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CBSE Class 11 Important Questions Physics
By Swati Singh
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Updated on 11 Jul 2025, 15:13 IST
Infinity Learn gives students a set of important questions for CBSE Class 11 Physics based on the CBSE syllabus. These questions focus on the main topics from each chapter, helping students prepare better for their exams. By solving them, students can revise quickly, understand concepts better, and feel more confident.
Practising these questions helps students get an idea of the types of questions that may come in the exam. It also helps them feel more comfortable while answering. Overall, this is a helpful study tool that makes Physics preparation easier and more effective.
CBSE Class 11 Important Questions Physics - Chapter wise
| Unit No. | Chapter Name | Unit Title |
| 1 | Physical World | Physical World and Measurement |
| 2 | Units and Measurements | Physical World and Measurement |
| 3 | Motion in a Straight Line | Kinematics |
| 4 | Motion in a Plane | Kinematics |
| 5 | Laws of Motion | Laws of Motion |
| 6 | Work, Energy and Power | Work, Energy and Power |
| 7 | System of Particles and Rotational Motion | System of Particles and Rotational Motion |
| 8 | Gravitation | Gravitation |
| 9 | Mechanical Properties of Solids | Properties of Bulk Matter |
| 10 | Mechanical Properties of Fluids | Properties of Bulk Matter |
| 11 | Thermal Properties of Matter | Properties of Bulk Matter |
| 12 | Thermodynamics | Thermodynamics |
| 13 | Kinetic Theory | Behaviour of Perfect Gas and Kinetic Theory |
| 14 | Oscillations | Oscillations and Waves |
| 15 | Waves | Oscillations and Waves |
20 Most Important Questions from Class 11 Physics Chapters
Q1. Define a set. Give an example.
A: A set is a well-defined collection of distinct objects.
Example: The set of vowels in English alphabet = {a, e, i, o, u}
Q2. Write the set of natural numbers less than 7 using roster form.
A: {1, 2, 3, 4, 5, 6}
Q3. Express the set A = {x : x is a prime number less than 10} in roster form.
A: A = {2, 3, 5, 7}
Q4. Write the following in set-builder form: {2, 4, 6, 8, 10}
A: A = {x : x is an even natural number less than or equal to 10}
Q5. What is the cardinal number of the set A = {x : x is a letter in the word “CLASS”}?
A: Letters in “CLASS” = {C, L, A, S} ⇒ n(A) = 4
Q6. If A = {1, 2, 3} and B = {3, 4, 5}, find A ∪ B.
A: A ∪ B = {1, 2, 3, 4, 5}
Q7. If A = {1, 2, 3} and B = {3, 4, 5}, find A ∩ B.
A: A ∩ B = {3}
Q8. If A = {1, 2, 3} and B = {3, 4, 5}, find A – B.
A: A – B = {1, 2}
Q9. Define universal set with an example.
A: A universal set contains all elements under consideration.
Example: For natural numbers ≤ 10, U = {1, 2, 3, ..., 10}
Q10. What is the power set of A = {1, 2}?
A: P(A) = {∅, {1}, {2}, {1, 2}}
Q11. If U = {1, 2, 3, 4, 5} and A = {1, 3, 5}, find A′ (complement of A).
A: A′ = {2, 4}
Q12. State whether the following is a finite or infinite set: A = {x : x is a natural number}
A: Infinite set.
Q13. Are the sets A = {1, 2, 3} and B = {3, 1, 2} equal? Justify.
A: Yes. Both sets have the same elements. Sets are unordered.
Q14. Find the number of subsets of A = {a, b, c}.
A: Number of subsets = 2ⁿ = 2³ = 8
Q15. Let A = {1, 2, 3} and B = {3, 4, 5}. Find A ∩ (A ∪ B).
A: A ∪ B = {1, 2, 3, 4, 5}; A ∩ (A ∪ B) = {1, 2, 3}
Q16. If A = {1, 2}, B = {2, 3}, and C = {3, 4}, find (A ∪ B) ∩ C.
A: A ∪ B = {1, 2, 3}; (A ∪ B) ∩ C = {3}
Q17. Define disjoint sets with an example.
A: Two sets are disjoint if they have no common elements.
Example: A = {1, 2}, B = {3, 4}; A ∩ B = ∅
Q18. If A = {x: x is a vowel in “MATHEMATICS”}, write A.
A: A = {A, E, I} or {a, e, i} if in lowercase
Q19. Let A = {x: x ∈ N, x < 6}, B = {x: x ∈ N, x even, x ≤ 10}. Find A ∩ B.
A: A = {1, 2, 3, 4, 5}, B = {2, 4, 6, 8, 10}
⇒ A ∩ B = {2, 4}
Q20. Show that A – B ≠ B – A when A = {1, 2, 3}, B = {2, 3, 4}
A:
A – B = {1}
B – A = {4}
⇒ {1} ≠ {4}
CBSE Class 11 Maths Chapters 1 Sets - Summary
Chapter 1: Physical World
- What is Physics and how does it help in technology development?
- Explain the fundamental forces of nature.
- Distinguish between science, technology, and engineering.
- State the scope and excitement of Physics.
Chapter 2: Units and Measurements
- Define SI units. List base quantities with units.
- Explain the concept of significant figures with examples.
- Derive the formula for percentage error and combination of errors.
