Class 12 Physics Viva Questions 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
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.
