choose an answer
Wave nature
Particle nature
Particle wave nature
Dual nature
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Question # 26
The energy of photon of wavelength 1240 nm is:
Choose an answer
0.5 eV
1.0 eV
1.5 eV
2.0 eV
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Question # 27
De-Broglie received the Nobel prize in
Choose an answer
1929
1937
1928
1924
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Question # 28
Interference and diffraction confirm:
Choose an answer
Particle nature
Wave nature
Dual nature
None of these
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