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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 energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
Question # 2
When a position comes close to an electron they annihilate into photons such that
Question # 3
The idea of quantization of energy was proposed by:
Question # 4
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
Question # 5
As the light shines on the metal surface, the electrons are ejected
Question # 6
When a platinum wire is heated, it appears yellow at
Question # 7
Electromagnetic -radiation means:
Question # 8
The length contraction happens only
Question # 9
The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
Question # 10
A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
Question # 11
If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
Question # 12
If a body reaches a speed equal to the speed of light, then its mass will became
Question # 13
Position was discovered by Carl Anderson in
Question # 14
A photon is considered to have
Question # 15
A non-inertial frame of reference is one, in which
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H HAMZA Shah 21 - Sep - 2021 00 Min 42 Sec 60/60 -
U Umer Usman 10 - Mar - 2024 01 Min 08 Sec 60/60 -
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | 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
|
| 2 | When a platinum wire is heated, it appears yellow at |
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
|
| 3 | In order to produce pair production, a photon must have a energy |
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
|
| 4 | Compton shift refers to: |
A. Photon
B. Meson
C. Proton
D. Positron
|
| 5 | The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is |
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
|
| 6 | The concept of direction and position are purely |
A. absolute
B. relative
C. absolute or relative
D. none of these
|
| 7 | The value of the plank's constant 'h' is given by |
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
|
| 8 | An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is |
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
|
| 9 | Intensity of light determines the: |
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
|
| 10 | A photon is considered to have |
A. Momentum
B. Energy
C. Wavelength
D. All of the above
|
Test Questions
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