Class 12 Physics: Important Questions for Upcoming Exam
BoardsWallah Expert Team
Published 12 March 2026 · 8 min read
Class 12 Physics: Important Questions for Upcoming Exam
Hello, Class 12 students! With the board exams just three days away, it's crucial to focus on the most important questions that are likely to appear in the exam. Physics is a subject that demands both conceptual understanding and problem-solving skills. To help you prepare effectively, we have compiled a list of important questions covering key topics such as electromagnetism, thermodynamics, and modern physics. These questions are based on the latest CBSE syllabus and previous year question papers, ensuring that you are well-prepared for the exam.
According to the CBSE, the Class 12 Physics paper is structured into five sections: Section A (20 marks), Section B (20 marks), Section C (20 marks), Section D (20 marks), and Section E (20 marks). Each section has a different set of question types, ranging from very short answer questions (1 mark each) to long answer questions (5 marks each). CBSE also emphasizes the importance of practicing with previous year question papers to familiarize yourself with the exam pattern and question types.
Electromagnetism: Key Concepts and Questions
Electromagnetism is a fundamental topic in Class 12 Physics and carries a significant weightage of 18 marks. The chapter on electrostatics and current electricity is particularly important. Here are some crucial questions to practice:
- Derive the expression for the electric field due to a uniformly charged spherical shell at a point: (a) outside the shell (b) on the surface of the shell (c) inside the shell. NCERT Physics Textbook
- Explain the principle of a potentiometer and derive the formula for determining the emf of a cell using a potentiometer. NCERT Physics Textbook
- Derive the expression for the magnetic field due to a current-carrying solenoid. NCERT Physics Textbook
- State and explain Faraday's laws of electromagnetic induction. Derive the expression for the induced emf when a conducting rod moves in a uniform magnetic field. NCERT Physics Textbook
- Explain the construction and working of a transformer. Derive the expression for the voltage ratio in terms of the number of turns in the primary and secondary coils. NCERT Physics Textbook
Thermodynamics: Important Concepts and Questions
Thermodynamics is another critical topic, carrying 12 marks. It involves understanding the laws of thermodynamics and their applications. Here are some essential questions:
- State and explain the first law of thermodynamics. Derive the expression for the work done during the isothermal and adiabatic processes. NCERT Physics Textbook
- Define the second law of thermodynamics. Explain the Carnot cycle and derive the efficiency of a Carnot engine. NCERT Physics Textbook
- Explain the concept of entropy and its significance in thermodynamics. Derive the expression for the change in entropy in a reversible isothermal process. NCERT Physics Textbook
- Describe the working of a refrigerator and derive the expression for its coefficient of performance. NCERT Physics Textbook
- Explain the concept of thermal equilibrium and discuss the zeroth law of thermodynamics. NCERT Physics Textbook
Modern Physics: Essential Questions and Concepts
Modern physics, including topics like atomic structure and nuclear physics, carries 12 marks. These questions are often theoretical but require a strong conceptual foundation. Here are some important questions to focus on:
- Explain Bohr's model of the hydrogen atom and derive the expression for the radius of the nth orbit and the energy of the electron in the nth orbit. NCERT Physics Textbook
- State and explain the Heisenberg uncertainty principle. Discuss its significance in quantum mechanics. NCERT Physics Textbook
- Describe the working of a nuclear reactor. Discuss the role of control rods and coolants. NCERT Physics Textbook
- Explain the process of nuclear fusion and discuss its applications in the sun and stars. NCERT Physics Textbook
- Derive the expression for the de Broglie wavelength of a particle and discuss its significance in wave-particle duality. NCERT Physics Textbook
Tips for Effective Preparation
To ensure you perform well in the Physics exam, here are some tips to help you with your preparation:
- Understand the concepts: Physics is not just about memorizing formulas. Make sure you understand the underlying principles and concepts. This will help you apply the formulas correctly in different scenarios.
- Practice numerical problems: Numerical problems are a significant part of the Physics paper. Practice a variety of problems to build your problem-solving skills. Focus on the types of problems that have appeared in previous year question papers.
- Revise formulas: Create a list of all important formulas and revise them regularly. Knowing the formulas by heart will save you time during the exam.
- Write neatly and clearly: Presentation is key in the Physics exam. Write your answers neatly and clearly, and use diagrams wherever necessary to explain your concepts.
- Manage your time: Time management is crucial. Allocate time to each section based on the marks weightage. Start with the sections you are most confident about to build momentum.
- Practice full-length papers: Solving full-length previous year question papers under exam conditions will help you get a feel for the exam and improve your speed and accuracy.
- Stay calm and positive: Last-minute stress can affect your performance. Stay calm, take short breaks, and maintain a positive mindset. Trust in your preparation.
