phy 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?







State the Principle of a potentiometer. (The students say that potential drop is proportional to length but the constant quantities are not mentioned)
    How can we increase the sensitivity of a potentiometer?
    Define figure of merit of a galvanometer.
    Which has more resistance – a galvanometer or a milliammeter?
    How does an LED emit light?
    What is the difference between an ordinary diode and an LED?
    Define principal axis of a convex lens?
    What happens to the focal length of a concave mirror if it is immersed in water?
    What are the factors affecting the internal resistance of a cell?
    What are the difference between primary and secondary cell?
    Why can’t we use a dry cell for starting a car?
    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?







Why the sonometer box contains holes?2.What are the differences between free vibrations and forcedvibrations?3.What is the principle involved in wedge film?4.What is a wedge shaped film?5.What is superposition principle?6.Define interference.7.What are coherent sources?8.What is a mono chromatic source? Give example.9.What is meant by lease count?10.What is the lease count of traveling microscope?
11.
Why a glass plate is placed at an angle 45
0
?12.Why the readings are taken by coinciding the cross wire with darkfringes.13.What are the uses of wedge film experiment?14.What is meant by figure of merit of galvanometer?15.State Ohm’s law.
16.
What are Ohmic and non-Ohmic conductors? What is the shape of graph drawn between V and I in those cases?17.What happens if P and Q are interchanges?18.What is the use of Galvanometer?
19.
What is the use of Commutator?20.What is tangent law?21.What is meant by magnetic meridian?22.What is diffraction?23.define’ grating’24.Define ‘dispersive power of a grating’25.If the number of lines drawn on a grating are increased then whathappens?26.Instead of mercury source if we use sodium vapor lamp, what changeswe can observe?27.What is meant by order of spectrum?28.1 inch= _____ cm29.What are the main parts of a spectrometer? What are its uses?30.What is the lease count of a spectrometer?31.What is meant by compound pendulum?
32.
What is
L
in the formula for finding
g
value?33.Why L values are taken from graph?
34.
What is the value of
g
in SI units and in CGS units?35.Which method gives accurate value, simple pendulum or compoundpendulum?36.What is an inductor?37.What is a capacitor?

38.What is meant by resonance in LCR circuit?39.If the frequency increases, how the current in LCR circuit changes?40.What is a solar cell?41.How can you find the efficiency of a solar cell?
42.
Which type of materials are used in solar cells?43.What is Photo electric effect?44.What is Work function?45.Define Threshold frequency and Threshold wavelength.46.What is stopping potential?
47.
Can the work function depend on wavelength of the incident light.
48.
1 Joule = ______________ eV49.What is meant by Rigidity modulus?50.Define moment of inertia.
51.
1 N/m
2
= ________ dyne/cm
2
.
52.
1N = __________dyne.
53.
Which type of motion is exhibited by Torsional pendulum?54.What is the principle involved in Field along the axis of a coil?
55.
What is the principle involved in Sonometer experiment?
56.
Which type of waves are produced in Sonometer experiment?57.What are transverse waves?
58.
Which type of transformer is used in sonometer experiment and whatis it?59.What is resonance?
60.
Why horse shoe magnet is used in sonometer experiment?For more Question Papers of Physics
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