PHYSICS LAB VIVA-QUESTIONS
PHYSICS LAB VIVA QUESTIONS FOR ANNA UNIVERSITY
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Sonometer:
01.
What is the principle involved in Sonometer
experiment?
Ans: Resonance
02.
Which type of waves are produced in Sonometer
experiment?
Ans: Stationary Transverse waves
03.
What are transverse waves?
Ans: If the vibrations of the particles are
perpendicular to the propagation of the wave, those waves are said to be
transverse waves.
04.
Which type of transformer is used in sonometer
experiment and what is it?
Ans: Step down transformer. It is
a device, which converts high voltage currents to low voltage currents.
05.
What is resonance?
Ans: If the applied frequency is equal to the natural frequency of a
vibrating body then the body vibrates with maximum amplitude.
06.
Why horseshoe magnet is used in sonometer experiment?
07.
Why the current in ammeter sets as 1amp?
Ans: If you keep more current heat is generated and if we keep less than
1amp the wire vibrates with less amplitude.
08.
What is the use of rheostat?
Ans: It is a variable resistance.
09.
What is the frequency of a.c mains in INDIA?
Ans: 50 Hz.
10.
What is the frequency of DC?
Ans: Zero
11.
Why the sonometer box contains holes?
12.
What are the
differences between free vibrations and forced vibrations?
13.
What is meant
by linear density?
14.
What is frequency?
Wedge
film:
15.
What is the principle involved in wedge film?
16.
What is a wedge shaped film?
17.
What is superposition principle?
18.
Define interference.
19.
What are coherent sources?
20.
What is a mono chromatic source? Give example.
21.
What is meant by least count?
22.
What is the least count of traveling microscope?
23.
Why a glass plate is placed at an angle 450?
24.
Instead of sodium vapor lamp if we use mercury source,
is there any change in fringe pattern.
25.
Why the readings are taken by coinciding the cross
wire with dark fringes?
26.
What are the uses of wedge film experiment?
27.
What are the different types of phenomenon exhibited
by light?
28.
Which phenomenon of light is considered in explaining
‘interference’?
Figure of merit of galvanometer:
29.
What is meant by figure of merit of galvanometer?
30.
State Ohm’s law.
31.
What are Ohmic and non-Ohmic conductors? What is the
shape of graph drawn between V and I in those cases?
32.
What happens if P and Q are interchanged?
33.
What is the use of Galvanometer?
34.
What is the use of Commutator?
35.
What is the difference between a galvanometer and an
ammeter?
36.
Why ammeter is always connected in series in a
circuit?
37.
What are units of e.m.f?
Photoelectric effect:
38.
What is Photoelectric effect?
39.
What is Work function?
40.
Define Threshold frequency and Threshold wavelength.
41.
What is stopping potential?
42.
Can the work function depend on wavelength of the
incident light?
43.
1 Joule = ______________ eV
44.
In explaining the photoelectric effect which nature of
light is considered. (particle or wave)
45.
Which type of materials are used in Photoelectric
effect? What are they?
46.
Why alkali metals are used in photoelectric effect?
PHYSICS LAB VIVA-QUESTIONS
01. What
is the principle involved in Sonometer experiment?
02. Which
type of waves are produced in Sonometer experiment?
03. What
are transverse waves?
04. Which
type of transformer is used in sonometer experiment and what is it?
05. What
is resonance?
06. Why
horse shoe magnet is used in sonometer experiment?
07. Why
the current in ammeter sets as 1amp?
08. What
is the use of rheostat?
09. What
is the frequency of a.c mains in INDIA
10. Why
the sonometer box contains holes?
11. What
are the differences between free vibrations and forced vibrations?
12. What
is the principle involved in wedge film?
13. What
is a wedge shaped film?
14. What
is superposition principle?
15. Define
interference.
16. What
are coherent sources?
17. What
is a mono chromatic source? Give example.
18. What
is meant by lease count?
19. What
is the lease count of traveling microscope?
20. Why
a glass plate is placed at an angle 450?
21. Instead
of sodium vapor lamp if we use mercury source, is there any change in fringe
pattern.
22. Why
the readings are taken by coinciding the cross wire with dark fringes.
23. What
are the uses of wedge film experiment?
24. What
is meant by figure of merit of galvanometer?
25. State
Ohm’s law.
26. What
are Ohmic and non-Ohmic conductors? What is the shape of graph drawn between V
and I in those cases?
27. What
happens if P and Q are interchanges?
28. What
is the use of Galvanometer?
29. What
is the use of Commutator?
30. What
is Photo electric effect?
31. What
is Work function?
32. Define
Threshold frequency and Threshold wavelength.
33. What
is stopping potential?
