# Electric Charges and Fields MCQs Mock Test of Class 12th Physics

Welcome to your Electric Charges and Fields MCQs Mock Test of Class 12th Physics

1.
Q.1. The unit of electric dipole moment is

2.
Q.2. Consider a region inside which, there are various types of charges but the total charge is zero. At points outside the region

3.
Q.3. The surface considered for Gaussâ€™s law is called

4.
Q.4. The SI unit of electric flux is

5.
Q.5. Which of the following statements is not true about Gaussâ€™s law?

6.
Q.6. Four charges are arranged at the comers of a square ABCD, as shown. The force on the charge kept at the centre O is

7.
Q.7. Calculate the flux through the cuboid shown in the figure for E = E0 y j :-

8.
Q.8. Charge is the property associated with matter due to which it produces and experiences

9.
Q.9. Charge is

10.
Q.10. A body is positively charged, it implies that

11.
Q.11. On rubbing, when one body gets positively charged and other negatively charged, the electrons transferred from positively charged body to negatively charged body are

12.
Q.12. Which of the following is the best insulator?

13.
Q.13. If a body is negatively charged, then it has.....

14.
Q.14. When a body is charged by induction, then the body....

15.
Q.15. On charging by conduction, mass of a body may

16.
Q.16. Quantisation of charge implies

17.
Q.17. If an object possesses an electric charge, it is said to be electrified or â€¦ A â€¦ When it has no charge, it is said to be â€¦ B â€¦ Here, A and B refer to

18.
Q.18. A positively charged rod is brought near an uncharged conductor. If the rod is then suddenly withdrawn, the charge left on the conductor will be

19.
Q.19. Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging

20.
Q.20. When a comb rubbed with dry hair attracts pieces of paper. This is because the

21.
Q.21. When some charge is transferred to â€¦Aâ€¦ it readily gets distributed over the entire surface of â€¦ Aâ€¦ If some charge is put on â€¦ Bâ€¦, it stays at the same place. Here, A and B refer to

22.
Q.22. Quantisation of charge was experimentally demonstrated by

23.
Q.23. In annihilation process, in which an electron and a positron transform into two gamma rays, which property of electric charge is displayed?

24.
Q.24. The law, governing the force between electric charges is known as

25.
Q.25. Coulombâ€™s law is true for

26.
Q.26. The value of electric permittivity of free space is

27.
Q.27. What happens when some charge is placed on a soap bubble?

28.
Q.28. When a glass rod is rubbed with silk, it

29.
Q.29. In general, metallic ropes are suspended on the carriers taking inflammable materials. The reason is ...

30.
Q.30. Two charges q1 and q2 are placed in vacuum at a distance d and the force acting between them is F. If a medium of dielectric constant 4 is introduced around them, the force now will be

31.
Q.31. When 10^(14) electrons are removed from a neutral metal sphere , the charge on it becomes

32.
Q.32. Two similar spheres having +Q and -Q charges are kept at a certain distance. F force acts between the two. If at the middle of two spheres, another similar sphere having +Q charge is kept, then it experiences a force in magnitude and direction as

33.
Q.33. A charge Q is divided into two parts of q and Q â€“ q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Q/q should be

34.
Q.34. Electric field lines provide information about

35.
Q35. In annihilation process, in which an electron and a positron transform into two gamma rays, which property of electric charge is displayed?

36.
Q36. Charge is the property associated with matter due to which it produces and experiences

37.
Q.37. The electric field inside a spherical shell of uniform surface charge density is

38.
Q38. The SI unit of electric flux is

39.
Q39. Coulombâ€™s law is true for

40.
Q.40. The electric field intensity due to an infinite cylinder of radius R and having charge q per unit length at a distance air r (r > R) from its axis is

41.
Q.41. Electric field lines provide information about

42.
Q. 42. Two point charges + 8q and - 2q are located at x = 0 and x = L respectively . The location of a point on the x axis at which the net electric field due to these two point charges is zero is

43.
Q.43. The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight is given by

44.
Q.44. In Fig. (i) two positive charges q2 and q3 fixed along the y-axis, exert a net electric force in the +x direction on a charge q1 fixed along the x-axis. If a positive charge Q is added at (x, 0) in figure (ii), the force on q1 is

45.
Q.45. Which of the following statement is correct? The electric field at a point is

46.
Q.46. A point charge +q is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is

47.
Q.47. Gaussâ€™s law will be invalid if

48.
Q.48. SI unit of permittivity of free space is

49.
Q.49. 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

50.
Q. 50. The force per unit charge is known as