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Part III – PHYSICS
(New Syllabus )
Time
Allowed : 3 Hours] (English Version) [Maximum Marks:150
PART I
N.B.: i) Answer all the questions.
ii) Choose and write the correct
answer.
iii) Each question carries one mark 30
X 1 = 30
1. Production of charges without actual contact is
known as
a. electrostatic induction b.conduction c.charging d.
induction
2. The amount of work done in
moving a 500mc charge between two
points on an equipotential surface is y
a.zero b.positive c.negative d.infinitive
3.
The Field at a point at a distance of an elelctric dipole is directly
proportional to
a. 1/x2 b.1/x3 c.1/x4 d.1/x3/2
4. Action of points is used in -----------------
a. Capacitor b.Vande graff c.
Lightening arrester d.both a & c
5. The field from a point
charge at 2m distance is 400V/m Then at --------- field will be 100V/m
a.50cm b. 4cm c. 4m d.
1/5m
6.
The unit of electric field
a. Nm2
C-1 b. H/m c. Ncm d. N/C
7. Which of the following is a
scalar
a.Drift
velocity b.Current density c.current
d.Electric
field
8. The unit of mobility number
is
a. mV-1s-1 b. m2V-1s-1 c.m2V-1s-3 d.
mV-1s-4
9. In which of the following
substance current pass through easily
a.
Quartz b.Mica c.Germanium d.Copper
10.
According to Joule’s heating law H =
a. I2t/V b. V2Rt c.VIt d. IR2t
11. Nichrome is used as a
heating element because it has
a.low
resistivity b.low melting point c.more
resistivity d.more sigma
12.
The expression for Biot savart law is dB =
a. m0Idl/4p r2 b. m0Idl sin q /4p r2
c. m0Idl x`r/4p r2 d.m0Idl x` r/4p r3
13. The magnetic field at a
distance x from the centre of a current carrying circular coil is proportional to
a. x2
b.x3 c. 1/x2 d.1/x3
14. The time period of
particle in cyclotron does not depend on
a.magentic
induction b.current c.velocity of the particle d.mass
of the particle
15. To convert an galvanometer
in to a voltmeter ---------resistance to
be connected in--------------
a.low
, series b.low ,
parallel c.high , series d.high , parallel
16. Electro magnetic induction
is not used in
a.Transformer b.Room
heater c. AC dynamo d. Choke coil
17. The angle between area and
area vector is
a.p b.p/2 c. 2p d. 0
18.
Lenz’z law based on the conservation of ----------------
a.
charge b. flux c.momentum d.energy
19.The self inductance of a
linear conductor is ----------
a.zero b.infinitive c.veryhigh d.very
low
20. Henry is nothing but
a.
Vs/A b. Wb/A c.Ws d.all of
these
21. Which of the following
does not allow a.c to pass through
a.resistor b.capacitor c. inductor d.all of these
22. In an AC circuit
a.averge
current is 0 b.square of
current is 0 c.average powerloss is 0 d.Ö2times of I rms
23. Motor rule is otherwise
known as
a.fleming
left b.fleming
right c.maxwell right d.
right palm
24. In an electromagnetic
waves ,power is transmitted in
a.equal
in both fields b.perpendicular to both
c.only electric field d.only in magnetic
field
25. Electormagnetic waves are
------------- waves
a
transverse b.longitudinal c.transverse or
longitudinal d.none of these
26. The idea of EM waves was
first proved experimentally by
a.Hertz b.Maxwell c.Farad d.Watt
27. ----------- confirmed the
exsistance of EM waves
a.Hertz b.Maxwell c.Farad d.Watt
28. The Phase difference
between electric and magnetic component in an EM wave is
a.p
b.p/2
c.2p d. 0
29. The speed of EM waves in
vacuum is
a. Öm 0 e0 b. 1/Öm 0e0 c. Öm 0/e0 d. Öe0 /m 0
30. Which of the following is
an optical active substance
a.NaCl b.KCl c.Na d.Cl
PART- II
N.B.: Answer any fifteen
questions 15X
3 = 45
31. Calculate current in a
conductor if 6.25 X 1018 electrons flow in one second.
32. Calculate the resistance
of a lamp rating 220 V and 1 A
33.
How will you increase the current sensitivity of a galvanometer?
34.
Explain how end rule is applied to find the polarity of a long solenoid
35.
What is neutral temperature?
36.
Nichrome is used as heating element. Comment on this
37. Draw the phase diagram of circuit with C only
38. Calculate the equation for
current if the rms of current is 30 A at 50 Hz
39.Define Thomspm coefficient
and write its unit.
40. Define Electromagnetic
induction.
41. Define I rms
42. Give the conditions for
clear interference bands.
43. Define drift velocity?
44. Define mobility?
45. State Ohm’s law?
46. Define Coulomb?
47. What is action of points?
48.
When unpolarised light is incident on a medium of m = 1.732, calculate ip
49. Why does the sky appear
blue in color?
50. What factors does optical
rotation depend upon?
PART III
N.B.: i)
Answer
the Question No. 60 compulsorily
ii) Answer any six of the remaining 11 questions.
iii) Draw diagrams wherever necessary
7X 5 = 35
51 Resistance of a coil at 200C
is at 65 ohm and at 500C is 70
ohm calculate temperature
Coefficient of resistance.
52. Explain lens law on the
conservation of energy
53.Write short notes on three
phase generator
54. Explain the a.c circuit
with resistance only
55. Find rms of current in a circuit with a capacitor
of capacitance 2microfaradwithfrequencyof 1000 Hz
And the rms
of voltage is 10 V
56. Write a note on Nichol
prism.
57. The fringe width in
Young’s expt with l = 5000 A is 0.6 cm. Find the new width if ‘D’ is halved.
58.Give the properties of
electric lines of force.
59.Explain
current sensitivity of a galvanometer
60.A long solenoid of length
3m has 4000 turns. Find current through the solenoid if the B at centre is 8 X
10-3 T.
(OR)
In a TG 1 A current produces a deflection
of 30o .Find the current required to produce the deflection of 60o.
61. Give the principle of a
capacitor.
62. Give Gauss law with any
one application.
PART –IV
N.B.: i) Answer
any four questions in detail
ii) Draw diagrams wherever necessary 4X
10 = 40
63.
Deduce an expression for field at a point on its axial line of an electric
dipole.
64.
Deduce the relation for the magnetic induction at a point along the axis of
a
circular coil carrying current.
65. Write down the method of
inducing emf by changing the orientation
of the coil.
66. Write a detailed note on
LCR circuit with the help of the phaser diagram.
67. Deduce an expression for
the capacity of a parallel plate capacitor with an dielectric?
68. With a neat diagram,
explain the construction and working of an AC generator.
69.Derive an expression for b of interference fringes in Young’s experiment.
70.What are Newton’s rings? Find the radius of nth
dark ring.
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