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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. 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 radius of the sphere

The quantity of charge outside of the sphere

The surface area of the sphere

The quantity of charge inside of the sphere

2. The unit of intensity of electric field is

Newton/meter

Volt x meter

Joule/coulomb

Newton/coulomb

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

1 MeV

4 MeV

8 MeV

2 MeV

4. 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 capacity

They have the same amount of charge

They have the same shape

They have the same potential

5. 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

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

9 volts

2 volts

1 vol

4 volts

7. In an inkjet printer, the toner drops are

Charged and deflected

Charged

None of these

Not charged

8. The charges are attracted when

None of these

A and B

Two charges are opposite

Two charges are alike

9. 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

4 N

6 N

2 N

8 N

10. A capacitor is a perfect insulator for

Both for the direct and alternating current

None of these

Alternating current

Direct current

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

Tangentially inward

Radially outward

Tangentially outward

Radially inward

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

Zero

Negative

Positive

None of these

13. 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 constant

Dielectric

Capacitance

Relative permittivity

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

Force lines

Both A and B

Lines of force

Force of lines

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

Force of gravity

Electrostatic force

Nuclear force

Magnetic force

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

6.2 x 10²¹

6.2 x 10¹⁸

1.6 x 10¹⁹

1.6 x 10¯²⁷

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

Be equal on both the sphere

Depend on the nature of the material of the sphere

Be more on the smaller sphere

Be more on the bigger sphere

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

9 x 10⁹N

9.3 x 10⁹N

9.2 x 10⁴N

9 x 10⁷N

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

ε₀¯¹

ε₀

4πε₀

4(πε₀)¯¹

20. At a point, the electric field intensity has

One value

Two values

Infinite values

No value

21. A test charge q is the charge which is

A point charge

Very long

Very small

All of these

22. Gaussian surface may be

Any shape

Rectangular

None of these

Spherical

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

Maximization of electrostatic flux

All of above

Phenomenon of dielectric polarization

Dielectric hysteresis

24. The volt is equal to

Joule/coulomb

C/q

Nm²/C

N/m²

25. 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

Remain constant

Decreases

Page 2 of 3

26. The test charge is always a unit

Negative charge

None of these

A and B

Positive charge

27. Is the Gravitational force is conservation?

Yes

A little

None of these

28. 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

8 times of its original value

1/4th of its original value

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

9 x 10⁶ N

9 x 10⁵ N

9 x 10⁷ N

900 N

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

Direction

Position

Strength

Both A and B

31. 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 in the region inside the shell

The electric field is zero everywhere

32. 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

20μC m¯²

8μC m¯²

5μC m¯²

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

None of these

To spread over the drum

To stick the writing

To neutralize writing

34. 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

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

Greater

Lesser

Zero

Equal

36. 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

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

System of units

Nature of medium

A & B

Intensity of charge

38. Equivalent capacitance is greater than individual capacitances is

None of these

Parallel combination

Series combination

Both series and parallel combinations

39. The value of the capacitance depends upon the

Geometry of the capacitor

Density of the capacitor plates

Thickness of the capacitor plates

Voltage applied

40. In a charged capacitor the energy resides in

Gravitational field

Magnetic field

Electric field

Nuclear field

41. Xerography means

Type writing

Dry writing

Wet writing

None of these

42. The Sl. Unit of an electric flux is

NmC¯¹

NmC¯²

Nm²C¯²

Nm²C¯¹

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

A and B

Positive charges

Negative charges

Neutral charges

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

Gauss’s theorem.

Newton’s law of gravitation.

Newton’s law of motion.

Law of conservation of energy.

45. Selenium is an insulating material when exposed to

Monochromatic light

None of these

Light

Dark

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

Minimum

Maximum

Infinite

Zero

47. An electric field lines provides the information about

Electric force

Direction

All of them

Medium

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

Increases

Increases then decreases

Decreases then increases

Decreases

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

V/e

e/V

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

1.0008

1.0004

1.0006

1.0002

Page 3 of 3

51. 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

52. 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

-2q

+4q

-q

53. 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

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

All Choices are

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

54. Unit of electric flux density is

Coulomb.

Weber / meter².

Coulomb/meter².

Farad/meter.

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

Net force

Net torque

Zero

Both series and parallel combinations

56. 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

Zero

2Q/4πr²

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

Opposite force

Repulsive force

Both A and B

Attractive force

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

Nullify

Decreases

Increases

Neutralizes

59. The direction of Electric intensity E is along the

Decreasing Potential

None of these

May be decreasing or increasing

Increasing potential

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

The surface is held perpendicular to the electric field

The surface makes an angle of 45? With the field

The surface is held parallel to the electric field

All of the above

61. The electric field is uniform

Near a positive point charge

Near a negative point charge

Between two parallel oppositely charged plates.

Near a charged plate

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

Decrease

May increase or decrease

Increase

Remain the same

63. Capacitor is a device used for:

Storing current

Producing charges

Storing voltage

Storing electric charge

64. Electric potential is a

Null vector

Scalar Quantity

None

Vector quantity

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

Magnetic field

Electric Field

Nuclear Field

Gravitational Field

66. Electric field inside a hollow metallic charged sphere i

Zero

Increasing towards center

None of these

Decreasing towards center

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

Remains same

Four times

Half

Double

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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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