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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
Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
Question # 2
With the help of 50 K v electron microscope, a resolution of
Question # 3
When a position comes close to an electron they annihilate into
Question # 4
The photon of radio-waves has energy of about
Question # 5
When low energy photon interact with a metal,which of the following effect is likely to be taken place
Question # 6
According to the special theory of relativity, time is
Question # 7
Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
Question # 8
Which of the following is not an example of intertial frame
Question # 9
According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
Question # 10
The existence of position was predicted by Dirace in
Question # 11
The idea of quantization of energy was proposed by:
Question # 12
According to the de-Brogile relation, an object of large mass and ordinary speed has
Question # 13
The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
Question # 14
When a platinum wire is heated, it appears orange red at
Question # 15
The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
Prepare Complete Set Wise ECAT Physics Chapter 19 Dawn of Modern Physics MCQs Online With Answers
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | The special theory of relativity is based on: |
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
|
| 2 | There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as |
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
|
| 3 | The special theory of relatively treats the problems involving: |
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
|
| 4 | The emission of electrons from a metal surface when exposed to light of suitable frequency is called the |
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
|
| 5 | Wien's constant is measured in: |
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
|
| 6 | The special theory of relativity treats problems invoving |
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
|
| 7 | A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is |
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
|
| 8 | If a body reaches a speed equal to the speed of light, then its mass will became |
A. zero
B. very small
C. infinity
D. none of these
|
| 9 | When platinum wire is heated, then at the temperature of 500 oC, it becomes: |
A. Yellow
B. Orange red
C. Dull red
D. White
|
| 10 | The value of the plank's constant 'h' is given by |
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
|
Test Questions
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