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ECAT Physics Chapter 19 Dawn of Modern Physics Online Test MCQs With Answers
Question # 1
Wave nature of particle was proposed by
Choose an answer
Einstein
Plank
De-Brogile
Max well
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Question # 2
According to the Max plank, energy is redialed or absorbed in
Choose an answer
discrete packets
continuous waves
either of them
none of these
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Question # 3
The value of the plank's constant 'h' is given by
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1.6 x 10
-19
J
1.67 x 10
-27
Kg
6.63 x 10
34
Js
6.63 x 10
-34
Js
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Question # 4
The threshold frequency of sodium is 6 x 10
6
MHz. The cut-off wavelength for this metal will be
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500 m
500 nm
500 km
500 cm
None of these
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Question # 5
Electromagnetic radiation or photons interact with matter in
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two distinct ways
three distinct ways
four distinct ways
five distinct ways
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Question # 6
A non-inertial frame of reference is one, in which
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law of inertial is valid
all laws of physics are the same in all frames
a>0 or a<0
a=0
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Question # 7
A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
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1.66 m
1.0 m
0.66 m
2.66 m
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Question # 8
From the theory of relativity, momentum p of the photon is related to energy as
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p = hfc
p = hf/c
p = f(hc,f)
p = cf/h
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Question # 9
The special theory of relatively treats the problems involving:
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Inertial frames of reference
Non-inertial frames
Non-accelerated frame
Botha (A) and (C)
Both (B) and (C)
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Question # 10
The energy of photon 'E' is proported to
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The magnetic field H
The electric field E
Both the electric and magnetic field H and E
Frequency
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Question # 11
The unit of work function is:
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Joule
Electron volt
That of threshold frequency
Both (A) and (B)
None of these
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Question # 12
The positron was discovered by:
Choose an answer
In cosmic radiation
In 1932
By Carl Anderson
All above
By direc
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Question # 13
A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
Choose an answer
1.66 m
1.66 x 10
-10
m
1.66 x 10
-29
cm
1.66 x 10
-29
m
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Question # 14
In the compton's effect, it is found that the wavelength of incident x-rays is
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greater than the wavelength of scattered x-rays
equal to the wavelength of scattered x-rays
less than the wavelength of scattered x-rays
any one of these
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Question # 15
The general theory of relativity treats problems involving
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inertial frame of references
accelerating frame of references
both of these
none of these
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Question # 16
The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
Choose an answer
Wien's constant
Stefen's constnat
Planck's constant
Boltzmann's constant
None of these
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