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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 general theory of relativity treats problems involving
Question # 2
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 # 3
Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
Question # 4
The unit of work function is:
Question # 5
Pair production is the phenomenon in which
Question # 6
Newton's law of motion do not hold in
Question # 7
The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
Question # 8
The inside cavity of the black body is
Question # 9
The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
Question # 10
According to the special theory of relativity
Question # 11
The energy of photon 'E' is proported to
Question # 12
As the light shines on the metal surface, the electrons are ejected
Question # 13
A black body is
Question # 14
When a position comes close to an electron they annihilate into photons such that
Question # 15
If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
Prepare Complete Set Wise Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics MCQs Online With Answers
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F Farzand Shah Farzand Shah 01 - Jun - 2024 01 Min 03 Sec 60/60 -
D David Navid 28 - Mar - 2024 02 Min 29 Sec 60/60 -
M Maryam afzal Maryam afzal 25 - May - 2024 09 Min 18 Sec 60/60 -
A Arian Ahmed 09 - Mar - 2024 00 Min 27 Sec 55/60 -
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | According to the Max plank, energy is redialed or absorbed in |
A. discrete packets
B. continuous waves
C. either of them
D. none of these
|
| 2 | The Einstein's changes in length, mass and time are not observed in common life because |
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
|
| 3 | Absolute motion cannot be detected |
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
|
| 4 | The energy of a photon is represented by |
A. h/c2
B. h/T
C. hc2
D. hf/c2
|
| 5 | 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 |
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
|
| 6 | Compton shift refers to: |
A. Photon
B. Meson
C. Proton
D. Positron
|
| 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 | Davision and Germer performed experiment to verify |
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
|
| 9 | 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
|
| 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
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hasnain
30 May 2018no