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Physics Practical Class 12 Viva Questions

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[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.

• 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:

• 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.
• Application of Knowledge: They evaluate your ability to apply theoretical knowledge to real-world scenarios. This practical approach is a fundamental aspect of physics.
• 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?
• 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:

• Comprehensive Revision: Start by revising the theoretical concepts related to the experiments thoroughly. Ensure you can explain these concepts in simple terms.
• 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.
• 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.
• 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.
• 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.
• 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

• A linear graph represents a direct proportionality between two variables. Linearity can be identified by a straight-line relationship between the variables.
• The slope of a distance-time graph represents the speed or velocity of an object. A steeper slope indicates a higher speed.
• 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

• This observation could be due to factors like the discharge of a capacitor or the change in temperature, affecting the resistance of the circuit.
• 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.
• 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

• Confidence Is Key: Approach the viva section with confidence. Confidence in your knowledge and preparation can go a long way in demonstrating your competence.
• 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.
• 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.
• 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.
• 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.
• Be Attentive: Listen carefully to the examiner’s questions. Sometimes, they may provide hints or ask follow-up questions based on your initial response.
• 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.
• Use Proper Terminology: Employ appropriate scientific terminology and units when responding to viva questions. Precision in language can showcase your understanding.
• 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.
• 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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CBSE Practical Exams Preparation 2023: Check Physics Class 12th Viva Questions

The cbse practical exams preparation 2023 is underway, with the practical exam beginning on jan 1, 2023..

Updated on - Dec 29, 2022 | 07:04 PM IST Career Guide, Full Form -->

CBSE Practical Exams Preparation 2023 : The Class 12 CBSE Viva test is vital to score high marks in the CBSE Board exam 2023. Keeping in mind the numerous exams/test Class 12 students have to prepare for, we have accumulated a few CBSE Practical Exams Preparation 2023 tips to help students to sail smoothly during the CBSE Practical Exam 2023.

The Practical exams will commence on Jan 1, 2023. However, authorities are yet to release the CBSE 10th 12th date sheet 2023.

Also Read : CBSE Practical Exams Preparation 2023 - Check Business Studies Class 12th Viva Questions

CBSE Practical Exams Preparation 2023 - Class 12 Physics Viva Exam Sample Question and Answers

Therefore, below are few probable questions and answers candidates must be prepared for in their Physics Viva CBSE Practical Exams Preparation 2023.

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.

Hence, the above-mentioned questions and answers will guide students to be better equipped for their CBSE Practical Exams Preparation 2023.

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Setup of Compound Microscope – Viva Voice Questions | Physics Class 11

Viva voice questions.

• Setup of Compound Microscope – Viva Voice Questions

Viva Voice Questions Unit: Viva Voice Questions Subject: Physics Grade XI

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• Physics Grade XI

Viva Voice Questions With Answer Setup of Compound Microscope For: Science Class 11 | Physics

Q.1: What is the difference in the construction of a telescope and microscope? Ans. In the telescope the objective of larger focal length is used whereas in microscope image of very small objects.

Q.2: What is meant by magnifying glass? Ans. A simple microscope is also called a magnifying glass because it produces magnified image of very small objects.

Q.3: Where the image is formed in compound microscope? Ans. The image is compound microscope is formed at the least distance of distinct vision, which is 25 cm for a healthy eye.

Q.4: What is the formula to calculate the magnifying power of compound microscope? Ans. The magnifying power of a compound microscope is given by: M = L/fo ( 1 + d )/fo

Where, fo = focal length of objective fo = focal length of eye-piece L = Length of microscope

Q.5: What is magnifying power? Ans. Magnifying power as simply magnification produced by any lens is the ratio of distance of image to distance of object from the lens.

i.e. Magnification = distance of image from the lens / distance of object from the lens

Q.6: What is an objective and an eye-piece? Ans. An objective is a lens which is placed near the object, and eye-piece is a lens which is close to the eye.

Q.7: What is a compound microscope and what are it uses? Ans. It is an optical instrument consists of two convex lenses. It is used for viewing magnified image of very small objects.

Q.8: What are the condition of large magnification in a compound microscope? Ans. Following are the conditions of large magnification in a compound microscope:

(a) Focal length of objective and that of eye-piece should be small. (b) Length of microscope should be large.

Q.9: What is a simple microscope? Ans. It consists of a convex lens and when an object is placed with in its focal length, a virtual and magnified image is formed.

Q.10: What is the difference in using of a telescope and a microscope? Ans. Telescope is used to see distant object clearly whereas the microscope is used to see small objects in magnified form.

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MECHTECH GURU

SPECTROMETER VIVA QUESTIONS AND ANSWERS

Q: What is a spectrometer?

A: A spectrometer is a scientific instrument used to measure the intensity of light or other electromagnetic radiation at different wavelengths.

Q: What are the main components of a spectrometer?

A: The main components of a spectrometer are a light source, a collimating lens or mirror, a diffraction grating or prism, a focusing lens or mirror, and a detector.

Q: How does a spectrometer work?

