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

Converse of pair production is known as

Question # 2

From the theory of relativity, momentum p of the photon is related to energy as

Question # 3

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 # 4

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

Question # 5

When a platinum wire is heated, it appears white at

Question # 6

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

Question # 7

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 8

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 9

the symbol to be used in relativity problems denotes:

Question # 10

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

Question # 11

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

Question # 12

A particle having mass and charge equal to that of an electron is called:

Question # 13

Compton was awarded Nobel prize in physics in

Question # 14

The special theory of relativity treats problems invoving

Question # 15

When a platinum wire is heated, it appears yellow at

Question # 16

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

Question # 17

Photoelectrons are emitted when ultraviolet light falls on:

Question # 18

Wave nature of particle was proposed by

Question # 19

S.I. unit of planks constant is

Question # 20

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 21

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

Question # 22

the dilation of time applies to the timing processes which are:

Question # 23

The length contraction happens only

Question # 24

The special theory of relativity is based on the

Question # 25

According to the special theory of relativity, time is

Question # 26

Position was discovered by Carl Anderson in

Question # 27

A black body is

Question # 28

When platinum wire is heated, it appears cherry red at

Question # 29

Victor de-Brogile received the Nobel prize in physics in

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
2 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
3 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
4 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
5 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
6 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
7 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
8 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
9 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
10 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates

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