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

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 2

When a platinum wire is heated, it appears white at

Question # 3

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

Question # 4

If a material object moves with the speed of light 'C' its mass becomes

Question # 5

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 6

The value of the plank's constant 'h' is given by

Question # 7

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

Question # 8

According to the special theory of relativity, time is

Question # 9

The special theory of relativity is based on the

Question # 10

Pair production is the phenomenon in which

Question # 11

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 # 12

Position was discovered by Carl Anderson in

Question # 13

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 14

Wave nature of particle was proposed by

Question # 15

The year when A.H. compton was awarded Nobel Prize is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
2 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
3 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
4 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
5 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
6 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
7 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
8 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
9 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
10 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite

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