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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
A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
Question # 2
There is no way to detect:
Question # 3
The unit of work function is:
Question # 4
The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
Question # 5
When platinum wire is heated, then at the temperature of 500 oC, it becomes:
Question # 6
According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
Question # 7
When a position comes close to an electron they annihilate into photons such that
Question # 8
Which of the following phenomenon proves the particle nature of light
Question # 9
The photon of radio-waves has energy of about
Question # 10
An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
Question # 11
The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
Question # 12
The length contraction happens only
Question # 13
Newton's law of motion do not hold in
Question # 14
When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
Question # 15
S.I. unit of planks constant is
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ECAT Physics Chapter 19 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | The special theory of relativity is based on the |
A. one postulate
B. two postulates
C. three postulates
D. four postulates
|
| 2 | 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
|
| 3 | As the light shines on the metal surface, the electrons are ejected |
A. slowly
B. instantaneously
C. either of these
D. none of these
|
| 4 | 0.1 kg mass will be equivalent to the energy |
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
|
| 5 | When platinum wire is heated, then at the temperature of 500 oC, it becomes: |
A. Yellow
B. Orange red
C. Dull red
D. White
|
| 6 | 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
|
| 7 | S.I. unit of planks constant is |
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
|
| 8 | The unit of work function is: |
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
|
| 9 | There is no way to detect: |
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
|
| 10 | 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
|
Test Questions