Questions from Physics Viva
- What happens to the resistivity of a wire when it is doublefolded?
- How does the resistance of a wire depend on its dimensions?
- Why are the resistances used in a resistance box is like 1,2,2,5,10,20,20,50,100,200,
200,500,1000,2000,2000,5000 etc? - Why constantan or manganin wires are used for making the resistance coils in resistance box?
- What is a standard resistance?
- What are the characteristics of a standard resistance?
- What are the precautions to be observed while doing electricity experiments in general?
- What is a galvanometer?
- What is the resistance of an ideal ammeter?
- Why is ammeter always connected in series and voltmeter always connected in parallel?
- How can we convert a galvanometer into an ammeter or a voltmeter?
- What is shunt?
- What is AVO meter?
- What is the effect of temperature on the resistance of a conductor?
- Why does the resistance of a conductor increases with temperature, whereas that of a semiconductor decreases with temperature.
- What is conductance?
- What are non ohmic devices? give an example.
- What are superconductors?
- Define emf
- Why emf is said to be a misnomer?
- What happens if the battery used in the primary circuit of a potentiometer has less emf compared to the emf of the cell used in the secondary circuit?
- If you find that the galvanometer reading is shaky, what error can you expect?
- What do you mean by figure of merit of a galvanometer?
- Why a moving coil galvanometer is called so?
- What is the principle of a galvanometer?
- What is parallax? How is it removed?
- Define dispersion of light. Give its cause.
- Show dispersion of white light into seven colours.
- Define lateral displacements and give the factor on which it depends.
- Define critical angle and deduce the relation between refractive index and critical angle.
- Explain U-V graph in case of image formation in a convex lens.
- Distinguish between primary and secondary cell. (give two differences)
- How does rheostat act as a variable resistor, potential divider? (draw a diagram)
- What a non inductive coil? Give one special feature of non inductive coil?
- Draw neat and label diagram of leclanche cell.
- Write chemical equation in Daniel cell.
- Why is the emf of auxiliary battery greater than the emf to be measured?
- Why are standard resistances made up of constantan and Manganin?
- Define figure of merit and give it is S.I unit.
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Viva help for Optics Experiments
- Define refractive index.
- WHat is the least value of refractive index possible?
- What can you infer if someone says that he has a medium of refractive index less than one?
- Define focus.
- Define pole of a spherical mirror.
- Define optic centre.
- What is spherical abberration?
- WHat is chromatic abberration?
- What is the focal length of a plane mirror?
- How will you distinguish between a plane mirror, concave mirror and a convex mirror without feeling its surface with your hand?
- Under what conditions can a plane mirror for a real image?
- What are the differences between convex lens and concave lens?
- What is dispersion?
- Why a glass slab does not produce dispersion whereas a prism does?
- Define refractive angle of the prism.
- What is parallax?
- What is index correction?
- How is parallax removed?
- What are the practical uses of a concave mirror?
- Why a concave mirror is considered better as a makeup mirror?
- Why the reflectors used in search lights are paraboloidal and not concave?
- Distinguish real image and virtual image.
- Why mirrors are silvered on the back surface?
- Why a convesx mirror is preferred as the rear view mirror of vehicles?
- What is the principle on which the working of a simple microscope is based?
- Define power of a lens.
- Define angle of deviation
- What are the factors on which the lateral displacement produced by a glass slab depend?
- Define critical angle for a pair of media
- What is total internal reflection?
- What are the applications of total interna reflection?
- What is angle of minimum deviation?
- What are the factors on which the deviation produced by a prism depends
- What is the cause of dispersion?
- Why atravelling microscope is called so?
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Part -2 (Electricity Based Experiments :: Viva)
- What is Ac?
- WHat is DC?
- Distinguish unidirectional current and direct current.
- Define RMS value of AC.
- What do you mean by frequency of AC?
- Why the power supply to our houses are AC and not DC?
- What are the advantages of AC over DC?
- What is a choke coil?
- WHy a choke coil is considered better than a resistor to regulate AC?
- What is an electromagnet?
- What is resonance?
- What is the use of sound box in a sonometer?
- Why can’t we use a transformer in dc circuits?
- WHy ac transmitted to long distance are at very high voltages?
- What is electromagnetic induction?
- State Faraday’s laws of electromagnetic induction.
- Why Michael Faraday is called the father of electricity though he was not the one who discovered electricity?
- What is damping?
- What are eddy currents?
- State Lenz law.
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Viva Voce Questions from OHM’S LAW, METRE BRIDGE, POTENTIOMETER, GALVANOMETER AND OTHER EXPERIMENTS FROM ELECTRICITY AND MAGNETISM
- What happens to the resistivity of a wire when it is doublefolded?
- How does the resistance of a wire depend on its dimensions?
- Why are the resistances used in a resistance box is like 1,2,2,5,10,20,20,50,100,200,200,500,1000,2000,2000,5000 etc?
- Why constantan or manganin wires are used for making the resistance coils in resistance box?
- What is a standard resistance?
- What are the characteristics of a standard resistance?
- What are the precautions to be observed while doing electricity experiments in general?
- What is a galvanometer?
- What is the resistance of an ideal ammeter?
- Why is ammeter always connected in series and voltmeter always connected in parallel?
- How can we convert a galvanometer into an ammeter or a voltmeter?
- What is shunt?
- What is AVO meter?
- What is the effect of temperature on the resistance of a conductor?
- Why does the resistance of a conductor increases with temperature, whereas that of a semiconductor decreases with temperature.
- What is conductance?
- What are non ohmic devices? give an example.
- What are superconductors?
- Define emf
- Why emf is said to be a misnomer?
- What happens if the battery used in the primary circuit of a potentiometer has less emf compared to the emf of the cell used in the secondary circuit?
- If you find that the galvanometer reading is shaky, what error can you expect?
- What do you mean by figure of merit of a galvanometer?
- Why a moving coil galvanometer is called so?
- What is the principle of a galvanometer?
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