Possible
Five mark Questions
1. Derive
an expression for the capacitance of a parallel plate capacitor with a
dielectric between the plates.
2. State
and explain Coulomb’s Inverse square law in electrostatics.
3. Derive
an expression for the torque on an electric dipole in an electric field.
4. State
the properties of electric lines of forces.
5. +q
and -3q are separated by 1m. At which point between the charges on its axial
line the potential is zero? ( OR ) A parallel plate capacitor with air between
the plates has a capacitance of 8 pF. What will be
the capacitance, if the distance between the plates be reduced to half and the
space between the plates is filled with a substance of dielectric constant 6 ?
6. Derive
an expression for the electric potential at any point due to a point charge.
7. Derive
an expression for the energy stored in a capacitor.
8. Explain
the action of lightning conductor.
9. Explain
the action of Lead acid accumulator.
10. Explain
the principle of the potentiometer.
11. Derive
the relation between current and drift velocity.
12. The
effective resistances of two resistances are 10 Ω and 2.4 Ω when they
are connected in series and parallel. What are the individual resistors ?
13. The
resistance of a coil is 50 Ω at 200 C and 65 Ω at 700 C. Find the
temperature coefficient of resistance.
14. Explain
the working of Leclanche cell.
15. Explain
the method to find the resistance of a wire using the metre
bridge.
16. Explain
the method to compare the emf’s of the two cells
using the potentiometer. 15. State and explain Faraday’s laws of electrolysis.
17. Derive
condition for bridge balance of a Wheatstone’s
bridge.
18. Explain
the construction and working of Daniel cell.
19. Explain
Positive Thomson effect.
20. Explain
the conversion of galvanometer into voltmeter.
21. Derive
an expression for the force on a current carrying conductor in a magnetic
field.
22. Write
a short notes on voltage sensitivity of a galvanometer.
23. A
current of 4 A flows through 5 turns coil of a TG having a diameter of 30 cm.
If the horizontal component of the
24. Earth’s
magnetic induction is 4 X 10 -5 T, find the deflection produced in the coil.
25. A
galvanometer has a resistance of 100 ohm. A shunt resistance of 1 ohm is
connected across it. What part of the total current flows through the
galvanometer ?
26. Write
a short notes on Thermopile.
27. Explain
the method of inducing an emf by changing the area
enclosed by a coil.
28. Derive
an expression for the energy associated in an inductor.
29. Explain
the various forms of energy losses in a transformer.
30. Explain
the construction and working of a choke coil.
31. Explain
the formation of eddy currents.
32. Write
a short notes on transformers.
33. A
solenoid of length 1m and 0.05 m diameter has 500 turns. If a current of 2 A
passes through the coil, calculate the co-efficient of self induction of the
coil.
34. A
transformer has an efficiency of 80%. It is connected to a power input at 4kW
and 100 V. If the secondary voltage is 240 V, calculate the primary and the
secondary currents.
35. Explain
the construction and the working of Nicol prism.
36. Explain
Young’s double slit experiment.
37. Explain
the corpuscular theory of light.
38. Explain
Raman effect.
39. Using
Huygen’s principle, explain the method of obtaining
the position of a new wavefront.
40. In
Newton’s ring experiment the diameter of the 20th dark ring was found to be
5.82 mm and that of the 10th ring 3.36 mm. If the radius of the plano- convex lens is 1 m. Calculate the wavelength of the
light used.
41.
A parallel beam of monochromatic light
is allowed to incident normally on a plane transmission grating having 5000
lines per centimeter. A second order spectral line is found to be diffracted at
an angle 300. Find the wavelength of the light used.
42. State
and explain Bragg’s law.
43. Explain
the action of the Ruby laser.
44. Explain
the various types of the spectral series of the hydrogen atom.
45. Explain
the construction of the discharge tube.
46. Calculate
the closest approach of α - particle to the copper nucleus when α –
particle of 5 MeV is scattered back by a thin sheet
of copper. ( Z of copper is 29 ) ( OR ) Monochromatic X – rays of wavelength 1
A o when falls on a crystal, successive reflections take place at angles 30 o
and 45 o respectively. Find the lattice constant of the crystal
47. Explain
the variation photo electric current with the applied voltage.
48. Explain
Einstein’s theory of photoelectric effect.
49. Explain
length contraction.
50. Write
a short notes on time dilation.
51. The
time interval measured by an observer at rest is 2.5 X 10 -8 s. What is the
time interval as measured by the observer moving with a velocity v = 0.73 C.
52. Lithium
has a work function of 2.3 eV. It is exposed to light
of wavelength 4.8 X 10 -7 m. Find the maximum kinetic energy with which the
photoelectron leaves the surface.
53. Derive
an expression for de Broglie waves.
54. Explain
the construction and working of an electron microscope.
55. Derive
Einstein’s mass energy equivalence.
56. Explain
the construction and the working of a photo emissive cell.
57. State
any five uses of the photo electric cells.
58. State
the laws of photoelectric emission.
59. Explain
the BE / A curve.
60. Explain
Soddy-Fajan’s radioactive displacement law.
61. Explain
the construction and the working of Geiger-Muller counter.
62. Explain
how carbon-nitrogen cycle can account for the production of stellar energy.
63. A
reactor is developing energy at the rate of 32 MW. Calculate the required
number of fissions per second of 92 U 238 . Assume that energy per fission is
200 MeV.
64. Explain
the working of half wave rectifier .
65. Explain
the action of OP – AMP as difference amplifier.
66. Explain
N- type semiconductor.
67. Explain
the working of a transistor amplifier.
68. The
gain of the amplifier is 100. 5% of the output voltage is fed back into the
input through a negative feedback network. Find the voltage gain after feedback
.
69. Explain
the reflection of electromagnetic waves by the ionosphere.
70. Explain
the amplitude modulation.
71. Explain
the frequency modulation.
72. Write
a short notes on FAX.
73. In a
broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency
range 100 – 5000 Hz. Find ( i ) maximum and minimum
frequencies of USB, ( ii ) maximum and minimum frequencies of LSB and ( iii )
width of the channel.