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Class 11 Physics MCQ Questions of Physical World with Answers?

Answer 1

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Practice MCQ Questions for class 11 Physics Chapter-Wise

1. Atomic and molecular phenomena are dealt with by

(a) Newtonian Mechanics
(b) fluid Mechanics
(c) applied Mechanics
(d) Quantum Mechanics

2. Wave picture of light failed to explain.

(a) the photoelectric effect
(b) polarization of light
(c) diffraction of light
(d) interference of light

3. Which of the following is a possible first step in applying the scientific method

(a) Conducting tests
(b) Formulating a hypothesis
(c) Formulation of a question
(d) Building a theory

4. Newtonian mechanics could not explain

(a) fall of bodies on earth
(b) Some of the most basic features of atomic phenomena
(c) movement of planets
(d) flight of rockets

5. Macroscopic domain includes

(a) phenomena at the laboratory
(b) terrestrial scales
(c) astronomical scales
(d) All of the above

6. The man who is known as the Father of Experimental Physics is

(a) Newton
(b) Albert Einstein
(c) Galileo
(d) Rutherford

7. The person who has been awarded the title of the Father of Physics of 20th century is

(a) Madame Curie
(b) Sir C.V. Raman
(c) Neils Bohr
(d) Albert Einstein

8. Assertion: The concept of energy is central to Physics and expression for energy can be written for every physical system.

Reason: Law of conservation of energy is not valid for all forces and for any kind of transformation between different forms of energy.

(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d)  Assertion is incorrect, reason is correct.

9. The scientific principle involves in production of ultra high magnetic fields is

(a) super conductivity
(b) Sir C.V. Raman
(c) photoelectric effect
(d) laws of thermodynamics

10. Louis de-Broglie is credited for his work on

(a) matter waves
(b) law of distribution of velocities
(c) electromagnetic theory
(d) theory of relativity

11. The exchange particles for the electromagnetic force are

(a) photons
(b) gravitons
(c) gluons
(d) mesons

12. Which of the following is the weakest force?

(a) Gravitational force
(b) None of these
(c) Nuclear force
(d) Electromagnetic force

13. When we hold a book in our hand, we are balancing the gravitational force on the book due to

(a) normal force provided by our hand
(b) friction force provided by our book
(c) both
(d) None of these

14. The field of work of S. Chandrashekar is

(a) theory of black hole
(b) theory of relativity
(c) Cosmic rays
(d) X-rays

15. Who discovered X-rays?

(a) Roentgen
(b) Madam Curie
(c) Chadwick
(d) Thomson

16. Who gave general theory of relativity?

(a) Einstein
(b) Madam Curie
(c) Chadwick
(d) Thomson

17. Which of the following is wrongly matched?

(a) Humidity-Calorimeter
(b) Coulomb’s law-charges
(c) Lactometer-Milk
(d) Barometer-Pressure

18. Light year is a unit of

(a) Time
(b) Mass
(c) Distance
(d) Energy

19. Newton–second is the unit of  

(a) Velocity
(b) Angular momentum
(c) impulse
(d) Energy

20. The unit of power is : 

(a) Joule
(b) Joule per second only
(c) Joule per second and watt both
(d) watt

21. Unit of energy in SI system is 

(a) Erg
(b) Calorie
(c) Joule
(d) Electron volt

22. A cube has a numerically equal volume and surface area. The volume of such a cube is :

(a) 216 unit
(b) 1000 units
(c) 2000 unit
(d) 3000 unit

23. The unit of self inductance of a coil is 

(a) Farad
(b) Henry
(c) Weber
(d) Tesla

24. In which of the following systems of the unit, Weber is the unit of magnetic flux?

(a) CGS
(b) MKS
(c) SI
(d) None of these

25. If the unit of length and force be increased four times, then the unit of energy is 

(a) Increased 4 times
(b) Increased 8 times
(c) Increased 16 times
(d) Decreased 16 times

Answer 2

1. Answer: (d) Quantum Mechanics

Explanation: Quantum Mechanics describes the properties of atoms and molecules.

2. Answer: (a) the photoelectric effect

Explanation: The wave theory of light considers light to be a wave with a certain wavelength, frequency, and speed. According to this, the intensity of the light wave is dependent upon its amplitude. Hence, the wave theory of light cannot explain the photoelectric and Compton effect.

3. Answer: (c) Formulation of a question

Explanation: The first step in the Scientific Method is to make objective observations. These observations are based on specific events that have already happened and can be verified by others as true or false.

4. Answer: (b) Some of the most basic features of atomic phenomena

Explanation: Newtonian mechanics could explain fall of bodies using of motion. Movement of planets using Kepler's law which are derived from Newtonian mechanics.  But Newtonian mechanics fails to explain even basic features of atomic phenomena.

5. Answer: (d) All of the above

Explanation: Macroscopic domain includes phenomena at laboratory, terrestrial and astronomical scales.

