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MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics
Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics
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Total Questions15
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Time Allowed20
ECAT Physics Chapter 19 Dawn of Modern Physics
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Question # 1
According to Einstein, with the great increase in the speed of the body the relativistic length of the body
Question # 2
Max plank received the Nobel Prize in physics for his discovery of energy quanta in
Question # 3
An inertial frame is that frame in which
Question # 4
In photoelectric effect the energy of ejected electrons depend on
Question # 5
A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
Question # 6
The photon of radio-waves has energy of about
Question # 7
The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
Question # 8
The existence of position was predicted by Dirace in
Question # 9
Pair production is the phenomenon in which
Question # 10
When low energy photon interact with a metal,which of the following effect is likely to be taken place
Question # 11
When platinum wire is heated, then at the temperature of 500 oC, it becomes:
Question # 12
In process of annihilation of matter, the two photons produced move in opposite direction to converse
Question # 13
Compton was awarded Nobel prize in physics in
Question # 14
The Einstein's changes in length, mass and time are not observed in common life because
Question # 15
Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by |
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
|
| 2 | When a high energy photon interact with a metal, which of the following effect is most likely to be taken place |
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
|
| 3 | When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called |
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
|
| 4 | The energy of a photon is represented by |
A. h/c2
B. h/T
C. hc2
D. hf/c2
|
| 5 | The existence of position was predicted by Dirace in |
A. 1920
B. 1925
C. 1930
D. 1928
|
| 6 | Momentum is a parameter associated with |
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
|
| 7 | Compton studied the scattering of x-rays by loosely bound electrons from: |
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
|
| 8 | The Stephen-Boltzmann law for the black body radiation is given by |
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
|
| 9 | Compton was awarded Nobel prize in physics in |
A. 1921
B. 1923
C. 1925
D. 1927
|
| 10 | The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as |
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
|
Test Questions
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