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

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Question # 1

Which of the following phenomenon proves the particle nature of light

Question # 2

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

Question # 3

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

Question # 4

When a platinum wire is heated, it appears yellow at

Question # 5

The energy of the 4th orbit in hydrogen atom is

Question # 6

Electromagnetic radiation or photons interact with matter in

Question # 7

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 8

The energy of photon 'E' is proported to

Question # 9

The positron was discovered by:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

The photon of radio-waves has energy of about

Question # 14

When platinum wire is heated, it appears cherry red at

Question # 15

Which one of the following physical quantities changes with relativistic speed

Question # 16

The inside cavity of the black body is

Question # 17

Compton was awarded Nobel prize in physics in

Question # 18

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

Question # 19

The concept of direction is purely:

Question # 20

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

Question # 21

In photoelectric effect the energy of ejected electrons depend on

Question # 22

There is no way to detect:

Question # 23

Davision and Germer performed experiment to verify

Question # 24

The special theory of relativity treats problems invoving

Question # 25

Wave nature of particle was proposed by

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

A photon is considered to have

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
3 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
4 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
5 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
6 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
7 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
8 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
9 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
10 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935

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