6. Answer: (c) Galileo

Explanation: Galileo Galilei pioneered the experimental scientific method and was the first to use a refracting telescope to make important astronomical discoveries. He is often referred to as the “father of modern astronomy” and the “father of modern physics”.

7. Answer: (d) Albert Einstein

Explanation: Out of all the experts, it was Albert Einstein who was awarded the title of the father of physics of the 20th century because of his work on the kinetics of nature and the universe and apart from that, he also contributed heavily to the three laws of motion and gravity.

8. Answer: (c) Assertion is correct, reason is incorrect

Explanation: Expression for energy can be written for every physical system because each and every system has some energy that could be defined in a particular manner, on other hand, the law of conservation of energy is a universal law and it states that energy can neither be created nor destroyed. SO, this law is also applicable to each and every physical system.

9. Answer: (a) super conductivity

Explanation: The application of a sufficiently strong magnetic field to a superconductor will, in general, destroy the superconducting state. Two mechanisms are responsible for this. The first is the Zeeman effect which breaks apart the paired electrons if they are in a spin-singlet (but not a spin-triplet) state. The second is the so-called 'orbital' effect, whereby the vertices penetrate into the superconductors and the energy gain due to the formation of the paired electrons is lost. Hence, if we have more conductivity it will be easier for the production of ultra magnetic fields.

10. Answer: (a) matter waves

Explanation: De Broglie, in his 1924 PhD thesis, proposed that just as light has both wave-like and particle-like properties, electrons also have wave-like properties. Here he worked on matter waves.

11. Answer: (a) photons

Explanation: The electrostatic repulsion between two protons is caused by the exchange of virtual photons, which are the exchange particles of the electromagnetic force.

12. Answer: (a) Gravitational force

Explanation: Gravity is a very, very weak force. In a hydrogen molecule it pulls the two protons together with a force about 36 powers of ten weaker than the electric force between them.
Therefore, on small scales (within an atom/molecule), the other forces are much stronger, but on larger scales, it seems that gravity is a far stronger force; e.g. planets are held to the sun by gravity. 

13. Answer: (a) normal force provided by our hand

Explanation: When we hold a book in our hand, we are balancing the gravitational force on the book due to the huge mass of the earth by the 'normal force' provided by our hand. The latter is nothing but the net electromagnetic force between the charged constituents of our hand and the book, at the surface in contact.

14. Answer: (a) theory of black hole

Explanation: A black hole is an invisible mass with a gravity pull so strong that light cannot escape. Black holes are stars that have burned out and compressed. The pull is strong due to the compactness of the mass. Black holes vary from one atom in size to the size of more than 4 million of the Earth's Sun. This black hole theory was discovered by S. Chandrashekar.

15. Answer: (a) Roentgen

Explanation: W.C. Röntgen reported the discovery of X-rays in December 1895 after seven weeks of assiduous work during which he had studied the properties of this new type of radiation able to go through screens of notable thickness. He named them X-rays to underline the fact that their nature was unknown.

16. Answer: (a) Einstein

Explanation: More than 100 years after Albert Einstein published his iconic general theory of relativity, it is beginning to fray at the edges, said Andrea Ghez, UCLA professor of physics and astronomy.

17. Answer: (a) Humidity-Calorimeter

Explanation: Calorimeter is used to measure the heat. Hence it has no relation with humidity.

18. Answer: (c) Distance

Explanation: A light-year is a measurement of distance and not time (as the name might suggest). A light-year is the distance a beam of light travels in a single Earth year, or 6 trillion miles (9.7 trillion kilometers). 

19. Answer: (c) impulse

Explanation: The newton-second (also newton second; symbol: N⋅s or N s) is the derived SI unit of impulse. It is dimensionally equivalent to the momentum unit kilogram-metre per second (kg⋅m/s).

20. Answer: (d) watt

Explanation: Power (P) is the rate at which energy is transferred or converted. Thus, power equals work divided by time (P = W / t). The SI unit of power is the watt (W).

21. Answer: (c) Joule

Explanation: Energy is defined via work, so the SI unit of energy is the same as the unit of work – the joule (J), named in honour of James Prescott Joule and his experiments on the mechanical equivalent of heat.

22. Answer: (a) 216 unit

Explanation: Let a be the edge of the cube. 

∴ a³ = 6a²

or a = 6

Also, volume of the cube = a³ = 216 unit.

23. Answer: (b) Henry

Explanation: The henry (symbol: H) is the SI derived unit of electrical inductance. If a current of 1 ampere flowing through a coil produces flux linkage of 1 weber turn, that coil has a self inductance of 1 henry.

24. Answer: (c) SI

Explanation: Weber is the SI unit of magnetic flux in SI system.

25. Answer: (c) Increased 16 times

Explanation: Since unit of energy = (unit of force).(unit of length) so if we increase unit of length and force, each by four times, then unit of energy will increase by sixteen times.

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