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

Pair production is the phenomenon in which

Question # 2

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

Question # 3

In photoelectric effect the energy of ejected electrons depend on

Question # 4

Momentum is a parameter associated with

Question # 5

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

Question # 6

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 7

Wien's constant is measured in:

Question # 8

The inside cavity of the black body is

Question # 9

The special theory of relativity treats problems invoving

Question # 10

The nature of radiations emitted by a hot body depends upon its:

Question # 11

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

Question # 12

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

Question # 13

An inertial frame is that frame in which

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

In order to produce pair production, a photon must have a energy

Question # 18

Due to relative motion of observer and the frame of reference of events, time always:

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 24

the symbol to be used in relativity problems denotes:

Question # 25

Photoelectric effect takes place with a photon of:

Question # 26

The mass of an object will be doubled at speed

Question # 27

0.1 kg mass will be equivalent to the energy

Question # 28

The unit of work function is:

Question # 29

The photon of radio-waves has energy of about

Question # 30

Photoelectrons are emitted when ultraviolet light falls on:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
2 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
3 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
4 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
5 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
6 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
7 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
8 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
9 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
10 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics

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