PART – A
I. Pick the correct option among the four given options for ALL of the following
questions: 15 × 1 = 15
1. Physical quantity measured in terms of "coulomb" is
a) electric charge b) electric current c) electric flux d) electric field
Ans a) electric charge
2. The electric field inside the cavity of a charged conductor is zero, this is known as
a) charging b) grounding c) electrostatic shielding d) electrostatic induction
Ans c) electrostatic shielding
3. An example for polar molecule is:
a) oxygen molecule b) nitrogen molecule c) water molecule d) hydrogen molecule
Ans c) water molecule
4. The magnitude of the drift velocity per unit electric field is
a) mobility b) drift velocity c) relaxation time d) resistivity
Ans a) mobility
5. The device used to accelerate charged particle is
a) electroscope b) cyclotron c) galvanometer d) ammeter
Ans b) cyclotron
6. The net magnetic flux through any closed surface is zero is in accordance with
a) Gauss's law in magnetism b) Gauss's law in electrostatics
c) Ampere's circuital law d) Biot-Savart's law
Ans a) Gauss's law in magnetism
7. S.I. unit of mutual inductance of pair of coils is
a) henry b) ohm c) farad d) ohm-metre
Ans a) henry
8. If the number of turns of a solenoid is doubled, the self inductance of the solenoid will
a) remains unchanged b) be doubled c) be halved d) becomes four times
Ans d) becomes four times
9. The relation between peak value of current (im) and rms value of current (I) is
Ans a) I =im
\root 2
10. The ultraviolet region of the electromagnetic spectrum lies between
a) X-ray region and visible region b) Microwave region and radio-wave region
c) -rays region and X-rays region d) Visible region and microwave region
Ans a) X-ray region and visible region 1
11. Snell's law of refraction invalid at an angle of incidence(i) is
a) i = 300
b) i = 60o
c) i = 0o
d) i = 90o
Ans c) i = 0o
12. When a point source of light is placed at the principal focus of a thin convex lens, the shape
of the emergent wave front is
a) Spherical convergent wave front b) Spherical divergent wave front
c) Plane wave front d) Cylindrical wave front
Ans c) Plane wave front
13. C.J. Davisson – L.H. Germer experiment proved:
a) wave nature of electrons b) particle nature of electrons
c) wave nature of light d) particle nature of light
Ans a) wave nature of electrons
14. Function of moderator in a nuclear reactor is
a) to slow down fast neutrons b) to absorb the neutrons
c) to reduce heat energy d) to control the chain reaction
Ans a) to slow down fast neutrons
15. Energy gap (Eg) between the valence band and the conduction band for conductor is
a) Eg = 0 b) Eg < 3eV c) Eg > 3eV d) Eg = 3eV
Ans a) Eg = 0 1
II. Fill in the blanks by choosing appropriate answer given in the brackets for ALL
the following questions: 5 × 1 = 5
(Curie temperature, electric dipole, transverse, isotopes, zener diode)
16. A pair of equal and opposite point charges q and -q separated by a distance 2a is an ____________.
Ans electric dipole 1
17. Temperature of transition from ferromagnetism to paramagnetism is called ___________.
Ans Curie temperature 1
18. Phenomenon of polarisation proves the ___________ nature of light waves.
Ans transverse 1
19. Nuclei having same atomic number and different mass number are called ____________.
Ans isotopes 1
20. ____________ is used as voltage regulator.
Ans Zener diode
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