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MDCAT Physics Chapter 11 Dawn of modern Physics Online Test MCQs With Answers
Question # 1
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 # 2
Potassium cathode in photocell emits electrons for a light:
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Visible
Infrared
Ultraviolet
X-rays
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Question # 3
Diffraction pattern has also been observed for:
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Proton
Neutron
Hydrogen atom
All of them
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Question # 4
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 # 5
In photoelectric effect, electrons are emitted:
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Slowly
Intermittently
Both (a) & (b)
Instantly
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Question # 6
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 # 7
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 # 8
In a photocell, sodium and potassium emit electrons for:
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Visible light
Infrared light
Ultraviolet light
All of these
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Question # 9
De-Broglie received the Nobel prize in
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1929
1937
1928
1924
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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 incident light
Metal surface
Both frequency of incident light and metal surface
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Question # 11
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 # 12
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 # 13
Photo cells is a device which convert light into:
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Wave nature
Particle nature
Particle wave nature
Dual nature
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Question # 14
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 # 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
In a photocell, cesium coated oxidized silver emits electrons for :
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Visible light
Infrared light
Ultraviolet light
All of these
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Question # 17
Interference and diffraction of light confirms its:
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Particle nature
Dual nature
Wave nature
Electromagnetic nature
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Question # 18
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 # 19
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 # 20
The unit of work function is
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eV
Volt
Farad
Herdz
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