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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
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Question # 1
The special theory of relatively treats the problems involving:
Question # 2
When a position comes close to an electron they annihilate into
Question # 3
A photon is considered to have
Question # 4
Which of the following phenomenon proves the particle nature of light
Question # 5
In order to produce pair production, a photon must have a energy
Question # 6
Pair production is the phenomenon in which
Question # 7
When the atomic particle are moving with velocities approaching that of light:
Question # 8
Strictly speaking, the earth is:
Question # 9
The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
Question # 10
Compton studied the scattering of x-rays by loosely bound electrons from:
Question # 11
According to the de-Brogile relation, an object of large mass and ordinary speed has
Question # 12
An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
Question # 13
The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
Question # 14
When a platinum wire is heated, it appears yellow at
Question # 15
The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
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 | At the temperature, a body emits radiation which is principally |
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
|
| 2 | Which of the following phenomenon proves the particle nature of light |
A. interference
B. diffraction
C. photoelectric effect
D. none of these
|
| 3 | The length contraction happens only |
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
|
| 4 | From the theory of relativity, momentum p of the photon is related to energy as |
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
|
| 5 | The idea of quantization of energy was proposed by: |
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
|
| 6 | The value of the Stephen's constant for black body radiations is given by |
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
|
| 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 | 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
|
| 9 | The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes |
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
|
| 10 | S.I. unit of planks constant is |
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
|
Test Questions
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hasnain
30 May 2018no