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

Davision and Germer performed experiment to verify

Question # 2

Photoelectric effect takes place with a photon of:

Question # 3

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 4

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

Question # 5

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

Question # 6

The existence of position was predicted by Dirace in

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

A black body is

Question # 11

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

Question # 12

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 13

Strictly speaking, the earth is:

Question # 14

The energy of the 4th orbit in hydrogen atom is

Question # 15

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

Question # 16

The concept of direction and position are purely

Question # 17

The idea of quantization of energy was proposed by:

Question # 18

When a platinum wire is heated, it appears white at

Question # 19

S.I. unit of planks constant is

Question # 20

The special theory of relatively treats the problems involving:

Question # 21

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

Question # 22

The length contraction happens only

Question # 23

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

Question # 24

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

Question # 25

At the temperature, a body emits radiation which is principally

Question # 26

The unit of work function is:

Question # 27

the symbol to be used in relativity problems denotes:

Question # 28

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

Question # 29

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

Question # 30

The energy of a photon is represented by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
2 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
3 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
4 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
5 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
6 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
7 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
8 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
9 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
10 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

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