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

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

Question # 2

The special theory of relativity is based on:

Question # 3

Newton's law of motion do not hold in

Question # 4

Which one of the following physical quantities changes with relativistic speed

Question # 5

The value of threshold frequency for different metals is

Question # 6

The inside cavity of the black body is

Question # 7

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

Question # 8

A black body is

Question # 9

The energy of a photon is represented by

Question # 10

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

Question # 11

S.I. unit of planks constant is

Question # 12

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

Question # 13

Wien's constant is measured in:

Question # 14

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

Question # 15

According to the special theory of relativity, a moving clock

Question # 16

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

Question # 17

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

Question # 18

Compton shift refers to:

Question # 19

0.1 kg mass will be equivalent to the energy

Question # 20

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 # 21

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

Question # 22

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 23

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

Question # 24

An inertial frame is that frame in which

Question # 25

There is no way to detect:

Question # 26

From the theory of relativity, momentum p of the photon is related to energy as

Question # 27

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

Question # 28

The existence of position was predicted by Dirace in

Question # 29

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

Question # 30

The special theory of relativity treats problems invoving

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
2 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
3 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
5 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
6 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
7 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
8 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
9 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
10 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume

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