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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) If two conducting sphere are connected after charging separately then:
[A] Electrostatic energy sphere energy will remain conserved
[B] Electrostatic energy charges remains conserved
[C] Electrostatic energy energy and charge remains conserved
[D] None
Answer: Electrostatic energy charges remains conserved
(2) Two point charges +8q and -2q are located at ,v = O and ,v = L respectively. The location of a point on the .v-axis at which the net electric field due to these two point charges b is zero :
[A] 4L
[B] 8L
[C] L/4
[D] 2L
Answer: 2L

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(3) The conservation of electric charge implies that:
[A] Charge can’t be created
[B] Charge can’t be destroyed
[C] The number of charged particle in the universe is constant
[D] Simultaneous creation of equal and opposite charges is permissible
Answer: Simultaneous creation of equal and opposite charges is permissible
(4) The ratio of electric force between two electrons to the gravitational force between them is of the order:
[A] 1042
[B] 1039
[C] 1036
[D] 1
Answer: 1042
(5) The belt of a Vande Graaf generator gets charge by :
[A] corona discharge
[B] induction
[C] electrification
[D] None of these
Answer: corona discharge
(6) The dimensional representation of cu will be :
[A] [MLT4 A2]
[B] [M-1L-3T4A2]
[C] [ML-2T ]
[D] None of these
Answer: [M-1L-3T4A2]
(7) Each of the two point charges are doubled and their distance is halved. Force of interaction becomes p times, w here p is :
[A] 1
[B] 4
[C] 1/16
[D] 16
Answer: 16
(8) The number of electron-taken out from a body to produce 1 coulomb of charge will be :
[A] 6.25 × 1018
[B] 625 × 1018
[C] 6.023 × 1023
[D] None
Answer: 6.25 × 1018
(9) Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :
[A] +3q
[B] +2q
[C] -3q
[D] -4q
Answer: +3q
(10) Electric field in a cavity of metal:
[A] depends upon the surroundings
[B] depends upon the size of cavity
[C] is always zero
[D] is not necessarily zero
Answer: is not necessarily zero
(11) Corona discharge takes place:
[A] at the surface of a conductor
[B] near the sharp points of a conductor
[C] outside the conductor
[D] at the centre of the conductor
Answer: near the sharp points of a conductor
(12) The number of electrons contained in one coulomb of charge is:
[A] 6.25 × 1018
[B] 6.25 × 1017
[C] 6.25 × 1019
[D] 1.6 × 1019
Answer: 6.25 × 1018
(13) 1 V m-1 equals to:
[A] 1 N
[B] 1 Mm-1
[C] 1 NC-1
[D] 1 J-1
Answer: 1 NC-1
(14) Coulomb’s law in vector form can be written as

where ε0 is the permitivity of free space. The SI units of ε0 will be:

[A] N-1m-2C-2
[B] Nm-2C2
[C] N-1m-2C9.y
[D] Nm-2C2
Answer: N-1m-2C9.y
(15) If sphere of bad conductor is given charge then it is distributed on:
[A] surface
[B] inside the surface
[C] only inside the surface
[D] None
Answer: None
(16) If an electric dipole is kept in a uniform electric field then resultant electric force on it is :
[A] always zero
[B] never zero
[C] depend upon capacity of dipole
[D] None
Answer: always zero
(17) Which one of the following is the unit of electric field?
[A] Coulomb
[B] Newton
[C] Volt
[D] N/C
Answer: N/C
(18) 1 coulomb is equal to:
[A] 3 × 109 e.s.u.
[B]
[C] 3 × 1010 e.s.u.
[D]
Answer: 3 × 109 e.s.u.
(19) The work done in rotating an electric dipole in an electric field:
[A] W = ME (1 – cos θ)
[B] W = ME tan θ
[C] W = ME sec θ
[D] None
Answer: W = ME (1 – cos θ)
(20) The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be :
[A] straight line
[B] parabola
[C] hyperbola
[D] None of these
Answer: None of these

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