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ECAT Physics Electrostatics Test Online

Mustansar KhanLast Updated: April 18, 2025

Physics Electrostatics MCQS Online Test

ECAT Physics Electrostatics Chapter Online Test

Total Questions:	67
Time Allowed:	30 Minutes
Total Marks:	67
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Physics Electrostatics Chapter Test Online

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Page 1 of 3

Physics

1. Electric potential is a

None

Null vector

Vector quantity

Scalar Quantity

2. 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?

8μC m¯²

20μC m¯²

5μC m¯²

Zero

3. The electric field is uniform

Near a charged plate

Near a negative point charge

Near a positive point charge

Between two parallel oppositely charged plates.

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

Decreases then increases

Decreases

Increases

Increases then decreases

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

Intensity of charge

System of units

Nature of medium

A & B

6. Gaussian surface may be

Any shape

Spherical

None of these

Rectangular

7. 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 quantity of charge outside of the sphere

The radius of the sphere

The quantity of charge inside of the sphere

8. The Sl. Unit of an electric flux is

Nm²C¯¹

Nm²C¯²

NmC¯²

NmC¯¹

9. A test charge q is the charge which is

A point charge

All of these

Very long

Very small

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

Neutral charges

Negative charges

Positive charges

A and B

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

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

The electric field is zero outside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

12. The charges are attracted when

None of these

Two charges are opposite

Two charges are alike

A and B

13. An electric field lines provides the information about

All of them

Medium

Direction

Electric force

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

None of these

To neutralize writing

To spread over the drum

To stick the writing

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

Against electric intensity

In the direction of electric intensity

In any direction

In the direction of electric flux

16. Electric field inside a hollow metallic charged sphere i

Increasing towards center

Zero

Decreasing towards center

None of these

17. The unit of intensity of electric field is

Newton/coulomb

Joule/coulomb

Newton/meter

Volt x meter

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

Electric potential at the surface of the cube is zero

Electric field varies within the cube

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

19. In a charged capacitor the energy resides in

Magnetic field

Nuclear field

Electric field

Gravitational field

20. 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

-q

-2q

+4q

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

Nuclear force

Force of gravity

Electrostatic force

Magnetic force

22. A capacitor is a perfect insulator for

Alternating current

None of these

Both for the direct and alternating current

Direct current

23. Xerography means

Type writing

None of these

Dry writing

Wet writing

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

E/A

One

Zero

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

e/V

V/e

Page 2 of 3

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

Neutralizes

Increases

Nullify

Decreases

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

Net torque

Zero

Net force

Both series and parallel combinations

28. Equivalent capacitance is greater than individual capacitances is

Parallel combination

Both series and parallel combinations

None of these

Series combination

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

Newton’s law of gravitation.

Newton’s law of motion.

Gauss’s theorem.

Law of conservation of energy.

30. 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

Decreases

Remain constant

Depends upon composition of dielectric

Increase

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

1.0004

1.0002

1.0006

1.0008

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

Remain the same

Decrease

May increase or decrease

Increase

33. The direction of Electric intensity E is along the

May be decreasing or increasing

None of these

Increasing potential

Decreasing Potential

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

9.3 x 10⁹N

9 x 10⁷N

9 x 10⁹N

9.2 x 10⁴N

35. The value of the capacitance depends upon the

Thickness of the capacitor plates

Geometry of the capacitor

Density of the capacitor plates

Voltage applied

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

Zero

Greater

Lesser

Equal

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

Remains same

Four times

Half

Double

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

2 volts

4 volts

9 volts

1 vol

39. 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?

0 meters

100 meters

1 meters

10 meters

40. 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)

2Q/4πr²

Q/4πr²

Q.d

Zero

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

Gravitational Field

Nuclear Field

Magnetic field

Electric Field

42. In an inkjet printer, the toner drops are

Charged

None of these

Charged and deflected

Not charged

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

Be more on the smaller sphere

Be equal on both the sphere

Be more on the bigger sphere

Depend on the nature of the material of the sphere

44. Capacitor is a device used for:

Producing charges

Storing current

Storing electric charge

Storing voltage

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

Force lines

Force of lines

Both A and B

Lines of force

46. Unit of electric flux density is

Coulomb.

Weber / meter².

Coulomb/meter².

Farad/meter.

47. 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 amount of charge

They have the same capacity

They have the same potential

48. Is the Gravitational force is conservation?

Yes

None of these

A little

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

Infinite

Zero

Minimum

Maximum

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

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

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

Page 3 of 3

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

900 N

9 x 10⁷ N

9 x 10⁵ N

9 x 10⁶ N

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

The surface makes an angle of 45? With the field

All of the above

The surface is held parallel to the electric field

The surface is held perpendicular to the electric field

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

Tangentially inward

Radially inward

Radially outward

Tangentially outward

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

Negative

Positive

Zero

None of these

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

4 times of its original value

1/8th of its original value

1/4th of its original value

8 times of its original value

56. 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

8 N

4 N

2 N

6 N

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

1.6 x 10¯²⁷

6.2 x 10¹⁸

6.2 x 10²¹

1.6 x 10¹⁹

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

Opposite force

Attractive force

Both A and B

Repulsive force

59. Selenium is an insulating material when exposed to

None of these

Light

Monochromatic light

Dark

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

Position

Both A and B

Direction

Strength

61. The volt is equal to

C/q

Joule/coulomb

N/m²

Nm²/C

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

8 MeV

4 MeV

2 MeV

1 MeV

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

Maximization of electrostatic flux

Dielectric hysteresis

All of above

Phenomenon of dielectric polarization

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

4πε₀

4(πε₀)¯¹

ε₀¯¹

ε₀

65. At a point, the electric field intensity has

Infinite values

One value

Two values

No value

66. The test charge is always a unit

Negative charge

None of these

A and B

Positive charge

67. 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

Capacitance

Dielectric

Relative permittivity

Dielectric constant

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Mustansar KhanLast Updated: April 18, 2025

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ECAT Physics Electrostatics Test Online

Physics Electrostatics MCQS Online Test

ECAT Physics Electrostatics Chapter Online Test

Physics Electrostatics Chapter Test Online

Physics

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Physics Electrostatics MCQS Online Test

ECAT Physics Electrostatics Chapter Online Test

Physics Electrostatics Chapter Test Online

Physics

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