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MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics
Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics
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Total Questions15
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Time Allowed20
Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics
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Question # 1
The way through which electromagnetic radiations or photons interact with matter depends upon their:
Question # 2
The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
Question # 3
If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
Question # 4
A non-inertial frame of reference is one, in which
Question # 5
Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
Question # 6
Max Planck received the Nobel Prize for his discovery of energy quants in:
Question # 7
As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
Question # 8
When a platinum wire is heated, it appears dull red at about
Question # 9
According to the special theory of relativity
Question # 10
If a body reaches a speed equal to the speed of light, then its mass will became
Question # 11
Due to relative motion of observer and the frame of reference of events, time always:
Question # 12
According to the Max plank, energy is redialed or absorbed in
Question # 13
If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
Question # 14
The existence of position was predicted by Dirace in
Question # 15
Electromagnetic radiation or photons interact with matter in
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M Maryam afzal Maryam afzal 25 - May - 2024 09 Min 18 Sec 60/60 -
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | The value of threshold frequency for different metals is |
A. different
B. same
C. may be different or may be same
D. none of these
|
| 2 | S.I. unit of planks constant is |
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
|
| 3 | The existence of position was predicted by Dirace in |
A. 1920
B. 1925
C. 1930
D. 1928
|
| 4 | If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers |
A. larger
B. shorter
C. equal
D. none of these
|
| 5 | The concept of direction and position are purely |
A. absolute
B. relative
C. absolute or relative
D. none of these
|
| 6 | the symbol to be used in relativity problems denotes: |
A. Dilated time
B. Proper time
C. Life time
D. Half time
|
| 7 | 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
|
| 8 | The mass of an object will be doubled at speed |
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
|
| 9 | When low energy photon interact with a metal,which of the following effect is likely to be taken place |
A. pair production
B. photoelectric
C. Compton effect
D. None of these
|
| 10 | In photoelectric effect the energy of ejected electrons depend on |
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
|
Test Questions