Physics Electrostatics Online Mcqs Test

Mustansar KhanLast Updated: October 13, 2025

Important Physics Electrostatics Question and Answer

Total Questions:	67
Time Allowed:	30 Minutes
Total Marks:	67
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Physics Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Physics Interview Question Answer

Physics Electrostatics Practice Test Online With Explanation

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Page 1 of 3

Physics

1. The electric field created by a positive charge is directed

Radially outward

Radially inward

Tangentially inward

Tangentially outward

2. Equal charges are given to two spheres of different radii. The potential will

Be equal on both the sphere

Be more on the bigger sphere

Depend on the nature of the material of the sphere

Be more on the smaller sphere

3. Two conductor having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

They have the same shape

They have the same capacity

They have the same amount of charge

They have the same potential

4. An alpha particle is accelerated through a potential difference of 10⁶ volt. Its kinetic energy will be

4 MeV

1 MeV

8 MeV

2 MeV

5. The unit of intensity of electric field is

Volt x meter

Joule/coulomb

Newton/coulomb

Newton/meter

6. An electric dipole is at the center of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

Q/4πr²

Q.d

2Q/4πr²

Zero

7. An electric force which folds the charges to make atoms and molecules

Positive charges

Negative charges

Neutral charges

A and B

8. Potential difference is the work done is moving unit positive charge form one point to another

In the direction of electric intensity

Against electric intensity

In the direction of electric flux

In any direction

9. The electric field lines exerting force on a charge are also known as

Force lines

Lines of force

Both A and B

Force of lines

10. In a charged capacitor the energy resides in

Magnetic field

Gravitational field

Electric field

Nuclear field

11. A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

Electric filed is normal to the surface of the cube

Electric potential at the surface of the cube is zero

Electric field varies within the cube

Electric potential within the cube is zero

12. A point charge Q is placed at the mid-point of a line joining two charges, 4q and q. If the net force on charge q is zero, then Q must be equal to

+4q

-q

-2q

13. Consider a spherical shell of metal at the center of which a positive point charge is kept

The electric field is zero everywhere

The electric field is zero outside the shell

The electric field is zero in the region inside the shell

The electric field is non-zero in both regions outside and inside the shell

14. Gaussian surface may be

Any shape

None of these

Rectangular

Spherical

15. Two similar charges of equal magnitude of one coulomb are placed in vacuum at what distance they will exert force of 9 x 10⁹ N?

100 meters

1 meters

0 meters

10 meters

16. If the distance of separation between two chares is increased, the electrical potential energy of the system will

Remain the same

Increase

Decrease

May increase or decrease

17. The value of the capacitance depends upon the

Thickness of the capacitor plates

Density of the capacitor plates

Voltage applied

Geometry of the capacitor

18. The test charge is always a unit

A and B

Negative charge

None of these

Positive charge

19. An electric field lines provides the information about

Medium

All of them

Electric force

Direction

20. The force between two charges in 8N. Now placed a mica of relativity 4 between two charges as a medium, the force then reduced to

6 N

4 N

2 N

8 N

21. The volt is equal to

N/m²

C/q

Joule/coulomb

Nm²/C

22. Force on a charged particle due to an electrostatic field is called:

Force of gravity

Electrostatic force

Magnetic force

Nuclear force

23. A point charge in space is attracted towards a dielectric material because of the

Phenomenon of dielectric polarization

Maximization of electrostatic flux

All of above

Dielectric hysteresis

24. The map of electric field lines provides the information of electric fields’

Strength

Position

Both A and B

Direction

25. The number of electrons in one coulomb charge is equal to

1.6 x 10¯²⁷

6.2 x 10²¹

1.6 x 10¹⁹

6.2 x 10¹⁸

Page 2 of 3

26. In a charged capacitor the energy is stored in the form of

Electric Field

Magnetic field

Gravitational Field

Nuclear Field

27. Two similar charges each of the coulomb placed in air one meter apart repel each other with a force

9 x 10⁹N

9 x 10⁷N

9.3 x 10⁹N

9.2 x 10⁴N

28. If mica sheet is placed between the plates of a capacitor the capacity

Decreases

Increases

Decreases then increases

Increases then decreases

29. Unit of electric flux density is

Coulomb/meter².

Weber / meter².

Coulomb.

Farad/meter.

30. The electric field is uniform

Near a positive point charge

Between two parallel oppositely charged plates.

Near a charged plate

Near a negative point charge

31. If an Area “A” is held perpendicular to the field lines of an electric field of intensity E, the flux through the area is

One

Zero

E/A

32. Capacitor is a device used for:

Producing charges

Storing current

Storing voltage

Storing electric charge

33. Xerography means

Type writing

Dry writing

None of these

Wet writing

34. Coulomb’s law for the force between electric charges most closely resembles with

Law of conservation of energy.

