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Physics Practical Class 12 Viva Questions

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Physics Practical Class 12 Viva Questions

[PDF] Physics Practical Class 12 Viva Questions

Here you will find viva questions for class 12 physics practicals. Experiment wise viva questions are provided with answers.

  1. Measurement of Resistance
  • To determine resistance per cm of a given wire by plotting a graph of potential difference versus current.
  • To find the resistance of a given wire using a metre bridge and hence determine the resistivity (specific resistance) of its material.
  • To verify the laws of combination (series) of resistances using a metre bridge.
  • To verify the laws of combination (parallel) of resistances using a metre bridge.

2. Measurement of Electromotive Force and Potential Difference

  • To compare the EMF of two given primary cells using a potentiometer.
  • To determine the internal resistance of a given primary cell using a potentiometer.

3. Galvanometer, Ammeter and Voltmeter

  • To determine the resistance of a galvanometer by half-deflection method and to find its figure of merit.
  • To convert the given galvanometer (of known resistance and figure of merit) into a voltmeter of desired range and to verify the same.
  • To convert the given galvanometer (of known resistance and figure of merit) into an ammeter of desired range and to verify the same.

4. Frequency of AC (Alternating Current) Mains

  • To find the frequency of the AC mains with a sonometer.

5. Focal Length of Spherical Mirrors

  • To find the value of v for different values of u in the case of a concave mirror and to find the focal length.
  • To find the focal length of a convex mirror, using a convex lens.

6. Focal Length of Spherical Lenses

  • To find the focal length of a convex lens by plotting graphs between u and v or between 1/u and 1/v.
  • To find the focal length of a concave lens using a convex lens.

7. Refractive Index of Prism Material, Glass Slab and Transparent Liquid

  • To determine the angle of minimum deviation for a given prism by plotting a graph between the angle of incidence and the angle of deviation.
  • To determine the refractive index of a glass slab using a travelling microscope.
  • To find the refractive index of a liquid by using a convex lens and plane mirror.

8. Semiconductor Diodes and Transistors

  • To draw the I-V characteristic curve of a p-n junction in forward bias and reverse bias.
  • To draw the characteristic curve of a Zener diode and to determine its reverse breakdown voltage.
  • To study the characteristics of a common emitter npn (or pnp) transistor and to find out the values of current and voltage gains.

In Class 12 physics practical examinations, viva questions plays an important role in evaluating a student’s understanding of the experiments they have performed. These viva questions are designed to assess not only your theoretical knowledge but also your ability to apply that knowledge in a practical setting. Understanding the significance of viva questions and being well-prepared for them can significantly impact your overall score in the practical exams.

Why Are Viva Questions Important in Class 12 Physics Practical?

Viva questions serve as a bridge between theory and practice. They require you to explain the principles behind the experiments you’ve conducted, describe the apparatus used, and elucidate your observations and conclusions. Here’s why viva questions are so crucial:

  1. In-Depth Understanding: Viva questions demand a deeper understanding of the subject matter. They assess whether you can grasp the concepts beyond just rote memorization.
  2. Application of Knowledge: They evaluate your ability to apply theoretical knowledge to real-world scenarios. This practical approach is a fundamental aspect of physics.
  3. Communication Skills: Viva questions assess your communication skills. Can you articulate your thoughts clearly and concisely? Can you explain complex concepts in a simple and coherent manner?
  4. Critical Thinking: You may encounter unexpected questions during viva sessions. These questions test your ability to think critically and solve problems on the spot.

How to Prepare for the Viva Section in Class 12 Physics Practical

Now that you understand the significance of viva questions, let’s explore how to prepare effectively:

  1. Comprehensive Revision: Start by revising the theoretical concepts related to the experiments thoroughly. Ensure you can explain these concepts in simple terms.
  2. Practice Answering: Practice answering viva questions regularly. You can find sample questions in textbooks or online resources. Practice with a partner or a teacher for a realistic simulation.
  3. Hands-On Experience: Revisit the experiments you’ve performed. Familiarize yourself with the equipment and apparatus used. Understanding the setup and procedure will boost your confidence during the viva.
  4. Logical Reasoning: Be prepared to provide logical explanations for your observations and results. Understanding the “why” behind the “what” is often a key focus of viva questions.
  5. Stay Calm and Confident: During the viva, remain calm and composed. If you don’t know the answer to a question, it’s okay to admit it. Confidence in your responses is essential.
  6. Be Attentive: Listen carefully to the examiner’s questions. Sometimes, they may provide hints or clues within the questions themselves.

viva questions in Class 12 physics practical exams are a means to assess your practical knowledge, problem-solving skills, and communication abilities. By preparing diligently and staying composed during the viva, you can excel in this important aspect of your physics practical examination.