A: A spectrometer works by directing light through a sample and separating the different wavelengths of light using a diffraction grating or prism. The separated wavelengths are then focused onto a detector which measures the intensity of each wavelength.

Q: What is the difference between a spectrometer and a spectrophotometer?

A: A spectrometer measures the intensity of light at different wavelengths, while a spectrophotometer measures the absorbance or transmittance of a sample at different wavelengths.

Q: What are some common applications of spectrometers?

A: Spectrometers are commonly used in analytical chemistry, physics, astronomy, and materials science for various applications such as chemical analysis, measuring the composition of materials, identifying substances, and studying the properties of light.

Q: What is a UV-Vis spectrometer?

A: A UV-Vis spectrometer is a type of spectrometer that measures the absorption or transmission of light in the ultraviolet (UV) and visible (Vis) regions of the electromagnetic spectrum.

Q: What is an infrared spectrometer?

A: An infrared spectrometer is a type of spectrometer that measures the absorption or transmission of light in the infrared region of the electromagnetic spectrum.

Q: What is a mass spectrometer?

A: A mass spectrometer is a type of spectrometer that measures the mass-to-charge ratio of ions in a sample.

Q: What is a Raman spectrometer?

A: A Raman spectrometer is a type of spectrometer that measures the Raman scattering of light by molecules in a sample to provide information about the vibrational modes of the molecules.

Q: What is a Fourier transform spectrometer?

A: A Fourier transform spectrometer is a type of spectrometer that uses an interferometer to measure the intensity of light at different wavelengths, and then applies a mathematical technique called Fourier transform to convert the data into a spectrum.

Q: What is a fluorescence spectrometer?

A: A fluorescence spectrometer is a type of spectrometer that measures the fluorescence emission of a sample after it has been excited by a light source.

Q: What is a circular dichroism spectrometer?

A: A circular dichroism (CD) spectrometer is a type of spectrometer that measures the differential absorption of left- and right-circularly polarized light by chiral molecules in a sample.

Q: What is a photoelectron spectrometer?

A: A photoelectron spectrometer is a type of spectrometer that measures the kinetic energy and number of electrons emitted from a sample when it is exposed to high-energy photons.

Q: What is a scanning electron microscope with energy dispersive X-ray spectroscopy (SEM-EDS)?

A: A SEM-EDS is an imaging instrument that combines a scanning electron microscope (SEM) with an energy dispersive X-ray spectrometer (EDS) to analyze the chemical composition of materials by measuring the X-rays emitted when a sample is bombarded with an electron beam.

Q: What is a time-of-flight mass spectrometer?

A: A time-of-flight mass spectrometer is a type of mass spectrometer that measures the mass-to-charge ratio of ions by measuring the time it takes for ions to travel a fixed distance in an electric field.

Q: What is a laser-induced breakdown spectrometer (LIBS)?

A: A laser-induced breakdown spectrometer (LIBS) is a type of spectrometer that uses a laser to vaporize and excite a sample, creating a plasma that emits light at different wavelengths that can be analyzed to determine the elemental composition of the sample.

Q: What is a tandem mass spectrometer?

A: A tandem mass spectrometer is a type of mass spectrometer that uses two or more stages of mass analysis to provide more detailed information about the structure and composition of molecules in a sample.

Q: What is a surface plasmon resonance spectrometer?

A: A surface plasmon resonance (SPR) spectrometer is a type of spectrometer that measures the binding of molecules to a surface by detecting changes in the refractive index of the surrounding medium due to the binding events.

Q: What is an X-ray fluorescence spectrometer?

A: An X-ray fluorescence (XRF) spectrometer is a type of spectrometer that measures the fluorescent X-rays emitted from a sample when it is exposed to high-energy X-rays.

Q: What is a Fourier-transform infrared spectrometer (FTIR)?

A: A Fourier-transform infrared (FTIR) spectrometer is a type of spectrometer that measures the absorption or transmission of infrared radiation by a sample and uses Fourier transform to convert the data into a spectrum.

Q: What is a near-infrared spectrometer?

A: A near-infrared (NIR) spectrometer is a type of spectrometer that measures the absorption or reflection of near-infrared radiation by a sample to provide information about the chemical composition of the sample.

Q: What is a gas chromatography-mass spectrometer (GC-MS)?

A: A gas chromatography-mass spectrometer (GC-MS) is an analytical instrument that combines gas chromatography (GC) with mass spectrometry (MS) to separate and analyze the components of a complex mixture.

Q: What is a liquid chromatography-mass spectrometer (LC-MS)?

A: A liquid chromatography-mass spectrometer (LC-MS) is an analytical instrument that combines liquid chromatography (LC) with mass spectrometry (MS) to separate and analyze the components of a complex mixture.

Q: What is an atomic absorption spectrometer (AAS)?

A: An atomic absorption spectrometer (AAS) is a type of spectrometer that measures the absorption of light by free atoms in a sample to determine the concentration of an element in the sample.

Q: What is a flame emission spectrometer?

A: A flame emission spectrometer is a type of spectrometer that measures the emission of light by free atoms in a flame to determine the concentration of an element in the sample.

