# CBSE Class XII Physics Viva Questions

CBSE Class XII Physics Viva Questions

1. Why the sonometer box contains holes?
2. What are the differences between free vibrations and forced
vibrations?
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 450?
12.Why the readings are taken by coinciding the cross wire with dark
fringes.
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 what
happens?
26.Instead of mercury source if we use sodium vapor lamp, what changes
we can observe?
27.What is meant by order of spectrum?
28.1 inch= _____ cm
29.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 compound
pendulum?
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 = ______________ eV
49.What is meant by Rigidity modulus?
50.Define moment of inertia.
51. 1 N/m2 = ________ dyne/cm2.
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 what
is it?
59.What is resonance?
60. Why horse shoe magnet is used in sonometer experiment?

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### Ask a Question:

• in class xii physics experiment(electromegnet) why does the sonometer box contains holes?

shubham goyal on 14 Jan 2011
• what is a tensor where is it used is it there for aieee

siddhartha on 28 Jan 2011
• uranium is radioactive because of high atomic no. ;which means it will disintegrate till it gets stabalised ;if stability is the sole motive then atoms with atomic nio. more than 80 should not exist at all.but it is not so why?

yunita on 01 Feb 2011
• what are the differences between free vibrations and forced vibrations?

Ashu on 02 Feb 2011
• What is the reason for anticlockwise circulation of drained water through a wash basin?

Satheesh on 03 Mar 2011
• explain about newtons ring experiment?with brief explanation and give me some viva question and answers abot that experiment?

swetha on 15 Apr 2011
• Define ‘dispersive power of a grating’ and explain about that experiment and send me some viva questions about that experiment?

swetha on 15 Apr 2011
• What is the use of galvanometer?how can i give answer to examiner? pls reply quickly

sai on 16 Apr 2011
• For a prism, assuming the angle as 60, draw i-d

curve and hence determine refractive index of the
prism.

MAHAMMAD on 19 Apr 2011
• One mole of an ideal gas expands at a constant temperature T of 310 K from an initial volume of 12 L to a final volume of19 L.How much work is done by the gas?

Raju on 26 Apr 2011
• 26.Instead of mercury source if we use sodium vapor lamp, what changes
we can observe?

chitti on 03 Aug 2011
• what is super position princple
tell me some vie-va questions and answers

chaitrapathi on 13 Oct 2011
• what happens to the deflection in the galvanometer when the voltage is increased?

divya on 29 Nov 2011
• diff b/w a primary and a secondary cell?
how does an led emit lighjt plz reply

nejmah on 03 Feb 2012
• What is the difference b/w refrective index or reflective index? please explain.

Prateek Joshi on 03 Feb 2012
• if we change the direction of torque in a galvanometer would there be any change in the deflection of galvanometer?

Namit Agrawal on 04 Feb 2013