How to get 30 Marks in Physics Practical ? || Physics Viva important Questions || cbse 2020

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MOST IMPORTANT PHYSICS VIVA QUESTIONS !

most general questions usually asked during the viva of physics class 12th final practical ?

1) Why are the resistance used in a resistance box is like 1,2,2,5,10,20,20,50,100,200,200,500,1000,2000,5000 etc?

2) Why wire is double folded in resistance box?

3) Name the physical quantities to be kept constant for Ohm's law to be true?

4) State the principle of a potentiometer?

5) How can we increase the sensitivity of a potentiometer?

6) Define figure of merit of a galvanometer? Which has more resistance, a galvanometer or a millimeter?

7) How does an LED emit light?

8) What is the difference between an ordinary diode and an LED?

9) Define principle axis of a convex lens?

10) What happens to the focal length of a concave mirror if it is immersed in water?

11) What are the factors affecting the internal resistance of a cell?

12) What are the differences between primary and secondary cell?

13) Why can't we use a dry cell for starting a car?

14) Define spherical aberration and draw diagram to show it in case of a concave mirror?

15) What is parallax? How is it removed?

16) Define dispersion of light, give its cause?

17) Show dispersion of white light into seven colors?

18) Define lateral displacements and give the factor on which it depends?

19) Define critical angle and deduce the relstion between refractive index and critical angle?

20) Explain U-V graph in case of image formation in a convex lens?

21) Distinguish between primary and secondary cell, give two differences?

22) How does rheostat act as a variable resistor, potential divider? Illustrate with a diagram?

23) What is a non inductive coil? Give one special feature of non inductive cool?

24) Draw a neat and label diagram of Leclanche cell?

25) Write chemical equation in Daniel cell?

26) Why is the emf of auxiliary battery greater than the emf to be measured?

27) Why are standard resistances made up of constantan and Manganin?

28) Define figure of merit and give its SI unit?

In similar pattern you can have an idea about the rest of Physics chapters. The key to your better performance is a fair understanding of the subject. Please prepare yourself in view of the following guidelines:
MUST WATCH VIDEOS ABOUT PHYSICS PRACTICALS LIVE FROM SCHOOL PHYSICS LAB :
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11Class में ऐसे होता है Physics Practical | File checking | Allotment of Practical | Physics Viva

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How to get 30 Marks in Physics Practical ? || Physics Viva important Questions || cbse 2020-2021
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DOWNLOAD CBSE SYLLABUS FOR CLASSES 9 , CLASS 10. CLASS 11 , CLASS 12

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The frequently asked questions during viva are mostly related to methodology and principle.
Read thoroughly the complete theory behind the experiment.
Revise your practical notes.
Graphs are important part of Physics practical exams, try to a have there fair understanding.
Experiments have been developed to prove the principles, so remember the main principle behind performing any particular experiment.
Visualize the diagram of the experiment and draw it roughly.
In case of any doubt, consult with the teacher or lab attendant.
Don't be nervous at the time of experiment and write the important steps before starting the practical. Above all, it is your self belief that plays an important role. Develop "yes I can do it" attitude. All the best. May God help you.

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