ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The unit of work function is:

Question # 8

A black body is

Question # 9

Which of the following phenomenon proves the particle nature of light

Question # 10

The concept of direction is purely:

Question # 11

Photoelectrons are emitted when ultraviolet light falls on:

Question # 12

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 13

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

Question # 14

When a platinum wire is heated, it appears white at

Question # 15

Position was discovered by Carl Anderson in

Question # 16

the symbol to be used in relativity problems denotes:

Question # 17

Electromagnetic -radiation means:

Question # 18

The special theory of relativity is based on the

Question # 19

As the light shines on the metal surface, the electrons are ejected

Question # 20

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 21

The special theory of relativity is based on:

Question # 22

When a position comes close to an electron they annihilate into

Question # 23

The mass of an object will be doubled at speed

Question # 24

The value of threshold frequency for different metals is

Question # 25

Pair production is the phenomenon in which

Question # 26

Compton shift refers to:

Question # 27

Absolute motion cannot be detected

Question # 28

Which one of the following physical quantities changes with relativistic speed

Question # 29

According to the special theory of relativity

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
3 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
4 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
5 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
6 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
7 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
8 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
9 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
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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