# Electrostatic Potential and Capacitance MCQs Mock Test of Class 12th Physics

Welcome to your Electrostatic Potential and Capacitance MCQs Mock Test of Class 12th Physics

1.
Q 1. A polythene piece rubbed with wool is found to have a negative charge of 6.4 × 10-9c. How many electrons have been transferred during the process?

2.
Q 2. In the above question:

3.
Q 3. In previous question, mass transferred to polythene is:

4.
Q 4. What is the number of electrons in 100 g water?

5.
Q 5. A uniform electric field of 10 NC-1 exists in the vertically downward direction. What is the increase in the electric potential asonegoes up through a height of 300 cm ?

6.
Q6. The electric potential of earth is taken as:

7.
Q7. Equipotential surfaces

8.
Q8. Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor ?

9.
Q9. The electric potential V at any point O (x, y, z all in metres) in space is given by V = 4x² volt. The electric field at the point (1 m, 0, 2 m) in volt/metre is

10.
Q10. Consider a uniform electric field in the z direction. The potential is not a constant

11.
Q11. Which of the following statement is true?

12.
Q12. The capacitance of a capacitor will decrease if we introduce a slab of:

13.
Q13. Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately

14.
Q14. A positively charged particle is released from rest in a uniform electric field. The electric potential energy of the charge

15.
Q15. For equipotential surfaces, which statement is not correct?

16.
Q16. A test charge is moved from lower potential point to a higher potential point. The potential energy of test charge will

17.
Q17. Twenty seven drops of mercury are charged simultaneously to the same potential of 10 volts. What will be potential if all the charged drops are made to combine to form one large drop ?

18.
Q18. The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is

19.
Q19. In a region of constant potential

20.
Q20. A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system

21.
Q21. If a conductor has a potential V ≠ 0 and there are no charges anywhere else outside, then

22.
Q22. The amount of work required to increase the distance between -6µC and 4µC from 6 cm to 18 cm will be :

23.
Q23. Which of the following options are correct? If a conductor has a potential V 4- 0 and there are no charges anywhere else outside, then

24.
Q24. ielectric constant for a metal is

25.
Q25. A bird sitting on a high power line:

26.
Q26. The surface density of charge is measure:

27.
Q27. In a parallel plate capacitor, the capacity increases if

28.
Q28. Choose the SI unit of electric potential energy :

29.
Q29. A capacitor is connected to a cell of emf E having some internal resistance r, the potential across the:

30.
Q30. The dimensions of fall of potential per unit distance are given by:

31.
Q31. Which of the following is blocked by a capacitor ?

32.
Q 32. Two copper spheres of the same radius, one solid and the other hollow, are charged to the same potential. Which will have more charge?

33.
Q33. The capacitance of a capacitor will decrease if we introduce a slab of:

34.
Q34. Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor ?

35.
Q35. In which of the following forms is the energy stored in a capacitor?

36.
Q36. Two conducting spheres of radii r1 and r2 are equally charged. The ratio of their potential is

37.
Q37. In a region of constant potential

38.
Q38. In which of the following forms is the energy stored in a capacitor?

39.
Q39. If a unit positive charge is taken from one point to another over an equipotential surface, then

40.
Q40. Twenty seven drops of mercury are charged simultaneously to the same potential of 10 volts. What will be potential if all the charged drops are made to combine to form one large drop ?

41.
Q41. The P.E. of an electric dipole is maximum when it makes an angle θ with electric field. The value of θ is :

42.
Q42. The amount of work required to increase the distance between -6µC and 4µC from 6 cm to 18 cm will be :

43.
Q43. An electron initially at rest is accelerated through a potential difference of one volt. The energy gained by electron is:

44.
Q44. A bird sitting on a high power line:

45.
Q45. Choose the SI unit of electric potential energy :

46.
Q46 The capacitance of earth, viewed as a spherical conductor of radius 6408 km is:

47.
Q47. A capacitor is connected to a cell of emf E having some internal resistance r, the potential across the:

48.
Q48. If a +ve charge is moved from low to high potential region, the electric potential energy:

49.
Q49. A capacitor is connected across a battery and the plate separation of capacitor is increased without removing the battery, then:

50.
Q50. Two capacitors of 3 µF and 6 µF are connected in series with a battery of P.d. 12 V. The P.d. across 3µF and 6µF capacitors respectively will be :