# MCQ Questions for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance with Answer

MCQ Questions for Class 12 Physics Chapter 2 Download Free PDF: CBSE RBSE and NCERT Physics class 12 MCQs for Chapter 2 “Electrostatic Potential and Capacitance” is very important for the students who want to get good marks. Neet MCQs

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## MCQ Questions for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance with PDF

1. The concept of the lines of force in the study of electric field was introduced by______

(a) Edison
(c) Kirchhoff
(d) Fleming

2. Two charges q1 and q2 are kept at a certain distance in air. If a metal plate is placed between them, the force between them_____

(a) decreases
(b) increases
(c) does not change
(d) will be zero

3. 8 equally charged drops are combined to form a big drop. If the potential on each drop is 10 V, then the potential of the big drop will be__________

(a) 40 V
(b) 30 V
(c) 25 V
(d) 20 V

4. The SI unit of surtface integral of electric field is________

(a) V
(b) NIC
(c) Vm
(d) C/m2

5. The negative electric flux indicates that the net flux through the surface is_____

(a) outward
(b) inward
(c) may be outward or inward
(d) neither outward not inward

6. Two charges q1 and q2 are kept at a certain distance in air. If a dielectric (glass slab) is introduced between them, the force between the charges will_________

(a) increase
(b) decrease
(c) remain unchanged
(d) be doubled

7. The SI unit of electric flux is________

(a) volt / m²
(b) newton – metre
(c) volt- metre
(d) newton m² / (coulomb)³

8. The difference between electric and gravitational force is that__________

(a) the electric force is attractive while gravitational force is repulsive
(b) the electric force is repulsive while gravitational force is attractive
(c) the electric force is either attractive or repulsive while gravitational force is always attractive
(d) the electric force is always repulsive while the gravitational force may be repulsive or attractive.

9. Van de Graaff generator is used to__________

(a) produce high a.c. potential
(b) measure high P.D.
(c) produce high d.c. potential
(d) compare high a.c. and d.c. potentials

10. Ampere second is a unit of__________

(a) Capacitance
(b) Power
(c) Current
(d) Charge

11. Van de Graaff generator produces________

(a) high voltage and high current
(b) high voltage and low current
(c) high current and low voltage
(d) low current and low voltage

12. Van de Graaff generator_________

(a) is an electromagnetic machine
(b) is an electrostatic machine
(c) is an electrodynamic machine
(d) is used to produce charged particles like protons

13. Which is the correct relation?

(a) Charge = Potential/ Capacity
(b) Capacity = Potential x Charge
(c) Potential = Charge/ Capacity
(d) Potential = Capacity x Charge

14. A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are now moved apart by means of insulated handles_________

(a) the charge on the capacitor increases
(b) the voltage across the plates decreases
(c) the electrostatic energy stored in the capacitor increases
(d) the capacitance increases

15. If we decrease the distance between the two plates of a parallel plate capacitor, then its capacitance will_______

(a) decrease
(b) increase
(c) remains the same
(d) first increases and then decreases

16. A parallel plate capacitor is charged and the charging battery is disconnected. Then a dielectric slab is introduced between the plates. The quantity that remains unchanged is________

(a) potential
(b) capacity
(c)enerey
(d) charge

17. The dielectric constant of metals is________

(a) one
(b) zero
(c)infinity
(d) greater than one

18. A parallel plate condenser is fully charged by connecting it to a battery. The battery is then disconnected and the distance between the plates is increased. In this case, there is an increase________

(a) in its capacity
(b) in the charge
(c) in potential difference between the plates
(d) in the dielectric constant of the medium

19. Electric potential is_________

(a) a scalar quantity
(b) a vector quantity
(c) a dimensionless quantity
(d) always a positive quantity

20. The electric field at a p01nt inside a spher uniform surface density of charge is______

(a) constant
(b) directly proportional to the distance of the point from the centre
(c) zero
(d) inversely proportional to the square of the distance of the point from the centre.