- Convert units from one system to another (e.g., CGS to SI).
Chapter 3: Motion in a Straight Line
- Derive equations of motion using calculus.
- Differentiate between average speed and instantaneous speed.
- Solve numerical problems on uniform acceleration.
- Interpret motion-time graphs.
Chapter 4: Motion in a Plane
- Define scalar and vector with examples.
- Derive the expression for projectile motion range and time of flight.
- Explain uniform circular motion.
- Add two vectors using the parallelogram law.
Chapter 5: Laws of Motion
- State and explain Newton’s three laws of motion with examples.
- Explain the concept of inertia and types.
- Derive an expression for motion on an inclined plane.
- What is the difference between static and kinetic friction?
Chapter 6: Work, Energy and Power
- Derive the work-energy theorem.
- Define kinetic and potential energy. Write their formulas.
- Define power and its units. What is commercial energy?
- Solve problems involving work done by variable forces.
Chapter 7: System of Particles and Rotational Motion
- Define center of mass and torque.
- State and derive the principle of conservation of angular momentum.
- Derive the relation between torque and angular acceleration.
- Solve problems based on moment of inertia.
Chapter 8: Gravitation
- State and derive Newton’s law of gravitation.
- Derive the expression for gravitational potential energy.
- Explain the variation of acceleration due to gravity with height and depth.
- What is geostationary satellite?
Chapter 9: Mechanical Properties of Solids
- Define stress, strain, and modulus of elasticity.
- Explain Hooke’s Law.
- Differentiate between elastic and plastic materials.
- Derive the formula for Young’s modulus.
Chapter 10: Mechanical Properties of Fluids
- Explain Pascal’s law with applications.
- Derive Bernoulli’s theorem.
- What is viscosity? State Stokes’ law.
- Solve numerical problems on surface tension and capillarity.
Chapter 11: Thermal Properties of Matter
- Explain modes of heat transfer.
- Define thermal expansion and specific heat.
- Describe Newton’s Law of Cooling.
- What is the principle of calorimetry?
Chapter 12: Thermodynamics
- State the first law of thermodynamics and its mathematical form.
- Explain isothermal and adiabatic processes.
- Define internal energy and enthalpy.
- Derive relation between Cp and Cv.
Chapter 13: Kinetic Theory of Gases
- State assumptions of kinetic theory of gases.
- Derive the expression for pressure exerted by an ideal gas.
- What is the relation between temperature and average kinetic energy?
- Define RMS velocity and calculate it.
Chapter 14: Oscillations
- Define SHM and write its differential equation.
- Derive the expression for the period of a simple pendulum.
- What are damped and forced oscillations?
- Solve numerical problems based on SHM.
Chapter 15: Waves
- Differentiate between transverse and longitudinal waves.
- Define wavelength, frequency, and wave velocity.
- Derive the expression for speed of sound in a gas.
- Explain the principle of superposition and beats.
Benefits of Solving CBSE Class 11 Important Questions Physics
1. Helps Focus on Exam-Relevant Topics: Important questions highlight concepts that appear frequently in exams. For example, Chapter 1 covers scope of physics, SI units, and types of forces, which are crucial for test success.
2. Saves Time During Revision: Instead of revisiting the whole textbook, students can review key questions for fast, efficient revision before tests or finals.
3. Boosts Conceptual Understanding: Solving targeted questions deepens understanding of how physics applies in daily life, science, and technology.
4. Strengthens Answer-Writing Skills: Students learn to frame precise and to-the-point answers, especially for theory-based questions that are common in CBSE papers.
5. Builds Confidence for Term-End Exams: Practicing familiar question types boosts exam confidence and reduces last-minute stress.
6. Good for Self-Evaluation: Students can use important questions to test themselves, find weak areas, and revise accordingly for improvement.
7. Improves Memory Retention: Repeatedly solving core questions from foundational chapters helps students retain key definitions and principles.
8. Foundation for Future Chapters: Chapter 1 sets the tone for deeper concepts in mechanics and thermodynamics. Mastering it through key questions builds strong basics.
FAQs on CBSE Class 11 Important Questions Physics
What are important questions in Class 11 Physics?
Important questions are selected problems from each chapter that focus on key concepts, formulas, and numericals. These questions are commonly asked in CBSE exams and help students revise the most scoring topics efficiently.
How can I find chapter-wise important questions for Class 11 Physics?
You can find chapter-wise important questions:
In NCERT Exemplar and sample papers
From school-assigned practice papers
- On trusted educational platforms like Infinity Learn, which provide downloadable PDFs and detailed solutions
Are NCERT questions enough for Class 11 Physics exam preparation?
NCERT is essential and forms the base for CBSE exams. But to score high, students should also solve important questions, numerical problems, HOTS (Higher Order Thinking Skills), and previous year papers for better exam readiness.
Why should I practice important questions before the exam?
Practicing important questions helps students to:
Understand key concepts clearly
Improve speed and accuracy
Get familiar with exam-type questions
- Boost confidence and reduce last-minute stress
Which chapters in Class 11 Physics are most important for exams?
Chapters like:
Laws of Motion
Work, Energy and Power
Gravitation
Thermodynamics
Oscillations
are considered high-weightage chapters. They often carry numericals and conceptual questions that appear frequently in CBSE papers.