Chapter 19 Dawn Of Modern Physics Physics 12th Class Punjab MCQ Tests
12th Class Physics Chapter 19 MCQ Tests
Chapter 19 of 12th Class Physics has 30 questions. If you take an online MCQ test, the system will randomly choose the questions. If you want to take the quiz by chapter then click the start test button.
Total Questions: 30
Total Marks: 30
Time: 30 Mins
Total Questions: 30
Total Marks: 30
Time: 30 Mins
30Min : 00 Sec Remaining
Question # 1
In order to observe the position of electron with more accuracy, light of which wavelength should be used?
Question # 2
How the temperature effects the wavelength or frequency of radiations emitted by a black body?
Question # 3
What will happen to the maximum kinetic energy of photoelectrons if the frequency of incident light in a photoelectric experiment is doubled?
Question # 4
Why a tube used to examine photoelectric emission is evacuated?
Question # 5
A boy sitting in one corner of the room watches an insect moving on the adjacent wall. The boy can describe the position of insect on the wall taking his own position as reference point. What is that reference point called?
Question # 6
The stopping potential ( V o ) in photoelectric effect depends on which of the following factors?
Question # 7
In Compton effect, what is the wavelength of the scattered photon as compared to the wavelength of incident x-rays?
Question # 8
You have one kilogram of a coal. If were able to convert this coal completely into energy then what would be the amount of energy you get?
Question # 9
Find
Question # 10
If measurements show a precise position of an electron, can those measurements also show precise momentum?
Question # 11
If S is an inertial frame of reference, then what type of frame of reference is T when it is moving with an acceleration a with respect to S?
Question # 12
The de-Broglie wavelength of an electron is directly proportional to Vn when it is accelerated through a potential difference V. What should n be equal to?
Question # 13
If you could move with speed of light then what would your relativistic mass be?
Question # 14
Why is the rest mass of photon zero?
Question # 15
What is the rest mass of photon?
Question # 16
A clock is moving with a speed of 0.4c where c is the speed of light in vacuum. What will be the behavior of the clock as compared to the identical clock at rest?
Question # 17
A spaceship is moving in space, without spinning and with its engine cut off. What type of frame of reference would it be?
Question # 18
A beam of red light and a beam of blue light have exactly the same energy. Which beam contains the greater number of photons?
Question # 19
In order to reduce uncertainty in momentum, which wavelength of light should be used?
Question # 20
In Davisson-Germer experiment, the diffracted proton from the crystal shows which of the following properties?
Question # 21
Why don't we observe the wavelength for a massive particle?
Question # 22
What is the motion of a free particle in an inertial frame of reference?
Question # 23
Which of the following will be a good absorber of heat radiations?
Question # 24
The length of a rod at rest is 1 m. What is its length when moving with 0.6c?
Question # 25
Solve
Question # 26
What would be the type of frame, if a train moving with uniform velocity is taken as frame of reference?
Question # 27
What is the relativistic mass ( m r e l ) of an electron when compared with its rest mass ( m r e s t )?
Question # 28
The wavelength of which of these objects will be greater? A 140 g ball moving at 40 ms−1 or an electron moving at the same speed?
Question # 29
What is the uncertainty in energy of an electron in excited state, when the lifetime of an electron in an excited state is about?
Question # 30
The photoelectric effect can be explained on the basis of which of the following?
Total Questions
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Question # 1
In order to observe the position of electron with more accuracy, light of which wavelength should be used?
Question # 2
How the temperature effects the wavelength or frequency of radiations emitted by a black body?
Question # 3
What will happen to the maximum kinetic energy of photoelectrons if the frequency of incident light in a photoelectric experiment is doubled?
Question # 4
Why a tube used to examine photoelectric emission is evacuated?
Question # 5
A boy sitting in one corner of the room watches an insect moving on the adjacent wall. The boy can describe the position of insect on the wall taking his own position as reference point. What is that reference point called?
Question # 6
The stopping potential ( V o ) in photoelectric effect depends on which of the following factors?
Question # 7
In Compton effect, what is the wavelength of the scattered photon as compared to the wavelength of incident x-rays?
Question # 8
You have one kilogram of a coal. If were able to convert this coal completely into energy then what would be the amount of energy you get?
Question # 9
Find
Question # 10
If measurements show a precise position of an electron, can those measurements also show precise momentum?
Question # 11
If S is an inertial frame of reference, then what type of frame of reference is T when it is moving with an acceleration a with respect to S?
Question # 12
The de-Broglie wavelength of an electron is directly proportional to Vn when it is accelerated through a potential difference V. What should n be equal to?
Question # 13
If you could move with speed of light then what would your relativistic mass be?
Question # 14
Why is the rest mass of photon zero?
Question # 15
What is the rest mass of photon?
Question # 16
A clock is moving with a speed of 0.4c where c is the speed of light in vacuum. What will be the behavior of the clock as compared to the identical clock at rest?
Question # 17
A spaceship is moving in space, without spinning and with its engine cut off. What type of frame of reference would it be?
Question # 18
A beam of red light and a beam of blue light have exactly the same energy. Which beam contains the greater number of photons?
Question # 19
In order to reduce uncertainty in momentum, which wavelength of light should be used?
Question # 20
In Davisson-Germer experiment, the diffracted proton from the crystal shows which of the following properties?
Question # 21
Why don't we observe the wavelength for a massive particle?
Question # 22
What is the motion of a free particle in an inertial frame of reference?
Question # 23
Which of the following will be a good absorber of heat radiations?
Question # 24
The length of a rod at rest is 1 m. What is its length when moving with 0.6c?
Question # 25
Solve
Question # 26
What would be the type of frame, if a train moving with uniform velocity is taken as frame of reference?
Question # 27
What is the relativistic mass ( m r e l ) of an electron when compared with its rest mass ( m r e s t )?
Question # 28
The wavelength of which of these objects will be greater? A 140 g ball moving at 40 ms−1 or an electron moving at the same speed?
Question # 29
What is the uncertainty in energy of an electron in excited state, when the lifetime of an electron in an excited state is about?
Question # 30
The photoelectric effect can be explained on the basis of which of the following?
Total Questions
123456789101112131415161718192021222324252627282930
Physics MCQ Test by Topics
- +19.1 Relative Motion
- +19.2 Frames of Reference
- +19.3 Special Theory of Relativity
- +19.3 Time Dilation
- +19.3 Length Contraction
- +19.3 Mass Variation
- +19.3 Mass energy relation
- +19.3 NAVSTAR Navigation System
- +19.4 Black Body Radiation
- +19.4 Intensity distribution diagram
- +19.4 Plancks Assumption
- +19.4 The Photon
- +19.5 Interaction of Electromagnetic Radiation With Matter
- +19.5 Photoelectric Effect
- +19.5 Explanation on the Basis of Quantum Theory
- +19.5 Photocell
- +19.5 Compton Effect
- +19.5 Pair Production
- +19.6 Annihilation of Matter
- +19.7 Wave Nature of Particles
- +19.7 Davisson and Germer Experiment
- +19.7 Wave Particle Duality
- +19.7 Uses of Wave Nature of Particles
- +19.7 Electron Microscope
- +19.8 Uncertainty Principle
Physics
12th Class Online Classes 2026
Updated on: 17-05-2026
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