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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
00:00
Question # 1
S.I. unit of planks constant is
Question # 2
The special theory of relativity is based on the
Question # 3
The photoelectric effect, the maximum energy of photoelectrons depends on the
Question # 4
Max Planck received the Nobel Prize for his discovery of energy quants in:
Question # 5
The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
Question # 6
When low energy photon interact with a metal,which of the following effect is likely to be taken place
Question # 7
Electromagnetic radiation or photons interact with matter in
Question # 8
The positron was discovered by:
Question # 9
In process of annihilation of matter, the two photons produced move in opposite direction to converse
Question # 10
A photon is considered to have
Question # 11
According to the de-Brogile relation, an object of large mass and ordinary speed has
Question # 12
The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
Question # 13
When a platinum wire is heated, it appears orange red at
Question # 14
Wien's constant is measured in:
Question # 15
The special theory of relatively treats the problems involving:
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of |
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
|
| 2 | 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: |
A. Smaller
B. Lerger
C. Same
D. Much larger
|
| 3 | 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
|
| 4 | According to Einstein, with the great increase in the speed of the body the relativistic length of the body |
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
|
| 5 | When a platinum wire is heated, it appears white at |
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
|
| 6 | According to the de-Brogile relation, an object of large mass and ordinary speed has |
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
|
| 7 | According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the |
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
|
| 8 | 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
|
| 9 | Converse of pair production is known as |
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
|
| 10 | Wave nature of particle was proposed by |
A. Einstein
B. Plank
C. De-Brogile
D. Max well
|
Test Questions
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hasnain
30 May 2018no