Viva Questions on Graphs and Observations

In this section, we will explore viva questions that often focus on interpreting graphs and explaining observations made during experiments. These questions assess your analytical skills and your ability to draw meaningful conclusions from experimental data.

Interpreting Graphs: Viva Questions and Answers

  1. What Does a Linear Graph Represent, and How Can You Identify Linearity?
    • A linear graph represents a direct proportionality between two variables. Linearity can be identified by a straight-line relationship between the variables.
  2. Explain the Significance of the Slope of a Distance-Time Graph.
    • The slope of a distance-time graph represents the speed or velocity of an object. A steeper slope indicates a higher speed.
  3. In a Current-Voltage Graph, What Does the Slope Represent?
    • In a current-voltage graph for a resistor, the slope represents the resistance (R) of the resistor, according to Ohm’s Law (V = IR).

Addressing Observation-Based Viva Questions

  1. During an Experiment, You Observe That the Ammeter Shows a Decrease in Current Over Time. Explain This Phenomenon.
    • This observation could be due to factors like the discharge of a capacitor or the change in temperature, affecting the resistance of the circuit.
  2. In an Experiment Involving a Pendulum, You Notice That the Period (T) Increases as the Length (L) Increases. Why Does This Occur?
    • This phenomenon occurs because the period of a pendulum is directly proportional to the square root of its length (T ∝ √L), as explained by the pendulum formula.
  3. Explain the Effect of Increasing the Number of Turns in a Coil on the Strength of an Electromagnet.
    • Increasing the number of turns in a coil enhances the strength of an electromagnet. This is due to the greater magnetic field produced by the increased current flow through the coil.

These viva questions emphasize your ability to analyze data, draw conclusions, and link observations to underlying physics principles. During your practical exam, be prepared to explain the significance of graphs and provide well-reasoned answers based on your observations, measurements, and experimental outcomes.

Summing Up the Significance of Viva Questions

In your Class 12 physics practical examinations, viva questions serve as a comprehensive assessment tool that goes beyond mere experimentation. They evaluate your understanding of theoretical concepts, your ability to apply knowledge in a laboratory setting, and your communication skills.

Remember, viva questions aren’t designed to catch you off guard or intimidate you. Instead, they aim to gauge your readiness to apply physics principles in real-world scenarios, just as you would in your future scientific endeavors.

Final Tips for Acing Your Physics Practical Viva

  1. Confidence Is Key: Approach the viva section with confidence. Confidence in your knowledge and preparation can go a long way in demonstrating your competence.
  2. Thorough Revision: Before the exam, revisit the theoretical concepts related to the experiments you’ve performed. Ensure you can explain these concepts clearly and concisely.
  3. Practice Makes Perfect: Practice answering viva questions with a partner, teacher, or even in front of a mirror. Practicing helps you refine your answers and build confidence.
  4. Understand the ‘Why’: When responding to viva questions, don’t just focus on the “what.” Try to explain the “why” behind each step, observation, or result. Understanding the underlying principles is key.
  5. Stay Composed: If you encounter a challenging question or draw a blank, take a deep breath and remain composed. It’s okay to ask for clarification or admit if you don’t know the answer.
  6. Be Attentive: Listen carefully to the examiner’s questions. Sometimes, they may provide hints or ask follow-up questions based on your initial response.
  7. Time Management: Manage your time wisely during the viva. Don’t spend too much time on one question; aim for a balanced distribution of time across all questions.
  8. Use Proper Terminology: Employ appropriate scientific terminology and units when responding to viva questions. Precision in language can showcase your understanding.
  9. Stay Neat and Organized: If you need to draw diagrams or sketches, ensure they are neat and well-labeled. A well-organized presentation can make a positive impression.
  10. Review Your Practical Work: Familiarize yourself with the experiments you’ve conducted. Knowing the setup, apparatus, and procedures can help you answer questions confidently.

Hope this helps!


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