Welcome to your Electric Charges and Fields MCQs Mock Test of Class 12th Physics
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Q.1. The unit of electric dipole moment is
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Q.2. Consider a region inside which, there are various types of charges but the total charge is zero. At points outside the region
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Q.3. The surface considered for Gauss’s law is called
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Q.4. The SI unit of electric flux is
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Q.5. Which of the following statements is not true about Gauss’s law?
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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
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Q.7. Calculate the flux through the cuboid shown in the figure for E = E0 y j :-
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Q.8. Charge is the property associated with matter due to which it produces and experiences
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Q.10. A body is positively charged, it implies that
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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
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Q.12. Which of the following is the best insulator?
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Q.13. If a body is negatively charged, then it has.....
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Q.14. When a body is charged by induction, then the body....
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Q.15. On charging by conduction, mass of a body may
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Q.16. Quantisation of charge implies
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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
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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 If the rod is then suddenly withdrawn, the charge left on the conductor will be
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Q.19. Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging
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Q.20. When a comb rubbed with dry hair attracts pieces of paper. This is because the
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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
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Q.22. Quantisation of charge was experimentally demonstrated by
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Q.23. In annihilation process, in which an electron and a positron transform into two gamma rays, which property of electric charge is displayed?
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Q.24. The law, governing the force between electric charges is known as
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Q.25. Coulomb’s law is true for
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Q.26. The value of electric permittivity of free space is
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Q.27. What happens when some charge is placed on a soap bubble?
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Q.28. When a glass rod is rubbed with silk, it
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Q.29. In general, metallic ropes are suspended on the carriers taking inflammable materials. The reason is ...
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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
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Q.31. When 10^(14) electrons are removed from a neutral metal sphere , the charge on it becomes
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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
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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
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Q.34. Electric field lines provide information about
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Q35. In annihilation process, in which an electron and a positron transform into two gamma rays, which property of electric charge is displayed?
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Q36. Charge is the property associated with matter due to which it produces and experiences
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Q.37. The electric field inside a spherical shell of uniform surface charge density is
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Q38. The SI unit of electric flux is
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Q39. Coulomb’s law is true for
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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
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Q.41. Electric field lines provide information about
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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
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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
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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
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Q.45. Which of the following statement is correct? The electric field at a point is
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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
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Q.47. Gauss’s law will be invalid if
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Q.48. SI unit of permittivity of free space is
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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
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Q. 50. The force per unit charge is known as
