An Overview of Class 11 Physics Practical
FAQs on Class 11 Physics Practical
1. How are the marks for the CBSE Class 11 Physics practical exam typically distributed?
For the Class 11 Physics practical exam, the marks are generally divided across different sections to assess various skills. According to the 2025-26 syllabus, the typical distribution is:
- Two Experiments: One from each section, carrying a total of about 14-16 marks.
- Practical Record: Your lab manual and record of all experiments, which holds around 6-7 marks.
- One Activity: A short demonstration-based task, usually for 3 marks.
- Viva Voce: Oral questions based on your experiments and activities, which accounts for about 5-7 marks.
2. What are some of the most important experiments to prepare for the final practical exam?
While all experiments in the syllabus are important, some are frequently asked in exams due to the concepts they cover. For the 2025-26 session, you should focus on:
- Using Vernier Calipers and Screw Gauges for measuring dimensions.
- Determining the value of 'g' using a Simple Pendulum.
- Finding the force constant of a helical spring (Hooke's Law).
- Verifying the Parallelogram Law of Vectors.
- Determining the speed of sound using a Resonance Tube.
- Studying the relationship between temperature and pressure for a gas (Pressure Law).
3. What kind of questions are asked in the Class 11 Physics practical viva?
Viva questions are designed to test your real understanding of the experiment. The examiner will likely ask about:
- The principle or theory behind the experiment you performed.
- The formula used and the meaning of each term in it.
- Potential sources of error and how you can minimise them.
- The precautions you took while conducting the experiment.
- Definitions of key terms, such as 'least count', 'resonance', or 'elasticity'.
4. Why is it so important to mention the sources of error and precautions for each experiment?
Mentioning sources of error and precautions is crucial because it shows the examiner that you have a deep and practical understanding of the experiment, not just a theoretical one. It proves you are aware of the limitations of the apparatus and the procedure. This attention to detail is often what separates an average score from a top score in the practical exam evaluation.
5. What is the difference between an 'experiment' and an 'activity' in the Physics practical syllabus?
The main difference lies in their scope and the depth of evaluation. An experiment requires you to perform a detailed procedure, record multiple observations in a table, perform calculations, and arrive at a final result with units. An activity, on the other hand, is a shorter task meant to demonstrate a concept or principle, requiring only a brief observation and conclusion without extensive calculations.
6. How can I prepare for the viva session to ensure I can answer the questions confidently?
Effective viva preparation goes beyond just memorising definitions. You should focus on understanding the 'why' behind each step. Before the exam, try to explain the entire experiment (aim, apparatus, theory, procedure) to a friend or in front of a mirror. This will help you articulate the concepts clearly. Make sure you understand the function of each piece of apparatus and the reason for every precaution you list.
7. How does mastering skills from practicals, like using a Screw Gauge, help in the theory exam?
Practical skills directly support your theory preparation. For example, understanding how a Screw Gauge works gives you a strong grasp of concepts like least count, zero error, and significant figures. This practical knowledge makes it much easier to solve numerical problems related to measurement and errors in your theory paper, as you can visualise the process and potential pitfalls.
