ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

Victor de-Brogile received the Nobel prize in physics in

Question # 2

The energy of photon 'E' is proported to

Question # 3

A particle having mass and charge equal to that of an electron is called:

Question # 4

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 5

Wave nature of particle was proposed by

Question # 6

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 7

The nature of radiations emitted by a hot body depends upon its:

Question # 8

Which one of the following physical quantities changes with relativistic speed

Question # 9

de-Broglies hypthesis was experimentally verified by

Question # 10

With the help of 50 K v electron microscope, a resolution of

Question # 11

Photoelectrons are emitted when ultraviolet light falls on:

Question # 12

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 13

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 14

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 15

Position was discovered by Carl Anderson in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
2 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
3 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
4 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
5 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
6 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
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 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
9 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
10 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these

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