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

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Free download in PDF Class 12 Physics Chapter 1 Electric Charges and Fields Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(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]
[B]
[C]
[D]
Answer:
(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

[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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