ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

When the atomic particle are moving with velocities approaching that of light:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Davision and Germer performed experiment to verify

Question # 7

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

Question # 8

Wave nature of particle was proposed by

Question # 9

A photon is considered to have

Question # 10

The energy of photon 'E' is proported to

Question # 11

The concept of direction is purely:

Question # 12

The existence of position was predicted by Dirace in

Question # 13

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

Question # 14

When a platinum wire is heated, it appears yellow at

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
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 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
4 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
5 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
6 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
7 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
8 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
9 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
10 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

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