Newton’s law of gravitation.

Gauss’s theorem.

Newton’s law of motion.

35. Is the Gravitational force is conservation?

None of these

Yes

A little

36. If the distance between the two point charges become half then force between them becomes

Four times

Double

Remains same

Half

37. Equivalent capacitance is greater than individual capacitances is

Both series and parallel combinations

None of these

Parallel combination

Series combination

38. Electric field inside a hollow metallic charged sphere i

Increasing towards center

None of these

Zero

Decreasing towards center

39. Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permittivity Cr the force between the charges will

Depends upon composition of dielectric

Increase

Decreases

Remain constant

40. The relative permittivity for air at 1 atmospheric pressure is

1.0004

1.0002

1.0006

1.0008

41. Electric potential is a

Null vector

Vector quantity

Scalar Quantity

None

42. Capacitor is to have an energy content of 20J it must be placed across a potential difference of

9 volts

4 volts

2 volts

1 vol

43. The electric flux through the surface of a sphere of radius “r” due to a point charge q placed at its center depends upon:

The surface area of the sphere

The radius of the sphere

The quantity of charge inside of the sphere

The quantity of charge outside of the sphere

44. Electric flux linked with a surface will be maximum when

The surface is held perpendicular to the electric field

The surface is held parallel to the electric field

The surface makes an angle of 45? With the field

All of the above

45. The constant K in Coulomb’s Law depend upon

System of units

Nature of medium

A & B

Intensity of charge

46. A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the center of the sphere if its radius is 2 meters?

5μC m¯²

8μC m¯²

Zero

20μC m¯²

47. The Sl. Unit of an electric flux is

NmC¯¹

Nm²C¯²

NmC¯²

Nm²C¯¹

48. In an inkjet printer, the toner drops are

None of these

Charged and deflected

Charged

Not charged

49. If a closed surface contains two equal and opposite charges, the net electric flux from the surface is

Zero

Positive

Negative

None of these

50. Selenium is an insulating material when exposed to

None of these

Dark

Monochromatic light

Light

Page 3 of 3

51. The ratio of the capacitance of a parallel plate capacitor with an insulating substance as medium between the plates to its capacitance with vacuum (or air) as medium between them is the definition of

Dielectric

Relative permittivity

Capacitance

Dielectric constant

52. Electric charge of 100? C is 13cm apart from another charge 16.9? C electric force between them is

9 x 10⁵ N

900 N

9 x 10⁶ N

9 x 10⁷ N

53. Polarization of dielectric between the plates of a parallel plate capacitor ___________ the capacity of the capacitor.

Increases

Decreases

Neutralizes

Nullify

54. In a non-uniform electric field a polar molecule will experience

Both series and parallel combinations

Net force

Zero

Net torque

55. The direction of Electric intensity E is along the

Increasing potential

May be decreasing or increasing

None of these

Decreasing Potential

56. In the region of any positive point charge the other positive point charge feels

Opposite force

Repulsive force

Both A and B

Attractive force

57. Relative permittivity of air at one atm is __________ as compared to vacuum.

Zero

Greater

Equal

Lesser

58. Which of the following is the property of electrostatic field lines?

Electrostatic field lines always start on positive charge and end on negative charges

All Choices are

The number of lines that originate form, or terminate on a charge is proportional to the magnitude of the charge

The direction of the field at a point is along the tangent to the line of force

59. Why the toner is given a negative charge to the drum of printer?

To neutralize writing

To spread over the drum

None of these

To stick the writing

60. A capacitor is a perfect insulator for

Both for the direct and alternating current

None of these

Direct current

Alternating current

61. An electron of charge e coulomb passes through a potential difference of V volts. Its energy in ‘joules’ will be

V/e

e/V

62. At a point, the electric field intensity has

No value

Infinite values

Two values

One value

63. A test charge q is the charge which is

A point charge

Very small

Very long

All of these

64. Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become

1/4th of its original value

8 times of its original value

4 times of its original value

1/8th of its original value

65. Flux coming out from a unit positive charge placed in air is

4πε₀

ε₀¯¹

4(πε₀)¯¹

ε₀

66. The Earth’s potential is considered to be at

Maximum

Zero

Minimum

Infinite

67. The charges are attracted when

Two charges are alike

Two charges are opposite

None of these

A and B

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Mustansar KhanLast Updated: October 13, 2025

Physics Electrostatics Online Mcqs Test

Important Physics Electrostatics Question and Answer

Physics Electrostatics Practice Test Online With Explanation

Physics

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