ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 2

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 3

When a platinum wire is heated, it appears dull red at about

Question # 4

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

Question # 5

When a platinum wire is heated, it appears white at

Question # 6

Wave nature of particle was proposed by

Question # 7

In photoelectric effect the energy of ejected electrons depend on

Question # 8

Photoelectrons are emitted when ultraviolet light falls on:

Question # 9

de-Broglies hypthesis was experimentally verified by

Question # 10

Which one of the following physical quantities changes with relativistic speed

Question # 11

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

Question # 12

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 13

The energy of a photon is represented by

Question # 14

The special theory of relativity is based on:

Question # 15

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
2 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
3 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
4 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
5 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
6 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
7 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
8 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
9 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
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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