Examination 2018: Practicals Viva Voce (Physics ).


Examination 2018: The Countdown Begins……III

The Physics Practicals Viva Voce is a very important part of the examination. With the examination season having begun, a good performance in the practicals in general and VIVA-VOCE in particular will mark a great and confident beginning to the big days ahead. The first crucial stage of C.B.S.E examination is the practical examination which must be on now or round the corner and would probably be over by 15th February 2018. This period offers you with a golden opportunity to prepare a few topics for the theory examination as well. The practical syllabus has 3 parts–

1.      Electricity

2.      Ray Optics

3.      Semiconductors

So before you go in for your practical examination, prepare these topics well.

Viva-voce questions for the three parts are being posted for you.

My personal experience over various years has shown that a large no. of students fail to perform well in Viva-voce even if they know the answers because they can’t express themselves.

So I would advise you to make a group (of students) if you have not done so far. Plan preparation and discuss the questions with each other. This will give you much needed practice and confidence to express yourself when you actually go for the viva; an important part of the practical examination.

Here are the questions for you:

Viva-voce- Electricity

Important diagrams:

  • Meter bridge
  • Potentiometer circuits
  • Conversion of galvanometer to ammeter & voltmeter

Viva-voce- Ray Optics

Important diagrams for this sub-unit

  • Ray diagrams for image formation by concave/convex mirrors and lenses
  • Path of light ray through prism (Derive relevant relations and memorise them)

Viva-Voce – Semiconductors 

Important diagrams for this sub-unit

  • Symbols of different types of diodes : pn junction, zener diode,LED etc.
  • Forward & Reverse biasing
  • Circuit for study of forward  & reverse characteristics of pn junction
  • Circuit for study of reverse ch of zener diode
  • Symbols of pnp and npn transistor
  • Circuit for study of characteristic curves of transistor in common emitter mode

It is also advisable to practice diagrams for half wave & full wave rectifier. The theory should be carefully prepared if the project you selected is based on electronic devices.

Needless to say that the practice will help you in CBSE theory exams well.

Remain relaxed when you are called for viva. Most of the examiners are friendly and will try to get the best out of you.

So get started.


Physics Practicals Viva Voce


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