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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
Position was discovered by Carl Anderson in
Question # 2
The existence of position was predicted by Dirace in
Question # 3
The special theory of relativity treats problems invoving
Question # 4
The mass of an object will be doubled at speed
Question # 5
The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
Question # 6
The concept of direction and position are purely
Question # 7
Converse of pair production is known as
Question # 8
The value of the plank's constant 'h' is given by
Question # 9
The idea of quantization of energy was proposed by:
Question # 10
According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
Question # 11
With the help of 50 K v electron microscope, a resolution of
Question # 12
A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
Question # 13
The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
Question # 14
Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
Question # 15
When platinum wire is heated, then at the temperature of 500 oC, it becomes:
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | The special theory of relativity is based on: |
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
|
| 2 | Electromagnetic -radiation means: |
A. Photons
B. protons
C. Electrons
D. Mesons
|
| 3 | 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
|
| 4 | 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
|
| 5 | When a platinum wire is heated, it appears yellow at |
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
|
| 6 | Converse of pair production is known as |
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
|
| 7 | The energy of the 4th orbit in hydrogen atom is |
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
|
| 8 | The Nobel Prize on the explanation of photoelectric effect was awarded to: |
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
|
| 9 | 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
|
| 10 | As the light shines on the metal surface, the electrons are ejected |
A. slowly
B. instantaneously
C. either of these
D. none of these
|
Test Questions