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

00:00
Question # 1

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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The idea of quantization of energy was proposed by:

Question # 8

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

Question # 9

Practically the quantity v/c is always:

Question # 10

The value of threshold frequency for different metals is

Question # 11

Which one of the following physical quantities changes with relativistic speed

Question # 12

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

Question # 13

An inertial frame is that frame in which

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

Momentum is a parameter associated with

Question # 18

The energy of a photon is represented by

Question # 19

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

Question # 20

de-Broglies hypthesis was experimentally verified by

Question # 21

According to the special theory of relativity, time is

Question # 22

The special theory of relativity is based on the

Question # 23

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

Question # 24

Victor de-Brogile received the Nobel prize in physics in

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

The length contraction happens only

Question # 29

When a platinum wire is heated, it appears yellow at

Question # 30

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
2 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
3 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
4 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
5 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
6 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
7 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
8 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
9 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
10 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927

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