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MDCAT Physics Chapter 11 Dawn of modern Physics Online Test MCQs With Answers
Question # 1
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 # 2
The number of electrons emitted depend upon
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Colour of target surface
Shape of surface
Frequency of incident light
Intensity of incident light
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Question # 3
Interference and diffraction confirm:
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Particle nature
Wave nature
Dual nature
None of these
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Question # 4
Moving photons posses:
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Energy
Momentum
Wavelength
All of these
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Question # 5
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 # 6
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 # 7
De-Broglie received the Nobel prize in
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1929
1937
1928
1924
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Question # 8
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 # 9
Photoelectric effect and Compton effect prove the:
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Wave nature of light
Particle nature of light
Dual nature of light
Dual nature of light
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Question # 10
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 # 11
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
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Question # 12
Diffraction pattern has also been observed for:
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Proton
Neutron
Hydrogen atom
All of them
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Question # 13
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
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Question # 14
Compton Effect makes the use of the law of conservation of:
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Energy
Momentum
Charge
Both (a) & (b)
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Question # 15
Joule-second is the unit of:
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Energy
Heat
Planck’s constant
None of these
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Question # 16
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 # 17
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 # 18
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 # 19
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
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Question # 20
In photoelectric effect, electrons are emitted:
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Slowly
Intermittently
Both (a) & (b)
Instantly
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Question # 21
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 # 22
In Compton effect, it was considered that X-rays consist of:
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Electrons
Positrons
Photons
All of these
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Question # 23
The unit of work function is
Choose an answer
eV
Volt
Farad
Herdz
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Question # 24
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 # 25
Photo cells are used for :
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Security and counting system
Automatic door system
Automatic street lighting
All of these
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Question # 26
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 # 27
Interference and diffraction of light confirms its:
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Particle nature
Dual nature
Wave nature
Electromagnetic nature
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Question # 28
In order to perform experiment, Davisson and Germer used accelerating voltage of:
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54V
120V
220V
400V
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