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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

00:00
Question # 1

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

Question # 2

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

Question # 3

Wien's constant is measured in:

Question # 4

Absolute motion cannot be detected

Question # 5

Victor de-Brogile received the Nobel prize in physics in

Question # 6

According to the special theory of relativity, time is

Question # 7

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

Question # 8

The general theory of relativity treats problems involving

Question # 9

Which one of the following physical quantities changes with relativistic speed

Question # 10

Strictly speaking, the earth is:

Question # 11

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

Question # 12

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 # 13

Wave nature of particle was proposed by

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

A photon is considered to have

Question # 19

When a platinum wire is heated, it appears yellow at

Question # 20

Electromagnetic radiation or photons interact with matter in

Question # 21

A black body is

Question # 22

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

Question # 23

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 24

According to the special theory of relativity

Question # 25

de-Broglies hypthesis was experimentally verified by

Question # 26

The existence of position was predicted by Dirace in

Question # 27

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 28

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

Question # 29

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 30

The photon of radio-waves has energy of about

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
2 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
3 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
4 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
5 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
6 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
7 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
8 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
9 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
10 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

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