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

Wave nature of particle was proposed by

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

Electromagnetic radiation or photons interact with matter in

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

The mass of an object will be doubled at speed

Question # 10

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 11

Which of the following is not an example of intertial frame

Question # 12

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 13

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

Question # 14

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 15

The photon of radio-waves has energy of about

Question # 16

the symbol to be used in relativity problems denotes:

Question # 17

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

Question # 18

The year when A.H. compton was awarded Nobel Prize is:

Question # 19

Due to relative motion of observer and the frame of reference of events, time always:

Question # 20

de-Broglies hypthesis was experimentally verified by

Question # 21

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 22

A photon is considered to have

Question # 23

The concept of direction and position are purely

Question # 24

The energy of a photon is represented by

Question # 25

According to the Max plank, energy is redialed or absorbed in

Question # 26

The value of the plank's constant 'h' is given by

Question # 27

When a platinum wire is heated, it appears dull red at about

Question # 28

The inside cavity of the black body is

Question # 29

Absolute motion cannot be detected

Question # 30

Davision and Germer performed experiment to verify

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
2 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
3 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
4 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
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 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
7 The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
8 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
9 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
10 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above

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