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Physics Class 12th Chapter 2 Electrostatic Potential And Capacitance VVI Objective Questions | 12th Physics Objective Question Bihar Board English Medium

(A) High current

(B) High voltage

(C) High power

(D) High capacity

Ans:- (B)

Table of Contents

Q.2. A hollow sphere of radius 5 cm is charged to 10 volt. the potential at centre is

(A) Zero

(B) 10 volt

(C) Both a and b

(D) None of these

Ans:- (B)

Q.3. Dimensional formula of electric potential is

(A) [ML²T⁻³A⁻¹]

(B) [MLT⁻³A⁻¹]

(C) [MLT⁻³A⁻²]

(D) [ML²T⁻³A⁻²]

Ans:- (A)

Q.4. Two condenser of 8μF and 4μF are connected in series. The potential difference across them is 1200 V. the potential difference across 8μF.F

(A) 400 volt

(B) 600 volt

(C) 800 volt

(D) 900 volt

Ans:- (A)

Q.5. If the uniform electric field exists along x-axis, then equipotential is in the direction of

(A) XY Plane

(B) XZ Plane

(C) YZ Plane

(D) Anywhere

Ans:- (C)

Q.6. If 1000 identical droplets is having capacity 5μF combine to form a big drop than capacity of big drop is

(A) 50μF

(B) 100μF

(C) 20μF

(D) None of these

Ans:- (A)

Q.7. If a proton is brought near another proton then its potential energy

(A) Increases

(B) Decreases

(C) Remains unchanged

(D) None of these

Ans:- (A)

Q.8. The amount of energy needed in changing a condenser of capacitance 15μF to 20kV isF

(A) 3KJ

(B) 10KJ

(C) 100KJ

(D) 5KJ

Ans:- (A)

Q.9. A charge Q is placed at a distance r from a point P. The potential at P is V. A charge -Q is placed at distance 2r from P. The potential at P will be

(A) Zero

(B) 2V₀

(C) V₀/2

(D) -V₀

Ans:- (C)

Q.10. The work done in rotating an electric dipole is an electric field is

(A) W=ME(1-cosθ)

(B) W=MEtanθ

(C) W=MEsecθ

(D) W=ME

Q.11. 1 eV is equal to

(A) 1J

(B) 1.6×10⁻¹⁹J

(C) 1.6×10⁻¹³J

(D) None of these

Ans:- (B)

Q.12. S.I. unit of permittivity may be expressed as

(A) Vm⁻¹

(B) NC

(C) Vm

(D) Fm⁻¹

Ans:- (D)

Q.13. Vm⁻¹ is the SI unit of

(A) Electric field

(B) Potential

(C) Capacitance

(D) Charge

Ans:- (A)

Q.14. Debye is the unit of

(A) Charge

(B) Potential

(C) Electric dipole moment

(D) None

Ans:- (C)

Q.15. A work of 20 joule is needed in carrying a charge of 2 coulomb. from one point to the other. potential difference will be

(A) 10

(B) 20

(C) 5

(D) 2

Ans:- (A)

Q.16. The capacity of a conductor is inversely proportional to

(A) Area of plates

(B) Permittivity of medium between plates

(C) Distance between plates

(D) None of these

Ans:- (C)

Q.17. A spherical conductor is charged. The electric field intensity at its centre will be

(A) ∞

(B) 0

(C) Both A and B

(D) None of these

Ans:- (B)

Q.18. The dielectric constant of metal is

(A) 0

(B) ∞

(C) 1

(D) -1

Ans:- (B)

Q.19. When + Q charge is placed inside any spherical surface. then total flux coming out from the whole surface will be

(A) q×∈₀

(B) q/∈₀

(C) ∈₀/q

(D) q²/∈₀

Ans:- (B)

Q.20. If a dielectric is placed between two plates of a parallel plate capacitor, the value of capacitance

(A) Increases

(B) Remains constant

(C) Decreases

(D) None of these

Ans:- (A)

Q.21. The nature of capacity of electrostatic capacitor depends on 

(A) shape 

(B) size

(C) thickness of plates

(D) area

Ans:- (D) 

Q.22. The electric potential of the Earth is considered to be 

(A) positive

(B) negative

(C) zero 

(D) none of these

Ans:- (C) 

Q.23. A capacitor of capacitance 6.0 μF is charged at 100 volt. The energy  stored in the capacitor is 

(A) 0.6 Joule 

(B) 0.06 Joule 

(C) 0.03 Joule 

(D) 0.3 Joule 

Ans:- (C) 

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