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

Electromagnetic radiation or photons interact with matter in

Question # 2

When a platinum wire is heated, it appears orange red at

Question # 3

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 4

the symbol to be used in relativity problems denotes:

Question # 5

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

Question # 6

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

Question # 7

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 8

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

Question # 9

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 10

The existence of position was predicted by Dirace in

Question # 11

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

Question # 12

An inertial frame is that frame in which

Question # 13

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

Question # 14

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

Question # 15

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 16

Which of the following is not an example of intertial frame

Question # 17

The energy of the 4th orbit in hydrogen atom is

Question # 18

The length contraction happens only

Question # 19

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 20

The special theory of relativity treats problems invoving

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

The value of the Stephen's constant for black body radiations is given by

Question # 25

Photoelectrons are emitted when ultraviolet light falls on:

Question # 26

Newton's law of motion do not hold in

Question # 27

According to the special theory of relativity, time is

Question # 28

0.1 kg mass will be equivalent to the energy

Question # 29

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

Question # 30

The concept of direction and position are purely

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
3 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
4 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
5 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
6 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
7 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
8 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
9 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
10 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

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