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

The special theory of relativity treats problems invoving

Question # 2

the dilation of time applies to the timing processes which are:

Question # 3

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 4

Which one of the following physical quantities changes with relativistic speed

Question # 5

The concept of direction and position are purely

Question # 6

The general theory of relativity treats problems involving

Question # 7

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

Question # 8

The mass of an object will be doubled at speed

Question # 9

A non-inertial frame of reference is one, in which

Question # 10

When a platinum wire is heated, it appears white at

Question # 11

The value of threshold frequency for different metals is

Question # 12

Wave nature of particle was proposed by

Question # 13

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

Question # 14

The photon of radio-waves has energy of about

Question # 15

According to the special theory of relativity

Question # 16

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 17

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

Question # 18

the symbol to be used in relativity problems denotes:

Question # 19

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

Question # 20

The Stephen-Boltzmann law for the black body radiation is given by

Question # 21

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

Question # 22

S.I. unit of planks constant is

Question # 23

The length contraction happens only

Question # 24

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

Question # 25

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

Question # 26

Position was discovered by Carl Anderson in

Question # 27

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

Question # 28

According to the special theory of relativity, a moving clock

Question # 29

The energy of the 4th orbit in hydrogen atom is

Question # 30

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
2 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
3 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
4 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
5 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
6 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
7 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
8 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
9 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
10 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation

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