34. Can
the work function depend on wavelength of the incident light.
35. 1
Joule = ______________ eV
36. What
is meant by Rigidity modulus?
37. Define
moment of inertia.
38. 1
N/m2 = ________ dyne/cm2.
39. 1N
= __________dyne.
40. Which
type of motion is exhibited by Torsional pendulum?
41. What
is the principle involved in Field along the axis of a coil?
42. What
is tangent law?
43. What
is meant by magnetic meridian?
44. What
is diffraction?
45. define’
grating’
46. Define
‘dispersive power of a grating’
47. If
the number of lines drawn on a grating are increased then what happens?
48. Instead
of mercury source if we use sodium vapor lamp, what changes we can observe?
49. What
is meant by order of spectrum?
50. 1
inch= _____ cm
51. What
are the main parts of a spectrometer? What are its uses?
52. What
is the lease count of a spectrometer?
53. What
is meant by compound pendulum?
54. What
is L in the formula for finding g value?
55. Why
L values are taken from graph?
56. What
is the value of g in SI units and in
CGS units?
57. Which
method gives accurate value, simple pendulum or compound pendulum?
58. What
is an inductor?
59. What
is a capacitor?
60. What
is meant by resonance in LCR circuit?
61. If
the frequency increases, how the current in LCR circuit changes?
62. What
is a solar cell?
63. How
can you find the efficiency of a solar cell?
64. Which
type of materials are used in solar cells?
PHYSICS LAB VIVA-QUESTIONS
Part-2
Torsional Pendulum:
47.
What is meant by Rigidity modulus?
48.
Define moment of inertia.
49.
1 N/m2 = ________ dyne/cm2.
50.
1N =
__________dyne.
51.
Which type of motion is exhibited by Torsional
pendulum?
52.
Define the terms stress and strain.
53.
Which material is used in the manufacture of torsional
pendulum wire?
54.
If the radius of the wire is doubled, how the rigidity
modulus varies?
55.
If you do the experiment with copper wire of same
diameter as that of Brass wire, is there any change in rigidity modulus.
56.
Why the rigidity modulus does not change if we take a
wire of same material but having twice the diameter of the first one?
57.
What is the relation between linear velocity and
angular velocity?
58.
What are the units of angular acceleration?
59.
What is a rigid body?
Field along the axis of a coil:
60.
What is the principle involved in Field along the axis
of a coil?
61.
What is tangent law?
62.
What is meant by magnetic meridian?
63.
What is biot-Savart’s law?
64.
What is Ampere’s law?
65.
What is the unit of magnetic induction ‘B’?
Diffraction grating:
66.
What is diffraction?
67.
Define ‘grating’
68.
Define ‘dispersive power of a grating’
69.
If the number of lines drawn on a grating are
increased then what happens?
70.
Instead of mercury source if we use sodium vapor lamp,
what changes we can observe?
71.
What is meant by order of spectrum?
72.
1 inch= _____ cm
73.
What are the main parts of a spectrometer? What are
its uses?
74.
What is the lease count of a spectrometer?
75.
What is meant by spectrum?
76.
What is dispersion?
77.
Out of all the colours which colour deviates more.
78.
Out of all the colours which colour has least
wavelength and which colour has highest wavelength.
Compound Pendulum:
79.
What is meant by compound pendulum?
80.
What is L
in the formula for finding g value?
81.
Why L values are taken from graph?
82.
What is the value of g in SI units and in CGS units?
83.
Which method gives accurate value, simple pendulum or
compound pendulum?
84.
Where the g
value is maximum? (at poles or at equator)
85.
What is meant by time period?
86.
Define ‘one oscillation’.
LCR Circuit:
87.
What is an inductor?
88.
What is a capacitor?
89.
What is meant by resonance in LCR circuit?
90.
If the frequency increases, how the current in LCR
circuit changes?
91.
What is the use of resistance in LCR circuit?
92.
If the resistance increases in LCR circuit, how the
sharpness changes?
93.
What is meant by impedance in LCR circuit?
94.
What is Q-factor?
95.
What is meant by Impedance in LCR circuit?
Solar cell:
96.
What is a solar cell?
97.
How can you find the efficiency of a solar cell?
98.
Which type of materials are used in solar cells?
99.
Solar cell is which biased?
100. What is the
graph of solar cell gives?
101. What is
short circuit current?
102. What is
open circuit voltage?
103. Name a
device, which converts electrical energy to light energy.
Other General Questions:
104. What is the
abbreviation of LASER?
105. What are matter waves?
106. What are
superconductors?
107. What is
polarisation?
108. What are
the characteristics of laser?
109. Define
Numerical Aperture.
110.
What is the difference between Holography and Photography?
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