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

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

Question # 2

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

Question # 3

According to the special theory of relativity, time is

Question # 4

When a position comes close to an electron they annihilate into photons such that

Question # 5

Wien's constant is measured in:

Question # 6

Which of the following phenomenon proves the particle nature of light

Question # 7

The special theory of relatively treats the problems involving:

Question # 8

The existence of position was predicted by Dirace in

Question # 9

At the temperature, a body emits radiation which is principally

Question # 10

Position was discovered by Carl Anderson in

Question # 11

An intertial frame of reference is a frame of reference which is

Question # 12

When platinum wire is heated, it appears cherry red at

Question # 13

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

Question # 14

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 15

The energy of a photon is represented by

Question # 16

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

Question # 17

The special theory of relativity is based on:

Question # 18

Intensity of light determines the:

Question # 19

The mass of an object will be doubled at speed

Question # 20

The special theory of relativity is based on the

Question # 21

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 22

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

Question # 23

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

Question # 24

The positron was discovered by:

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

Davision and Germer performed experiment to verify

Question # 30

When a platinum wire is heated, it appears yellow at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
2 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
3 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
4 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
5 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
6 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
7 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
8 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
9 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
10 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

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