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

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

Question # 2

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

Question # 3

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

Question # 4

Wave nature of particle was proposed by

Question # 5

The mass of an object will be doubled at speed

Question # 6

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

Question # 7

When a position comes close to an electron they annihilate into

Question # 8

With the help of 50 K v electron microscope, a resolution of

Question # 9

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

Question # 10

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

Question # 11

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 12

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 13

If a material object moves with the speed of light 'C' its mass becomes

Question # 14

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

Question # 15

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

Question # 16

When platinum wire is heated, it appears cherry red at

Question # 17

An inertial frame is that frame in which

Question # 18

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

Question # 19

Momentum is a parameter associated with

Question # 20

Compton was awarded Nobel prize in physics in

Question # 21

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

Question # 22

The length contraction happens only

Question # 23

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 # 24

Absolute motion cannot be detected

Question # 25

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

Question # 26

Davision and Germer performed experiment to verify

Question # 27

Converse of pair production is known as

Question # 28

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

Question # 29

At the temperature, a body emits radiation which is principally

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
3 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
4 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
5 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
6 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
7 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
8 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
9 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:
A. Smaller
B. Lerger
C. Same
D. Much larger
10 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero

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