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MDCAT Physics Chapter 11 Dawn of modern Physics Online Test MCQs With Answers
Question # 1
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 # 2
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 # 3
The photoelectric effect was explained by:
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Einstein
Davison
Hertz
Planck
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Question # 4
The unit of work function is
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eV
Volt
Farad
Herdz
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Question # 5
In a photocell, certain metal emits electrons for :
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Visible light
Infrared light
Ultraviolet light
All of these
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Question # 6
A photo cell is based on:
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Compton effect
Pair production
Photo cell
All of these
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Question # 7
In photoelectric effect, electrons are emitted:
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Slowly
Intermittently
Both (a) & (b)
Instantly
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Question # 8
The reverse process of photo-electric effect is called:
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Pair production
Compton effect
Annihilation of matter
X-rays
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Question # 9
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 # 10
The maximum energy of the photoelectrons depends upon:
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Frequency of incident light
Intensity of incident light
Nature of metal
Both (a) & (c)
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Question # 11
The maximum energy of the photoelectrons can be determined by making the:
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Anode positive
Anode negative
Cathode positive
Both (b) & (c)
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Question # 12
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
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Question # 13
The stopping potential for a certain metal is 10 volt, the max. Energy of emitted electron is:
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10 J
100 J
1.6 × 10-18 J
1.6 × 10-19 J
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Question # 14
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
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Question # 15
The unit Compton wavelength is same as:
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Compton wavelength
Compton frequency
Compton shift
Both (a) & (b)
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Question # 16
Interference and diffraction of light confirms its:
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Particle nature
Dual nature
Wave nature
Electromagnetic nature
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Question # 17
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 # 18
The energy of photon of energy 1 eV is:
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1240 nm
1040 nm
1000 nm
620 nm
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Question # 19
Rest mass energy of electron is:
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1.02 MeV
0.51 MeV
931 MeV
200 MeV
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Question # 20
In photoelectric effect, electrons are emitted with:
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Same energy
Different energies
Both (a) & (b)
Intermittent energies
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