Bihar Board - Class 12 Physics - Chapter 1: Electric Charges and Fields Multiple Choice Questions (MCQs)
For Class 12 Bihar Board, the chapter Electric Charges and Fields in Physics explain the fundamental concepts like Coulomb’s law, electric field, electric potential, and Gauss's law. You can find multiple-choice questions that help in mastering these topics and preparing effectively for exams on Vidyakul.
Multiple Choice Question
1. Which one of the following is the unit of electric field ?
(A) Coulomb
(B) Newton
(C) Volt
(D) N/C
Answer ⇒ (D) N/C
2. 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 ⇒ (A) always zero
3. The number of electron taken out from a body to produce 1 coulomb of charge will be:
(A) 6.25 x 1018
(B) 6.25 x 108
(C) 6.023 x 1023
(D) None
Answer ⇒ (A) 6.25 x 1018
4. The work done in rotating an electric dipole in an electric field :
(A) W = ME (1 – cosθ)
(B) W = ME tanθ
(C) W = ME secθ
(D) None
Answer ⇒ (A) W = ME (1 – cosθ)
5. 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 ⇒ (D) None
6. 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 ⇒ (D) is not necessarily zero
7. The dielectric constant of a metal is :
(A) 0
(B) 1
(C) ∞
(D) -1
Answer ⇒ (C) ∞
8. 1 coulomb is equal to :
(A) the measure of electric charge
(B)equal to the amount of charge from a current of one ampere flowing for one second.
(C) equal to the charge of 6.24 × 1018 electrons
(D) All of the above
Answer ⇒ (D) All of the above
9. Each of the two point charges are doubled and their distance is halved. Force 77 interaction becomes p times, where p is :
(A) 1
(B) 4
(C) 1/16
(D) 16
Answer ⇒ (D) 16
10. Coulomb’s law in vector form can be written as :
can be written F =140q1q2r2r
where 0 is the permitivity of free space. The SI units of 0 will be :
(A) N-1 m-2C-2
(B) N m-2 C2
(C) N-1 m-2 C2
(D) N m-2 C2
Answer ⇒ (C) N-1 m-2 C2
11. The dimensional representation of ε0 will be:
(A) [MLT4 A2]
(B) [M-1 L-3 T4 A2]
(C) [ML-2T2 A-2]
(D) None of these
Answer ⇒(B) [M-1 L-3 T4 A2]
12. 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 ⇒ (B) a torque
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