A: A UV-Vis spectrometer is a type of spectrometer that measures the absorption or transmission of ultraviolet-visible radiation by a sample to provide information about the electronic transitions of molecules in the sample.

Q: What is a nuclear magnetic resonance spectrometer (NMR)?

A: A nuclear magnetic resonance (NMR) spectrometer is a type of spectrometer that measures the magnetic properties of atomic nuclei in a sample to provide information about the molecular structure and dynamics of the sample.

Q: What is a scanning tunneling microscope (STM)?

A: A scanning tunneling microscope (STM) is an imaging instrument that uses a sharp tip to scan the surface of a sample and measures the flow of electrons between the tip and the sample to create an image of the surface.

Q: What is a confocal microscope?

A: A confocal microscope is an imaging instrument that uses a pinhole to eliminate out-of-focus light and provide optical sectioning of a sample, which allows for 3D imaging of the sample.

Q: What is an electron paramagnetic resonance spectrometer (EPR)?

A: An electron paramagnetic resonance (EPR) spectrometer is a type of spectrometer that measures the magnetic properties of unpaired electrons in a sample to provide information about the electronic structure and dynamics of the sample.

Q: What is a cryogenic electron microscopy (cryo-EM)?

A: A cryogenic electron microscopy (cryo-EM) is an imaging technique that uses a beam of electrons to image frozen biological samples at cryogenic temperatures, which provides high-resolution 3D images of the samples.

Q: What is a circular dichroism spectrometer (CD)?

A: A circular dichroism (CD) spectrometer is a type of spectrometer that measures the differential absorption of left- and right-handed circularly polarized light by a sample, which provides information about the secondary structure and conformational changes of biomolecules.

Q: What is a time-resolved fluorescence spectrometer?

A: A time-resolved fluorescence (TRF) spectrometer is a type of spectrometer that measures the fluorescence decay of a sample over time, which provides information about the fluorescence lifetime and molecular dynamics of the sample.

Q: What is a dual polarisation interferometer (DPI)?

A: A dual polarisation interferometer (DPI) is a type of spectrometer that measures the refractive index of a sample using interferometry, which provides information about the thickness, density, and other properties of the sample.

Q: What is a laser-induced breakdown spectroscopy (LIBS) spectrometer?

A: A laser-induced breakdown spectroscopy (LIBS) spectrometer is a type of spectrometer that uses a laser to generate a plasma from a sample, which emits light that is analyzed to determine the elemental composition of the sample.

Q: What is a total internal reflection fluorescence microscope (TIRFM)?

A: A total internal reflection fluorescence microscope (TIRFM) is an imaging instrument that uses total internal reflection of light to selectively illuminate the surface of a sample and provide high-resolution fluorescence imaging of molecules near the surface.

Q: What is an inductively coupled plasma mass spectrometer (ICP-MS)?

A: An inductively coupled plasma mass spectrometer (ICP-MS) is an analytical instrument that uses plasma to ionize a sample and then measures the mass-to-charge ratio of the ions to identify and quantify the chemical components of the sample.

Q: What is a matrix-assisted laser desorption/ionization time-of-flight mass spectrometer (MALDI-TOF MS)?

A: A matrix-assisted laser desorption/ionization time-of-flight mass spectrometer (MALDI-TOF MS) is an analytical instrument that uses a laser to ionize a sample and then measures the time-of-flight of the ions to identify and quantify the chemical components of the sample.

Q: What is an electrochemical impedance spectrometer (EIS)?

A: An electrochemical impedance spectrometer (EIS) is a type of spectrometer that measures the impedance of an electrochemical system as a function of frequency, which provides information about the electron transfer processes and other electrochemical properties of the system.

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• Physics Practicals
• Physics Viva Questions With Answers

Physics Viva Questions with Answers

Physics relies on scientific knowledge to make predictions. Physics is one of the most fundamental and important subjects in the world. It impacts our lives significantly, from understanding how to build bridges to designing a new type of engine.

Understanding and learning the concepts gives scope to greater visualisation. When theoretical concepts and practical knowledge are obtained together, learning becomes easy. The viva questions in Physics can be a daunting task for students. The viva questions in Physics are designed to test the knowledge, understanding and skills acquired by students during their course. They also allow the examiner to identify any gaps in knowledge that may exist. Learning the viva questions also helps students to face competitive as well as board exams with confidence. The viva exam helps to fetch good scores since students will be allotted marks depending on their performance. Learn the concepts along with their applications as a part of efficient preparation.

Students can access the Physics chapter-wise viva questions on this page from the links provided below.

Class 12 Physics Viva Questions with Answers

Class 11 physics viva questions with answers, class 10 physics viva questions with answers.

Physics is a subject that requires a lot of understanding and practice. But it can also be fun if you have the right attitude. To make learning Physics easier, it is best to start with building a strong foundation. This can be done by strengthening the concepts with the help of viva voice questions and answers.

Important Questions for Class 12 Physics

Important Questions for Class 11 Physics

Class 12 Physics MCQs

Class 11 Physics MCQs

Class 10 Physics MCQs

Class 9 Physics MCQs

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