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NCERT Solutions for class 12 Physics | Chapter 1 - Electric Charges and Fields

Questions
1 The unit of electric dipole moment is
A newton
B coulomb
C farad
D debye

Answer:debye
2 The force per unit charge is known as
A electric flux
B electric field
C electric potential
D electric current

Answer:electric field
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3 The surface considered for Gauss’s law is called
A Closed surface
B Spherical surface
C Gaussian surface
D Plane surface

Answer:Gaussian surface
4 Consider a region inside which, there are various types of charges but the total charge is zero. At points outside the region
A the electric field is necessarily zero.
B the electric field is due to the dipole moment of the charge distribution only.
C the dominant electric field is inversely pro-portional to r3, for large r (distance from ori-gin).
D the work done to move a charged particle along a closed path, away from the region will not be zero.

Answer: the dominant electric field is inversely pro-portional to r3, for large r (distance from ori-gin).
5 The SI unit of electric flux is
A N C-1 m-2
B N C m-2
C N C-2 m2
D N C-1 m2

Answer:N C-1 m2
6 Which of the following statements is not true about Gauss’s law?
A Gauss’s law is true for any closed surface.
B The term q on the right side side of Gauss’s law includes the sum of all charges enclosed by the surface.
C Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry.
D Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law

Answer:Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry.
7 Electric field lines provide information about
A field strength
B direction
C nature of charge
D all of these

Answer:all of these
8 SI unit of permittivity of free space is
A Farad
B Weber
C C2N-1 m-2
D C2N-1 m-2

Answer:C2N-1 m-2
9 Which of the following figures represent the electric field lines due to a single negative charge?
A Electric Charges and Fields
B Electric Charges and Fields
C Electric Charges and Fields
D Electric Charges and Fields

Answer:Electric Charges and Fields
10 A charge Q is placed at the centre of the line joining two point charges +q and +q as shown in the figure. The ratio of charges Q and q is

Electric Charges and Fields

A 4
B 1/4
C -4
D -1/4

Answer:-1/4
11 The minimum amount of charge observed so far is:
A 1 C
B 4.8 × 1-13 C
C 1.6 × 10-19 C
D 1.6 × 1019 C

Answer:1.6 × 10-19 C
12 The unit of intensity of electric field is :
A metre/volt
B Joule/newton
C Coulomb/newton
D Newton/coulomb

Answer:metre/volt
13 Quantisation of charge implies:
A Charge does not exist
B Charge exists on particles
C There is a minimum permissible magnitude of charge
D Charge can’t be created

Answer:There is a minimum permissible magnitude of charge
14 In non-uniform electric field, electric dipole experiences:
A torque only
B torque as well as net force
C force only
D None of these

Answer: torque as well as net force
15 The SI units of electric dipole moment are:
A C
B Cm-1
C Cm
D Nm-1

Answer:Cm
16 When placed in a uniform field, a dipole experiences:
A a net force
B a torque
C both a net force and torque
D neither a net force nor a torque

Answer: a torque
17 The dielectric constant of a metal is:
A 0
B 1
C ∞
D -1

Answer:∞
18 A soap bubble is given a negative charge, then its radius:
A increases
B decreases
C remains unchanged
D may increase or decrease

Answer: increases
19 A parrot comes and sits on a bare high power line. It will:
A experience a mild shock ‘
B experience a strong shock.
C get killed instantaneously
D not be affected practically

Answer: not be affected practically
20 An electron is sent in an electric field of magnitude 9.1 × 106NC-1. The acceleration produced in it is :
A 1.6 ms-2
B 1.6 × 1018ms-2
C 3.2 × 1018ms-2
D 0.8 × 1018 ms-2

Answer: 1.6 × 1018ms-2

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