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

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

Question # 2

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

Question # 3

The energy of a photon is represented by

Question # 4

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

Question # 5

the symbol to be used in relativity problems denotes:

Question # 6

The Einstein's changes in length, mass and time are not observed in common life because

Question # 7

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

Question # 8

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

Question # 9

Victor de-Brogile received the Nobel prize in physics in

Question # 10

At the temperature, a body emits radiation which is principally

Question # 11

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 12

Electromagnetic -radiation means:

Question # 13

Electromagnetic radiation or photons interact with matter in

Question # 14

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

Question # 15

A photon is considered to have

Question # 16

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 17

According to the special theory of relativity, a moving clock

Question # 18

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

Question # 19

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 20

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

Question # 21

Strictly speaking, the earth is:

Question # 22

Which of the following is not an example of intertial frame

Question # 23

Wien's constant is measured in:

Question # 24

Pair production is the phenomenon in which

Question # 25

When the atomic particle are moving with velocities approaching that of light:

Question # 26

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

Question # 27

An inertial frame is that frame in which

Question # 28

The value of the plank's constant 'h' is given by

Question # 29

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

Question # 30

Momentum is a parameter associated with

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
2 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
3 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
4 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
5 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
6 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
7 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
8 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
9 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
10 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

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