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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
00:00
Question # 1
A black body is
Question # 2
When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
Question # 3
When a platinum wire is heated, it appears white at
Question # 4
The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
Question # 5
From the theory of relativity, momentum p of the photon is related to energy as
Question # 6
The Nobel Prize on the explanation of photoelectric effect was awarded to:
Question # 7
According to Einstein, with the great increase in the speed of the body the relativistic length of the body
Question # 8
The special theory of relativity is based on:
Question # 9
The energy of photon 'E' is proported to
Question # 10
Which one of the following physical quantities changes with relativistic speed
Question # 11
Which of the following is not an example of intertial frame
Question # 12
As the light shines on the metal surface, the electrons are ejected
Question # 13
Newton's law of motion do not hold in
Question # 14
According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
Question # 15
According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | According to the special theory of relativity, time is |
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
|
| 2 | The concept of direction and position are purely |
A. absolute
B. relative
C. absolute or relative
D. none of these
|
| 3 | When platinum wire is heated, it appears cherry red at |
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
|
| 4 | de-Broglies hypthesis was experimentally verified by |
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
|
| 5 | 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
|
| 6 | According to the special theory of relativity |
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
|
| 7 | When a position comes close to an electron they annihilate into photons such that |
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
|
| 8 | If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is: |
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
|
| 9 | Electromagnetic -radiation means: |
A. Photons
B. protons
C. Electrons
D. Mesons
|
| 10 | Position was discovered by Carl Anderson in |
A. 1920
B. 1925
C. 1928
D. 1932
|
Test Questions
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