21. The SI unit of intensity of electric field is___________

(a) newton per coulomb
(b) newton per ampere
(d) dyne/coulomb
(c) erg/coulomb

22. The SI unit of electric intensity_____

(a) volt / metre
(b) newton –coulomb
(d) volt x metre
(c) volt / metre²

23. If we measure the intensity of the electric field (E) at various points between the surface and the centre of a uniformly charged spherical conductor we find that the intensity of electric field_________

(a) goes on increasing
(b) goes on decreasing
(c) is zero at all points
(d) remains the same at all points

24. If a unit charge is taken from one point to another point over an equipotential surface, then___________

(a) work is done on the charge
(b) work is done by the charge
(c)work done on the charge is constant
(d) no work is done

25. The electric potential due to the nucleus of the hydrogenatom at a distance of 5.3 x 10-¹¹ m is 27.2 V. What is the potential due to the helium nucleus at the same distance?

(a) 27.2V
(b) 54.4 V
(c) 13.6 V
(d) 27.2 V

26. In practice, earth is chosen as a place of zero electric potential because it is___________

(a) non conducting
(b) has a very large radius
(c) keeps on gaining and losing equal number of charges
(d) has almost a constant potential, which is treated as a reference zero potential

27. The unit of absolute permittivity of a medium is________

(a) Joule/Coulomb
(b) Newton-Metre

28. The potential difference betweer two plates, separated by a distance  of 2 cm. The linear charge density is___________

(a) 10 V/m
(b) 100 V/m
(c) 200 V/m
(d) 500 V/m

29. An electric charge produces an electric intensity of 500 N/C, at a point in air. If the air is replaced by a medium of dielectric constant 2.5, then the intensity of the electric field due to the same charge at the same point will be________

(a) 100 N/C
(b) 150 N/C
(c) 200 N/C
(d) 300 N/C

30. The electric potential at the surface of an atomic nucleus having z = 50 and radius = 9.0 x 10-¹³ cm is________

(a) 80 volt
(b) 9 volt
(c) 8 x 10⁶ volt
(d) 9 x 10⁶ volt

31. The main function of a capacitor is to_________

(a) block the flow of current
(b) help the flow of current
(c) dissipate heat
(d) store the energy

32. M and N are the plates of unequal areas of a parallel plate capacitor. Let A1 and A2 be the areas of M and N. Let A1 > A2. M and N are connected to the +ve and -ve terminals of a battery. If Q+ and Qare the charges on the plates M and N respectively, then_____________

(a) Q> Q
(b) Q <Q
(c) Q= Q
(d) Q very large and Q is negligible

33. A dielectric slab is introduced between the plates of a parallel plate charged capacitor. Which one of the following quantities will not change?

(a) the charge on the capacitor
(b) the electric field between the plates of the capacitor
(c) the energy stored in the capacitor
(d) the potential difference between the plates.

34. The separation between the plates of a charged parallel plate capacitor is doubled by keeping the charge constant. In this case___________

(a) potential difference is halved
(b) the capacitance is doubled
(c) the p.d. between the plates is doubled
(d) the capacitance is halved but the energy of the capacitor is not changed

35. The capacitance of a parallel plate capacitor depends upon_________

(a) thickness of the plate
(b) mass of the plate
(c) density of the plate
(d) area of the plate

36. A capacitor of capacity C is connected to a power source then disconnected from the source and the spacing between its plates is reduced to half. Which one of the following  quantities is reduced ___________

(a) Charge
(b) Capacitance
(c) Potential difference

37. A parallel  plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved apart by means of insulating handles, then__________

(a) the charge on the capacitor is increased
(b) the capacitance is increased
(c) the voltage across the plates is increased
(d) the voltage across the plates is decreased

38. A parallel plate air capacitor has a capacity of 2 pF. If the separation between its plates is doubled and a mica sheet is introduced between its plates, its capacity becomes 6 pF. What is the dielectric constant of mica ?

(a) 6
(b) 5
(c) 4
(d) 3

39. The work done in placing a charge of 8 uC on a condenser of capacity 100 nF is________

(a) 16 x 10-⁵ J
(b) 32 x 10-⁶ J
(c) 3.2 x 10-⁴ J
(d) 16 x 10-⁴ J  