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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
The special theory of relativity is based on the
Question # 2
The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
Question # 3
Which of the following is not an example of intertial frame
Question # 4
Absolute motion cannot be detected
Question # 5
At the temperature, a body emits radiation which is principally
Question # 6
When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
Question # 7
Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
Question # 8
The mass of an object will be doubled at speed
Question # 9
the symbol to be used in relativity problems denotes:
Question # 10
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 # 11
Position was discovered by Carl Anderson in
Question # 12
Victor de-Brogile received the Nobel prize in physics in
Question # 13
A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
Question # 14
Compton shift refers to:
Question # 15
A non-inertial frame of reference is one, in which
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be |
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
|
| 2 | The way through which electromagnetic radiations or photons interact with matter depends upon their: |
A. Wavelength
B. Frequency
C. Energy
D. Temperature
|
| 3 | 0.1 kg mass will be equivalent to the energy |
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
|
| 4 | Electromagnetic -radiation means: |
A. Photons
B. protons
C. Electrons
D. Mesons
|
| 5 | The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by |
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
|
| 6 | When platinum wire is heated, then at the temperature of 500 oC, it becomes: |
A. Yellow
B. Orange red
C. Dull red
D. White
|
| 7 | Max Planck received the Nobel Prize for his discovery of energy quants in: |
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
|
| 8 | 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)
|
| 9 | 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
|
| 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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