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 value of threshold frequency for different metals is

Question # 2

According to the special theory of relativity, time is

Question # 3

Momentum is a parameter associated with

Question # 4

The Stephen-Boltzmann law for the black body radiation is given by

Question # 5

0.1 kg mass will be equivalent to the energy

Question # 6

An intertial frame of reference is a frame of reference which is

Question # 7

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 8

A photon is considered to have

Question # 9

When platinum wire is heated, it appears cherry red at

Question # 10

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 11

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 12

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 13

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

Question # 14

When a platinum wire is heated, it appears orange red at

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
2 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
3 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
4 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
5 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
6 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
7 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
8 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
9 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
10 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev

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