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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
Davision and Germer performed experiment to verify
Question # 2
Compton shift refers to:
Question # 3
The energy of a photon is represented by
Question # 4
the symbol to be used in relativity problems denotes:
Question # 5
The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
Question # 6
The year when A.H. compton was awarded Nobel Prize is:
Question # 7
A particle having mass and charge equal to that of an electron is called:
Question # 8
The special theory of relativity is based on the
Question # 9
S.I. unit of planks constant is
Question # 10
In order to produce pair production, a photon must have a energy
Question # 11
The value of the plank's constant 'h' is given by
Question # 12
There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
Question # 13
The existence of position was predicted by Dirace in
Question # 14
Which of the following phenomenon proves the particle nature of light
Question # 15
According to Einstein, with the great increase in the speed of the body the relativistic length of the body
Prepare Complete Set Wise Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics MCQs Online With Answers
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M Maryam afzal Maryam afzal 25 - May - 2024 09 Min 18 Sec 60/60 -
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | When a platinum wire is heated, it appears yellow at |
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
|
| 2 | The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is |
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
|
| 3 | When the atomic particle are moving with velocities approaching that of light: |
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
|
| 4 | 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
|
| 5 | Electromagnetic radiation or photons interact with matter in |
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
|
| 6 | 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
|
| 7 | 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
|
| 8 | As the light shines on the metal surface, the electrons are ejected |
A. slowly
B. instantaneously
C. either of these
D. none of these
|
| 9 | Victor de-Brogile received the Nobel prize in physics in |
A. 1925
B. 1929
C. 1932
D. 1935
|
| 10 | 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
|
Test Questions