1.
Electric flux coming out of a single Na+ ion is _________ Nm2C-1
a) 1.8*10-8
b) 1.8*10-10
c) 5.4*10-8
d) 3.6*10-8
2. Gauss’s Law cannot be applied in ________
a) Hollow sphere
b) Solid sphere
c) Cube
d) Unbounded surface
3. If a 10C charge is placed in a medium having relative permittivity 5.4, what will be
the amount of flux coming out of that charge?
a) 1*1011 Nm2C-1
b) 2.1*1011 Nm2C-1
c) 2.1*1010 Nm2C-1
d) 7.1*1011 Nm2C-1
4. A non-conducting cube of side length 1m has a spherical cavity of radius 0.1m inside
it. The system has a charge density of 2.5 C/m3. What is the total flux coming out of
the surface of the cube?
a) 2.8*1031 Nm2C-1
b) 2.8*1011 Nm2C-1
c) 5.7*1011 Nm2C-1
d) 0.2*1011 Nm2C-1
5. Net inward and outward flux of a closed surface are ∅1 and ∅2. What is the charge
enclosed inside the surface?
a) Zero
b) -(∅1-∅2)εo
c) (∅1-∅2)εo
d) /
6. Two cylindrical pipes having radius 2m and 5m are placed coaxially. The inner
cylinder has total charge 1C and the outer sphere has total charge 2C. What will be
the nature of electric field intensities at different distances from the axis of the
cylinders?
a)
b)
c)
d)
7. The electric field lines diverge from _______
a) Positive charge
b) Negative charge
c) Dipole
d) Zero potential point
8. Consider the lines of force as shown in the figure. Two unit positive charges are kept
at points A and B.
a) Charge at A will suffer greater force
b) Charge at B will suffer greater force
c) Force at both points will be same but non-zero
d) Force at both points will be the same
9. Field lines due to a positive point charge are _______
a)
b)
c)
d)
10. Two unit positive charges are kept at coordinates (0, 0) and (10, 0). What will be the
variation of the electric field with respect to the distance between them?
a)
b)
c)
d)
11. 1 dyne/esu = _____ N/C
a) 3*104
b) 105
c) 3*105
d) 9*104
12. Two point charges 1C and -1C are placed 5mm away from each other forming a
dipole. What will be the field intensity at a point 15 cm away from the dipole on its
axis?
a) 1.66*109 N/C
b) 2.66*1016 N/C
c) 3*1018 N/C
d) 1.4*1016 N/C
13. The CO2 molecule is a dipole. The statement is ______
a) True
b) False
14. What is the dimension of electric flux?
a) [M L3 T-3 I-1]
b) [M L2 T-3 I-1]
c) [M L3 T-3 I1]
d) [M L3 T
15. Flux coming out from a balloon of radius 10 cm is 1.0*103 N.m2.C-1-1. If the radius of
the balloon is doubled, the flux coming out from the balloon will be _______
a) 0.5 times
b) 2 times
c) Same
d) 4 times
16. What is the correct diagram regarding the variation of an electric field with distance
from an electric dipole if the distance is very large than the dipole length?
a)
b)
c)
d)
17. ‘X’ is the phenomenon of making a region free from any electric field. Identify X.
a) Faraday’s cage
b) Electrostatic shielding
c) Gauss theorem
d) Corona discharge
18. What is the value of capacitance of a capacitor if it has a charge of 9C and voltage of
5V?
a) 1.8F
b) 45F
c) 4.5F
d) 8.1F
19. Find out the correct expression of the capacitance of a parallel plate capacitor
where ‘A’ is the area of the plates, ‘d’ is the distance between the plates and ‘ε0’is the
permittivity of the medium.
a) Aε0d
b) Adε0
c) dε0A
d) Aε0d
20. A parallel plate capacitor has a plate area of 100 cm2 and is separated by a distance
of 20 mm. Find its capacitance.
a) 6.425 × 10-12 F
b) 5.425 × 10-12 F
c) 4.425 × 10-12 F
d) 3.425 × 10-12 F
21. Find the equivalent capacitance of the combination shown below.
a) 7F
b) 5F
c) 6F
d) 8F
22. Find the energy stored in the capacitor between the terminals A and B of the
combination shown below. Given – Capacitance of each capacitor C = 1μF
a) 12 μF
b) 8 μF
c) 4 μF
d) 10 μF
23. Initially the potential difference of a 8 μF capacitor is 30 V. Then it is changed to 40
V. What is the increase in energy?
a) 28 × 10-4 J
b) 18 × 10-4 J
c) 8 × 10-4 J
d) 24 × 10-4 J
24. What is the maximum energy that can be stored in a capacitor?
a) Depends on the maximum area of the capacitor
b) Depends on the maximum resistance offered
c) Depends on the maximum electric field
d) Depends on the maximum current passing through the capacitor
25. What is the induced dipole moment developed per unit volume of a dielectric when
placed in an external electric field called?
a) Relative permittivity
b) Polarisation susceptibility
c) Electric susceptibility
d) Polarisation density
