Physics Class 12th Chapter-1 Electric Charges And Fields Most VVI Objective Questions

(B)1.6×10⁻¹⁹

(C) 2.99×10⁹

(D) -1.6×10⁻¹⁹

Ans:- (A)

Q.2. Permittivity of free space is

(A) 9×10⁹ mF⁻¹

(B) 1.6×10⁻¹⁹C

(C) 8.85×10⁻¹²Fm⁻¹

(D) 8.85×10⁻⁹Fm⁻¹

Ans:- (C)

Q.3. The unit of electric field intensity is

(A) NC (Newton Coloumb)

(B) NC⁻¹ (Newton/Coloumb)

(C) Vm (Volt m)

(D) CN⁻¹ (Coloumb/Newton)

Ans:- (B)

Q.4. 1 Statcoulomb equals….coulomb.

A.3×10⁹

B.3×10⁻⁹

C.1/3×10⁹

D.1/3×10⁻⁹

Ans:- (D)

Q.5.The number of electrons that should be removed from an uncharged body to have a charge of one coloumb is

A.6.25×10¹⁸

B.6.25×10⁸

C.6.023×10²³

D.None of these

Ans:- (A)

Q.6. Electrostatic field is

(A) conservative

(B) non-conservative

(C) somewhere conservative and somewhere non-conservative

(D) None of these

Ans:- (A)

Q.7. Charges A and B attract each other. Charges B and C attract each other. Then A and C.

(A) will attract each other

(B) repel each other

(C) will not effect each other

(D) A , B and C

Ans:- (D)

Q.8. 1 Coulomb charge is equal to

A.3×10⁹ e.s.u.

B.9×10⁹ e.s.u.

C.8.85×10⁻¹² e.s.u.

D.None of these

Ans:- (A)

Q.9. The charge on a body is written as Q=ne whose e=1.6×10⁻¹⁹ C. The value n will be

A.0,1,2,3….

B.0, ±1, ±2, ±3 , ….

C.0,-1,-2,-3,…

D.None of these

Ans:- (B)

Q.10.Force between two charged particles situated at a distance is r. If distance between the two is made half, then the value of electric force will be

(A) 4 F

(B) 2 F

(C) 1/4 F

(D) 1/2

Ans:- (A)

Q.11. Coloumbian force is


(A) Central force

(B) Electric force

(C) Both a and b

(D) None of these

Ans:- (C)

Q.12. The charge on any substance can not be less than

(A) 1.6×10⁻¹⁹C

(B) 3.2×10⁻¹⁹C

(C) 4.8×10⁻¹⁹

(D) 1C

Ans:- (A)

Q.13. When a body is charged ,its mass

(A) Increases

(B) Decreases

(C) Remains same

(D) May increase or decrease

Ans:- (D)

Q.14. The dimensional formula of electric field intensity is

(A) [MLT⁻²A⁻¹]

(B) [MLT⁻³A⁻¹]

(C)ML²T⁻³A⁻²]

(D) [ML²T²A²]

Ans:- (B)

Q.15. Which of the laws gives the force between two charges at rest ?

(A) Gauss theorem

(B) Kirchhoff’s rules

(C) Coulomb’s law

(D) Faraday’s laws

Ans:- (C)

Q.16. The value of 1/4πε₀ is

(A) 9×10⁹ Nm²C⁻²

(B) 8.85×10⁻¹² Nm²C⁻²

(C) 9×10⁻⁹ Nm²C⁻²

(D) zero

Ans:- (B)

Q.17. There are two identical spheres A and B. A is given +Q charge and B is given -Q charge

(A) Mass of A increases

(B) Mass of B increases

(C) No effect on Mass

(D) None

Ans:- (B)

Q.18. The S.I. unit of electric flux is

(A) Weber

(B) Nm²C⁻¹ 

(C) Newton/m

(D) m²/s

Ans:- (B)

