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

According to the special theory of relativity, a moving clock

Question # 2

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 3

Victor de-Brogile received the Nobel prize in physics in

Question # 4

Davision and Germer performed experiment to verify

Question # 5

With the help of 50 K v electron microscope, a resolution of

Question # 6

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

Question # 7

When platinum wire is heated, it appears cherry red at

Question # 8

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 9

0.1 kg mass will be equivalent to the energy

Question # 10

Absolute motion cannot be detected

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 16

Compton was awarded Nobel prize in physics in

Question # 17

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 18

The special theory of relativity is based on:

Question # 19

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

Question # 20

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

Question # 21

The energy of a photon is represented by

Question # 22

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 23

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 24

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

Question # 25

Photoelectric effect takes place with a photon of:

Question # 26

When a position comes close to an electron they annihilate into photons such that

Question # 27

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

Question # 28

When a platinum wire is heated, it appears yellow at

Question # 29

When a position comes close to an electron they annihilate into

Question # 30

Newton's law of motion do not hold in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
2 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
3 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
4 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
5 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
7 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
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 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
10 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only

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