Practice with Previous Year Papers
Solving PYQs is the fastest way to prepare. Download free PDFs:
CBSE Class 12 Physics Previous Year Question Papers →CBSE Physics Exam Pattern and Marking Scheme
Understanding the exam pattern and marking scheme is essential for effective preparation. The CBSE Class 12 Physics paper is designed to test your knowledge and application skills. Here is a breakdown of the exam pattern:
| Section | Type of Questions | Marks |
|---|---|---|
| Section A | Very Short Answer Questions (1 mark each) | 20 |
| Section B | Short Answer Questions (2 marks each) | 20 |
| Section C | Short Answer Questions (3 marks each) | 20 |
| Section D | Long Answer Questions (5 marks each) | 20 |
| Section E | Value-Based Questions (5 marks each) | 20 |
The CBSE Physics paper is designed to test your understanding of concepts, your ability to apply them, and your problem-solving skills. Make sure to practice a variety of questions from each section to be well-prepared.
Common Mistakes to Avoid
Avoiding common mistakes can significantly improve your score. Here are some mistakes to watch out for:
- Not reading the questions carefully: Many students lose marks because they misread the questions. Take a few extra seconds to read each question thoroughly before starting to answer.
- Skipping steps in numerical problems: Show all the steps in your calculations. This helps in partial marking and ensures that you don't miss out on any marks.
- Not using proper units: Always use the correct units in your answers. Marks are often deducted for using incorrect or no units.
- Writing lengthy answers: Be concise and to the point. Long, rambling answers can confuse the examiner and lead to a loss of marks.
- Not revising your answers: Make sure to revise your answers if you have time. Check for any mistakes in calculations or logical errors.
Pass Percentage Trends
According to the CBSE official results, the pass percentage for Class 12 Physics has been on the rise over the past few years. Here’s a look at the trend:
📊 CBSE Physics — Pass % Trend
Source: CBSE Official Results
Frequently Asked Questions (FAQs)
How can I improve my marks in the Physics exam?
To improve your marks in the Physics exam, focus on understanding the concepts rather than just memorizing them. Practice a variety of numerical problems and previous year question papers. Write your answers neatly and clearly, and use diagrams to explain complex concepts. Lastly, manage your time effectively during the exam to ensure you attempt all questions.
What is the weightage of each chapter in the Physics exam?
The weightage of each chapter in the Physics exam is as follows:
| Chapter | Marks Weightage |
|---|---|
| Electrostatics | 8 |
| Current Electricity | 7 |
| Magnetic Effects of Current and Magnetism | 8 |
| Electromagnetic Induction and Alternating Currents | 8 |
| Electromagnetic Waves | 3 |
| Optics | 14 |
| Dual Nature of Matter and Radiation | 4 |
| Atoms and Nuclei | 6 |
| Electronic Devices | 7 |
| Communication Systems | 5 |
Are there any value-based questions in the Physics exam?
Yes, the Physics exam includes value-based questions. These questions are designed to test your understanding of the ethical and practical implications of the concepts you have learned. They usually carry 5 marks and are included in Section E. Make sure to practice these types of questions to be well-prepared.
What is the best way to manage time during the Physics exam?
The best way to manage time during the Physics exam is to allocate time to each section based on the marks weightage. Start with the sections you are most confident about to build momentum. For example, if you are strong in electromagnetism, begin with Section A or B. Allocate about 20 minutes to Section A, 40 minutes to Section B, 40 minutes to Section C, and 60 minutes to Section D and E. Leave some time at the end for revision.
How important is it to practice with previous year question papers?
Practicing with previous year question papers is extremely important. It helps you get familiar with the exam pattern, the types of questions asked, and the marking scheme. Solving PYQs under exam conditions can also boost your confidence and improve your speed and accuracy. CBSE recommends practicing with at least 5-7 previous year papers to be well-prepared.
What should I do if I get stuck on a question during the exam?
If you get stuck on a question during the exam, don’t panic. Take a deep breath and move on to the next question. Come back to the difficult question later if you have time. Sometimes, solving other questions can give you new insights or remind you of the approach you need. If you still can’t solve it, try to write down any relevant formulas or concepts that you know. This can help you earn partial marks.
Can I use a calculator in the Physics exam?
No, you are not allowed to use a calculator in the CBSE Class 12 Physics exam. However, you can use log tables if the question specifically allows it. Make sure to practice numerical problems without a calculator to improve your calculation skills. CBSE guidelines clearly state that calculators are not permitted in the exam.
What are the key topics to focus on for the Physics exam?
The key topics to focus on for the Physics exam are electromagnetism, thermodynamics, and modern physics. These topics carry a significant weightage of marks. Specifically, focus on chapters like electrostatics, current electricity, magnetic effects of current and magnetism, electromagnetic induction and alternating currents, optics, and atoms and nuclei. Practice the important questions and concepts from these chapters thoroughly.
Final Thoughts
The Class 12 Physics exam is a crucial part of your board exams. By focusing on the important questions, understanding the exam pattern, and practicing effectively, you can perform well and achieve the marks you desire. Remember to stay calm, manage your time wisely, and write your answers clearly and neatly. Good luck with your preparations, and we hope you ace your Physics exam!