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

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

Question # 2

Wien's constant is measured in:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Which one of the following physical quantities changes with relativistic speed

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

de-Broglies hypthesis was experimentally verified by

Question # 11

If a material object moves with the speed of light 'C' its mass becomes

Question # 12

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 13

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

Question # 14

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

Question # 15

According to the special theory of relativity, a moving clock

Question # 16

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 17

When a platinum wire is heated, it appears yellow at

Question # 18

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 19

Practically the quantity v/c is always:

Question # 20

According to the special theory of relativity

Question # 21

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

Question # 22

The mass of an object will be doubled at speed

Question # 23

According to the special theory of relativity, time is

Question # 24

Compton shift refers to:

Question # 25

The energy of a photon is represented by

Question # 26

The concept of direction and position are purely

Question # 27

Absolute motion cannot be detected

Question # 28

A photon is considered to have

Question # 29

At the temperature, a body emits radiation which is principally

Question # 30

In order to produce pair production, a photon must have a energy

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
2 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
3 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
4 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
5 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
6 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
7 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
8 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
9 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)
10 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White

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