Q.19. The total charge on a electric dipole is

(A) Zero

(B) Negative

(C) Positive

(D) Infinite

Ans:- (A)

Q.20. The electric field intensity at infinite distance from an electric charge is

(A) Infinite

(B) Zero

(C) 9×10⁹V/m

(D) None of these

Ans:- (B)

Q.21. Unit of surface density of charge is


(A) Coulomb/meter²

(B) Newton meter⁻¹

(C) Coulomb Volt⁻¹

(D) Coulomb meter

Ans:- (A)

Q.22. The electric field at a point near an infinite thin sheet of charged conductor is

(A) ∈₀σ

(B) σ/∈₀

(C) σ/2∈₀

(D) σ∈₀/2

Ans:- (C)

Q.23. A surface encloses an electric dipole. The total electric flux over the surface is

(A) Infinite

(B) Zero

(C) q/∈₀

(D) None of these

Ans:- (B)

Q.24. When a soap bubble is charged, its radius

(A) Increases

(B) Decreases

(C) Remains the same

(D) Becomes zero

Ans:- (A)

Q.25. The electric field intensity inside a hollow spherical charged conductor is

(A) Infinite

(B) Zero

(C) Positive and greater than 1

(D) None

Ans:- (B)

Q.26. When a body becomes negatively charged, its mass

(A) Decreases

(B) Increases

(C) Remains the same

(D) None of these

Ans:- (B)

Q.27. The value of electric field inside a charged spherical conductor is

(A) σ/∈₀

(B) zero

(C) ∈₀σ

(D) σ²/∈₀

Ans:- (B)

Q.28. Minimum number of capacitors of 2μF each required to obtain a capacitance of 5μF will be

(A) 4

(B) 3

(C) 5

(D) 6

Ans:- (A)

Q.29. Surface charge density of a conductor is σ. Electric field near it is

(A) σ/2∈₀

(B) σ/∈₀

(C) 2σ/∈₀

(D) σ/3∈₀

Ans:- (B)

Q.30. Force of attraction between the plates of a parallel plate capacitor is

(A) -q²/2∈₀Ak

(B) q³/2∈₀A

(C) q/∈₀Ak

(D) q²/2∈₀A²k

Ans:- (A)

Q.31. If the surface is parallel to the electric field , in this case the electric flux is 
(A) maximum 
(B) zero 
(C) infinity
(D) none of these
Ans:- (B) 
Q.32. Debye is the unit of 
(A) charge 
(B) polarization
(C) electric dipole moment 
(D) none 
Ans:- (C) 
Q.33. The dielectric constant of an insulator can not be 
(A) 1.5
(B) 3 
(C) 4.5 
(D) infinity 
Ans:- (D)
Q.34. The permittivity of vaccum is 
(A) 1
(B) more than 1 
(C) less than 1 but not zero 
(D) zero 
Ans:- (C) 
Q.35. The direction of dipole moment is 
(A) from negative charge to positive charge 
(B) from positive charge to negative charge
(C) perpendicular to the axis
(D) none of these 
Ans:- (A) 
Q.36. If the surface is parallel to the electric field, in this case the electric flux is 
(A) maximum 
(B) zero
(C) infinity 
(D) none of these 
Ans:- (B)
Q.37. If sphere of bad conductor is given charge then it is distributed on 
(A) surface
(B) surface and also inside the surface
(C) only inside the surface
(D) none of these
Ans:- (D)
Q.38. Electric dipole moment is 
(A) vector quantity
(B) scalar quantity 
(C) ratio
(D) none of these 
Ans:- (A)
Q.39. A charge is enclosed by the surface of radius r.  if the radius is increased twice of the previous them electric flux will be
(A) increased
(B) decreased
(C) remains unchanged 
(D) none of these
Ans:- (C) 
Q.40. By which method electric charge can produce is 
(A) by friction
(B) by induction 
(C) both ‘A’ and ‘B’
(D) all of above 
Ans:- (C) 

 

 

 

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