Welcome to your Electric Charges and Fields MCQs Mock Test of Class 12th Physics
Q.1. The unit of electric dipole moment is
Q.2. Consider a region inside which, there are various types of charges but the total charge is zero. At points outside the region
Q.3. The surface considered for Gauss’s law is called
Q.4. The SI unit of electric flux is
Q.5. Which of the following statements is not true about Gauss’s law?
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
Q.7. Calculate the flux through the cuboid shown in the figure for E = E0 y j :-
Q.8. Charge is the property associated with matter due to which it produces and experiences
Q.10. A body is positively charged, it implies that
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
Q.12. Which of the following is the best insulator?
Q.13. If a body is negatively charged, then it has.....
Q.14. When a body is charged by induction, then the body....
Q.15. On charging by conduction, mass of a body may
Q.16. Quantisation of charge implies
Q.17. If an object possesses an electric charge, it is said to be electrified or … A … When it has no charge, it is said to be … B … Here, A and B refer to
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 If the rod is then suddenly withdrawn, the charge left on the conductor will be
Q.19. Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging
Q.20. When a comb rubbed with dry hair attracts pieces of paper. This is because the
Q.21. When some charge is transferred to …A… it readily gets distributed over the entire surface of … A… If some charge is put on … B…, it stays at the same place. Here, A and B refer to
Q.22. Quantisation of charge was experimentally demonstrated by
Q.23. In annihilation process, in which an electron and a positron transform into two gamma rays, which property of electric charge is displayed?
Q.24. The law, governing the force between electric charges is known as
Q.25. Coulomb’s law is true for
Q.26. The value of electric permittivity of free space is
Q.27. What happens when some charge is placed on a soap bubble?
Q.28. When a glass rod is rubbed with silk, it
Q.29. In general, metallic ropes are suspended on the carriers taking inflammable materials. The reason is ...
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
Q.31. When 10^(14) electrons are removed from a neutral metal sphere , the charge on it becomes
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
Q.33. A charge Q is divided into two parts of q and Q – q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Q/q should be
Q.34. Electric field lines provide information about
Q35. In annihilation process, in which an electron and a positron transform into two gamma rays, which property of electric charge is displayed?
Q36. Charge is the property associated with matter due to which it produces and experiences
Q.37. The electric field inside a spherical shell of uniform surface charge density is
Q38. The SI unit of electric flux is
Q39. Coulomb’s law is true for
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
Q.41. Electric field lines provide information about
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
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
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
Q.45. Which of the following statement is correct? The electric field at a point is
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
Q.47. Gauss’s law will be invalid if
Q.48. SI unit of permittivity of free space is
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
Q. 50. The force per unit charge is known as