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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 flux linked with a surface will be maximum when

The surface is held parallel to the electric field

The surface is held perpendicular to the electric field

The surface makes an angle of 45? With the field

All of the above

2. 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

1/8th of its original value

4 times of its original value

8 times of its original value

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

1.0006

1.0002

1.0004

1.0008

4. The direction of Electric intensity E is along the

Increasing potential

Decreasing Potential

May be decreasing or increasing

None of these

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

Both A and B

Attractive force

Repulsive force

Opposite force

6. Electric potential is a

Vector quantity

Scalar Quantity

Null vector

None

7. An electric field lines provides the information about

Direction

Electric force

Medium

All of them

8. Is the Gravitational force is conservation?

Yes

A little

None of these

9. Capacitor is a device used for:

Storing current

Producing charges

Storing electric charge

Storing voltage

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

All Choices are

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

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

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

1 MeV

8 MeV

4 MeV

2 MeV

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

Increases then decreases

Decreases then increases

Decreases

Increases

13. At a point, the electric field intensity has

Infinite values

Two values

No value

One value

14. Equivalent capacitance is greater than individual capacitances is

Parallel combination

Series combination

Both series and parallel combinations

None of these

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

Nuclear force

Force of gravity

Electrostatic force

Magnetic force

16. Xerography means

Type writing

Wet writing

None of these

Dry writing

17. Gaussian surface may be

Spherical

Rectangular

None of these

Any shape

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

May increase or decrease

Increase

Remain the same

Decrease

19. A test charge q is the charge which is

A point charge

Very small

All of these

Very long

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

ε₀¯¹

ε₀

4πε₀

4(πε₀)¯¹

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

9 x 10⁷ N

9 x 10⁶ N

900 N

9 x 10⁵ N

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

Zero

Positive

Negative

None of these

23. 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

Zero

Q.d

Q/4πr²

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

To spread over the drum

To neutralize writing

None of these

To stick the writing

25. The test charge is always a unit

A and B

Positive charge

Negative charge

None of these

Page 2 of 3

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

A and B

Negative charges

Positive charges

Neutral charges

27. The charges are attracted when

Two charges are opposite

Two charges are alike

None of these

A and B

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

e/V

V/e

29. Electric field inside a hollow metallic charged sphere i

Increasing towards center

None of these

Zero

Decreasing towards center

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

Lesser

Zero

Greater

Equal

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

Lines of force

Force of lines

Force lines

Both A and B

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

Law of conservation of energy.

Newton’s law of motion.

Gauss’s theorem.

Newton’s law of gravitation.

33. In an inkjet printer, the toner drops are

Charged and deflected

Not charged

Charged

None of these

34. A capacitor is a perfect insulator for

Direct current

Both for the direct and alternating current

None of these

Alternating current

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

Be more on the bigger sphere

Be equal on both the sphere

Depend on the nature of the material of the sphere

Be more on the smaller sphere

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

2 volts

4 volts

1 vol

9 volts

37. 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

Dielectric constant

Relative permittivity

Capacitance

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

Electric Field

Magnetic field

Nuclear Field

Gravitational Field

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?

10 meters

100 meters

0 meters

1 meters

40. 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

E/A

One

41. 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 amount of charge

They have the same capacity

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

Tangentially outward

Tangentially inward

Radially inward

Radially outward

43. 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 in the region inside the shell

The electric field is zero outside the shell

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

44. The unit of intensity of electric field is

Newton/coulomb

Newton/meter

Joule/coulomb

Volt x meter

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

Dielectric hysteresis

All of above

Phenomenon of dielectric polarization

Maximization of electrostatic flux

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

Double

Half

Remains same

Four times

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

Electric potential within the cube is zero

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

48. The volt is equal to

N/m²

Nm²/C

Joule/coulomb

C/q

49. 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

2 N

6 N

8 N

50. Unit of electric flux density is

Coulomb.

Weber / meter².

Coulomb/meter².

Farad/meter.

Page 3 of 3

51. The electric field is uniform

Near a negative point charge

Near a positive point charge

Between two parallel oppositely charged plates.

Near a charged plate

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

Net torque

Both series and parallel combinations

Net force

Zero

53. The value of the capacitance depends upon the

Density of the capacitor plates

Thickness of the capacitor plates

Geometry of the capacitor

Voltage applied

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

1.6 x 10¹⁹

6.2 x 10²¹

1.6 x 10¯²⁷

6.2 x 10¹⁸

55. Selenium is an insulating material when exposed to

None of these

Light

Dark

Monochromatic light

56. In a charged capacitor the energy resides in

Magnetic field

Electric field

Gravitational field

Nuclear field

57. 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

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

Minimum

Zero

Infinite

Maximum

59. 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

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

Position

Both A and B

Strength

Direction

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

Decreases

Nullify

Neutralizes

Increases

62. 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 inside of the sphere

The surface area of the sphere

The radius of the sphere

The quantity of charge outside of the sphere

63. 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

9.2 x 10⁴N

9.3 x 10⁹N

64. 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

Decreases

Remain constant

Increase

65. 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?

20μC m¯²

Zero

5μC m¯²

8μC m¯²

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

System of units

Nature of medium

Intensity of charge

A & B

67. The Sl. Unit of an electric flux is

Nm²C¯²

NmC¯¹

NmC¯²

Nm²C¯¹

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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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Mustansar Khan

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