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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
Intensity of light determines the:
Question # 2
The energy of photon 'E' is proported to
Question # 3
A photon is considered to have
Question # 4
The photon of radio-waves has energy of about
Question # 5
The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
Question # 6
If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
Question # 7
The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
Question # 8
The positron was discovered by:
Question # 9
The value of the plank's constant 'h' is given by
Question # 10
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 # 11
According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
Question # 12
Photoelectric effect takes place with a photon of:
Question # 13
The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
Question # 14
The Stephen-Boltzmann law for the black body radiation is given by
Question # 15
Which one of the following physical quantities changes with relativistic speed
Prepare Complete Set Wise Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics MCQs Online With Answers
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | Compton shift refers to: |
A. Photon
B. Meson
C. Proton
D. Positron
|
| 2 | The value of threshold frequency for different metals is |
A. different
B. same
C. may be different or may be same
D. none of these
|
| 3 | the symbol to be used in relativity problems denotes: |
A. Dilated time
B. Proper time
C. Life time
D. Half time
|
| 4 | Which of the following phenomenon proves the particle nature of light |
A. interference
B. diffraction
C. photoelectric effect
D. none of these
|
| 5 | de-Broglies hypthesis was experimentally verified by |
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
|
| 6 | In the compton's effect, it is found that the wavelength of incident x-rays is |
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
|
| 7 | 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
|
| 8 | 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
|
| 9 | 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
|
| 10 | Wien's constant is measured in: |
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
|
Test Questions
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hasnain
30 May 2018no