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

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

Question # 2

de-Broglies hypthesis was experimentally verified by

Question # 3

There is no way to detect:

Question # 4

Which of the following phenomenon proves the particle nature of light

Question # 5

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

Question # 6

A non-inertial frame of reference is one, in which

Question # 7

The photon of radio-waves has energy of about

Question # 8

The concept of direction is purely:

Question # 9

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

Question # 10

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

Question # 11

When platinum wire is heated, it appears cherry red at

Question # 12

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

Question # 13

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 19

The length contraction happens only

Question # 20

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 21

Photocell is a device which converts

Question # 22

The idea of quantization of energy was proposed by:

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

The inside cavity of the black body is

Question # 27

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

Question # 28

The value of the Stephen's constant for black body radiations is given by

Question # 29

Compton shift refers to:

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
2 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
3 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
4 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
5 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
6 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
7 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
8 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
9 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
10 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference

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