Possible
Three mark Questions
1. In
which fields the property of attraction and repulsion between charged bodies is
used ?
2. Distinguish
between conductors and insulators.
3. What
is an electric dipole ? Give the unit of the dipole moment.
4. What
is an electric line of force ?
5. State
Gauss’s law.
6. What
is an equipotential surface ?
7. Define
the electric flux. Give its unit.
8. Why
it is safer to be inside a car than standing under a tree during a lightning ?
9. Give
the uses of the capacitors.
10. What
is a polar molecule ? Give two examples.
11. Two
charges 10 X 10 -9 μC and 20 X 10 -9 μC are at a distance 0.03 m. Calculate the electric
potential energy.
12. What
is action of points ?
13. In
the given diagram, calculate the effective capacitance between A and B.
14. State
Ohm’s law.
15. Define
resistivity of a material.
16. Give
the applications of the secondary cells.
17. What
is the value of the red, red, red coloured carbon
resistor with no ring on the other side of the resistor ?
18. Give
any three uses of super conductors.
19. Distinguish
between electric power and electric energy.
20. What
is a wattmeter ?
21. Define:
Peltier coefficient and give its unit.
22. Define:
Maxwell’s right hand cork screw rule.
23. Define:
ampere.
24. Write
a short notes on current sensitivity of a galvanometer.
25. How
will you convert a galvanometer into an ammeter ?
26. What
is Lorentz force? Give any two properties.
27. In a
TG the deflection is 30o for a current of 1A. Calculate the current that
produces a deflection of 60o.
28. State
Biot-Savart law.
29. Define:
Thomson effect.
30. Calculate
the resistance of the tungsten wire of a 100W, 220V bulb.
31. The
magnetic induction at a point 10 cm from a long straight current carrying
conductor is 4 X 10 -6 tesla.
32. Calculate
the current in the conductor.
33. What
are the limitations of a cyclotron?
34. State
Lenz’s law.
35. State
Flemings right hand rule.
36. What
is self induction ?
37. Define
: the unit of coefficient of mutual inductance.
38. Define
: the efficiency of a transformer.
39. Define
: the rms value of an AC.
40. Define
: Q factor. 8. Calculate the mutual inductance between two coils when a current
of 3A changing to 8A in 0.5s in one coil, induces an emf
of 50V in the other coil.
41. What
are Fraunhofer lines ?
42. What
is Tyndal effect ?
43. Define:
wavefront.
44. State
Huygen’s principle.
45. Give
the differences between uniaxial and biaxial
crystals.
46. What
is polarization ?
47. What
are the uses of IR rays ?
48. State
Brewster’s law.
49. State
any five properties of canal rays .
50. State
the drawbacks of Rutherford’ s atom model.
51. Define
excitation potential energy.
52. What
are hard X-rays and soft X-rays ?
53. State
the conditions to achieve laser action ?
54. State
Moseley’s law.
55. What
is normal population ?
56. Give
the uses of laser in medicine.
57. Calculate
the minimum wavelength of X-rays produced by an X ray tube at 1000 kV.
58. The Rydberg constant for hydrogen is1.097X10 7m -1.Calculate
the shortest wavelength of Lyman series.
59. Calculate
the energy of the electron in the second orbit in the hydrogen atom.
60. State
the postulates of Bohr’s atom model.
61. What
is photo electric effect ?
62. Define
threshold frequency.
63. Define
work function of a material.
64. What
are photo electric cells ?
65. What
are de Broglie waves ?
66. Give
the uses of the electron microscope.
67. Define
a frame of reference.
68. State
the postulates of the special theory of relativity.
69. The
rest mass of an electron is 9.1X10 -31 kg.What will
be its mass if it moves with (4/5) th of the velocity
of light.
70. The
work function of iron is 4.7 eV. Calculate the threshold
frequency.
71. Calculate
the rest energy of an electron in MeV.
72. State
the limitations of using an electron microscope.
73. Define
radioactivity.
74. Define
one curie.
75. What
is artificial radioactivity ?
76. Explain
the types of neutrons.
77. What
is a breeder reactor ?
78. What
is artificial transmutation of elements ?
79. What
are cosmic rays ?
80. Name
the types of quarks. How a proton can be represented by quarks ?
81. Calculate
the nuclear radius of 13 Al 27 .
82. Tritium
has a half life period of 12.5 years. What fraction of the sample will be left
over after 25 years ?
83. The
decay constant of a radioactive sample is 0.00231 / day. Calculate the half
life and mean life periods.
84. The
isotope of 92 U 238 successively undergoes three α - decays and two β
-decays. What is the resulting isotope ?
85. What
is meant by depletion region of PN junction diode ?
86. What
are the biasing conditions to be followed in normal operation of a transistor ?
87. What
is an amplifier ? Mention its properties.
88. In a
common base transistor circuit I C = 0.97 mA and I B
= 30 μA. Calculate the value of α .
89. What
are sinusoidal and non-sinusoidal oscillators ?
90. State
Barkhausen conditions for oscillators.
91. Determine
the frequency of oscillations in a Colpitt’s
oscillator, if C1 = 0.01 μ F, C2 = 0.03 μ F and L = 100 mH.
92. What
is an integrated circuit ?
93. Distinguish
between analog and digital signals.
94. Draw
a circuit of OR gate using diodes.
95. What
are universal gates ? Why they are called so ?
96. Prove
the Boolean equation ( A + B ) ( A + C ) = A + BC .
97. What
is called skip zone ?
98. Define
modulation factor.
99. What
is an antenna ?
100. Define:
phase modulation.
101. Define:
bandwidth.
102. What
is directivity of an antenna ?
103. What
is called Buffer ?
104. What
is meant by scanning ?
105. What
are the applications of radar?
106. What
is meant by MODEM ?
107. What
are the advantages of fiber optic communication system ?
108. What
are advantages of frequency modulation ?