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

The special theory of relativity is based on the

Question # 2

The concept of direction is purely:

Question # 3

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

Question # 4

According to the special theory of relativity

Question # 5

The unit of work function is:

Question # 6

the symbol to be used in relativity problems denotes:

Question # 7

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 8

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 9

According to the special theory of relativity, a moving clock

Question # 10

Converse of pair production is known as

Question # 11

Newton's law of motion do not hold in

Question # 12

Which of the following phenomenon proves the particle nature of light

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

Which of the following is not an example of intertial frame

Question # 17

Victor de-Brogile received the Nobel prize in physics in

Question # 18

When platinum wire is heated, it appears cherry red at

Question # 19

The inside cavity of the black body is

Question # 20

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 21

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

Question # 22

In photoelectric effect the energy of ejected electrons depend on

Question # 23

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 24

Photoelectric effect takes place with a photon of:

Question # 25

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

Question # 26

The positron was discovered by:

Question # 27

According to the special theory of relativity, time is

Question # 28

Photoelectrons are emitted when ultraviolet light falls on:

Question # 29

S.I. unit of planks constant is

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
2 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
3 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
4 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
5 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
6 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
7 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
8 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
9 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
10 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always

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