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

Converse of pair production is known as

Question # 2

the symbol to be used in relativity problems denotes:

Question # 3

The concept of direction is purely:

Question # 4

The special theory of relativity is based on:

Question # 5

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

Question # 6

When a platinum wire is heated, it appears dull red at about

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

The year when A.H. compton was awarded Nobel Prize is:

Question # 12

In photoelectric effect the energy of ejected electrons depend on

Question # 13

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

Question # 14

The energy of a photon is represented by

Question # 15

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

Question # 16

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

Question # 17

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 18

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

Question # 19

Davision and Germer performed experiment to verify

Question # 20

Intensity of light determines the:

Question # 21

The concept of direction and position are purely

Question # 22

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

Question # 23

Which of the following is not an example of intertial frame

Question # 24

A black body is

Question # 25

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 26

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

Question # 27

The Einstein's changes in length, mass and time are not observed in common life because

Question # 28

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 29

Wien's constant is measured in:

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
2 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
3 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
4 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
5 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
6 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
7 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
8 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
9 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
10 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

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