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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. Xerography means

None of these

Wet writing

Type writing

Dry writing

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

4 MeV

8 MeV

1 MeV

2 MeV

3. 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

4. An electric field lines provides the information about

All of them

Direction

Electric force

Medium

5. 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

Remain constant

Depends upon composition of dielectric

Decreases

Increase

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

Zero

One

E/A

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

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

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

All Choices are

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

8. At a point, the electric field intensity has

No value

Infinite values

Two values

One value

9. 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

Dielectric constant

Relative permittivity

10. The Sl. Unit of an electric flux is

Nm²C¯¹

Nm²C¯²

NmC¯¹

NmC¯²

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

Force of gravity

Electrostatic force

Nuclear force

Magnetic force

12. A test charge q is the charge which is

All of these

Very long

A point charge

Very small

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

Both A and B

Strength

Direction

Position

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

Against electric intensity

In any direction

In the direction of electric intensity

In the direction of electric flux

15. 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 everywhere

The electric field is zero in the region inside the shell

The electric field is zero outside the shell

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

Net torque

Zero

Net force

Both series and parallel combinations

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

1.0002

1.0004

1.0008

1.0006

18. The charges are attracted when

Two charges are alike

A and B

None of these

Two charges are opposite

19. The direction of Electric intensity E is along the

May be decreasing or increasing

Increasing potential

Decreasing Potential

None of these

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

8 N

2 N

4 N

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

Attractive force

Opposite force

Repulsive force

Both A and B

22. 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)

Zero

2Q/4πr²

Q.d

Q/4πr²

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

Negative charges

Positive charges

Neutral charges

A and B

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

V/e

e/V

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

4πε₀

ε₀¯¹

ε₀

4(πε₀)¯¹

Page 2 of 3

26. Equivalent capacitance is greater than individual capacitances is

None of these

Both series and parallel combinations

Parallel combination

Series combination

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

Infinite

Minimum

Maximum

Zero

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

Radially outward

Tangentially inward

Tangentially outward

Radially inward

29. 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 quantity of charge outside of the sphere

The quantity of charge inside of the sphere

The surface area of the sphere

The radius of the sphere

30. Electric field inside a hollow metallic charged sphere i

None of these

Increasing towards center

Zero

Decreasing towards center

31. 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

-2q

-q

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

Zero

None of these

Negative

Positive

33. Electric potential is a

Vector quantity

Null vector

None

Scalar Quantity

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

Double

Four times

Remains same

Half

35. The electric field is uniform

Near a negative point charge

Near a charged plate

Near a positive point charge

Between two parallel oppositely charged plates.

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

Nuclear Field

Electric Field

Magnetic field

Gravitational Field

37. A capacitor is a perfect insulator for

Both for the direct and alternating current

None of these

Alternating current

Direct current

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

Be more on the smaller sphere

Depend on the nature of the material of the sphere

Be equal on both the sphere

Be more on the bigger sphere

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

9 volts

2 volts

4 volts

1 vol

40. Capacitor is a device used for:

Storing electric charge

Storing voltage

Producing charges

Storing current

41. Unit of electric flux density is

Weber / meter².

Coulomb/meter².

Coulomb.

Farad/meter.

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

Law of conservation of energy.

Gauss’s theorem.

Newton’s law of gravitation.

Newton’s law of motion.

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

The surface is held parallel to the electric field

All of the above

The surface makes an angle of 45? With the field

The surface is held perpendicular to the electric field

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

Increases then decreases

Increases

Decreases then increases

Decreases

45. Is the Gravitational force is conservation?

A little

Yes

None of these

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

9 x 10⁷N

9 x 10⁹N

9.3 x 10⁹N

9.2 x 10⁴N

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

Decreases

Neutralizes

Nullify

Increases

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

Remain the same

May increase or decrease

Increase

Decrease

49. 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

4 times of its original value

8 times of its original value

1/8th of its original value

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

All of above

Phenomenon of dielectric polarization

Maximization of electrostatic flux

Dielectric hysteresis

Page 3 of 3

51. 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 potential

They have the same shape

They have the same capacity

They have the same amount of charge

52. 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?

Zero

5μC m¯²

8μC m¯²

20μC m¯²

53. Selenium is an insulating material when exposed to

None of these

Dark

Monochromatic light

Light

54. In an inkjet printer, the toner drops are

Charged

None of these

Not charged

Charged and deflected

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

A & B

Intensity of charge

Nature of medium

System of units

56. 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 field varies within the cube

Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

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

1.6 x 10¯²⁷

1.6 x 10¹⁹

6.2 x 10²¹

6.2 x 10¹⁸

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

Lesser

Greater

Equal

Zero

59. The volt is equal to

Nm²/C

Joule/coulomb

C/q

N/m²

60. 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

0 meters

10 meters

1 meters

61. The value of the capacitance depends upon the

Thickness of the capacitor plates

Voltage applied

Geometry of the capacitor

Density of the capacitor plates

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

9 x 10⁷ N

900 N

9 x 10⁵ N

9 x 10⁶ N

63. The test charge is always a unit

None of these

A and B

Positive charge

Negative charge

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

Force of lines

Lines of force

Both A and B

Force lines

65. In a charged capacitor the energy resides in

Nuclear field

Electric field

Gravitational field

Magnetic field

66. Gaussian surface may be

Spherical

Any shape

None of these

Rectangular

67. The unit of intensity of electric field is

Newton/coulomb

Joule/coulomb

Volt x meter

Newton/meter

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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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