Physics Electrostatics Online Mcqs Test

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Question 1

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

Answer

4(πε₀)¯¹

Question 2

2. Gaussian surface may be

Answer

Rectangular

Answer

None of these

Question 3

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

Question 4

4. 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?

Answer

8μC m¯²

Answer

20μC m¯²

Answer

5μC m¯²

Question 5

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

Answer

Remains same

Answer

Four times

Question 6

6. In an inkjet printer, the toner drops are

Answer

Not charged

Answer

Charged and deflected

Answer

None of these

Question 7

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

Answer

All of the above

Answer

The surface is held parallel to the electric field

Answer

The surface makes an angle of 45? With the field

Answer

The surface is held perpendicular to the electric field

Question 8

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

Answer

Electric potential within the cube is zero

Answer

Electric filed is normal to the surface of the cube

Answer

Electric potential at the surface of the cube is zero

Answer

Electric field varies within the cube

Question 9

9. In a charged capacitor the energy resides in

Answer

Nuclear field

Answer

Gravitational field

Answer

Electric field

Answer

Magnetic field

Question 10

10. 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

Answer

Dielectric constant

Answer

Dielectric

Answer

Relative permittivity

Answer

Capacitance

Question 11

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

Answer

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

Answer

All Choices are

Answer

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

Answer

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

Question 12

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

Answer

Both A and B

Question 13

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

Question 14

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

Answer

Remain the same

Answer

May increase or decrease

Question 15

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

Answer

The surface area of the sphere

Answer

The quantity of charge inside of the sphere

Answer

The quantity of charge outside of the sphere

Answer

The radius of the sphere

Question 16

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

Question 17

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

Answer

1.6 x 10¹⁹

Answer

6.2 x 10¹⁸

Answer

1.6 x 10¯²⁷

Answer

6.2 x 10²¹

Question 18

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

Question 19

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

Answer

Maximization of electrostatic flux

Answer

All of above

Answer

Phenomenon of dielectric polarization

Answer

Dielectric hysteresis

Question 20

20. The value of the capacitance depends upon the

Answer

Thickness of the capacitor plates

Answer

Voltage applied

Answer

Density of the capacitor plates

Answer

Geometry of the capacitor

Question 21

21. 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?

Answer

100 meters

Question 22

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

Answer

9 x 10⁶ N

Answer

9 x 10⁷ N

Answer

9 x 10⁵ N

Question 23

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

Answer

Force of lines

Answer

Both A and B

Answer

Force lines

Answer

Lines of force

Question 24

24. 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

Answer

They have the same potential

Answer

They have the same amount of charge

Answer

They have the same shape

Answer

They have the same capacity

Question 25

25. 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

Question 26

26. Xerography means

Answer

None of these

Answer

Wet writing

Answer

Type writing

Answer

Dry writing

Question 27

27. The unit of intensity of electric field is

Answer

Newton/meter

Answer

Joule/coulomb

Answer

Newton/coulomb

Answer

Volt x meter

Question 28

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

Answer

4 times of its original value

Answer

8 times of its original value

Answer

1/4th of its original value

Answer

1/8th of its original value

Question 29

29. The charges are attracted when

Answer

None of these

Answer

Two charges are opposite

Answer

Two charges are alike

Question 30

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

Answer

The electric field is zero in the region inside the shell

Answer

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

Answer

The electric field is zero everywhere

Answer

The electric field is zero outside the shell

Question 31

31. The direction of Electric intensity E is along the

Answer

None of these

Answer

Increasing potential

Answer

Decreasing Potential

Answer

May be decreasing or increasing

Question 32

32. Equivalent capacitance is greater than individual capacitances is

Answer

None of these

Answer

Series combination

Answer

Both series and parallel combinations

Answer

Parallel combination

Question 33

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

Answer

Both series and parallel combinations

Answer

Net torque

Question 34

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

Answer

To spread over the drum

Answer

To neutralize writing

Answer

None of these

Answer

To stick the writing

Question 35

35. An electric field lines provides the information about

Answer

All of them

Answer

Electric force

Question 36

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

Answer

System of units

Answer

Nature of medium

Answer

Intensity of charge

Question 37

37. Electric potential is a

Answer

Null vector

Answer

Vector quantity

Answer

Scalar Quantity

Question 38

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

Answer

Neutral charges

Answer

Negative charges

Answer

Positive charges

Question 39

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

Answer

Both A and B

Answer

Repulsive force

Answer

Opposite force

Answer

Attractive force

Question 40

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

Answer

In any direction

Answer

Against electric intensity

Answer

In the direction of electric flux

Answer

In the direction of electric intensity

Question 41

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

Answer

Force of gravity

Answer

Electrostatic force

Answer

Magnetic force

Answer

Nuclear force

Question 42

42. A test charge q is the charge which is

Answer

All of these

Answer

A point charge

Answer

Very small

Question 43

43. 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)

Question 44

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

Answer

9.2 x 10⁴N

Answer

9 x 10⁷N

Answer

9.3 x 10⁹N

Answer

9 x 10⁹N

Question 45

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

Answer

Be more on the bigger sphere

Answer

Be more on the smaller sphere

Answer

Be equal on both the sphere

Answer

Depend on the nature of the material of the sphere

Question 46

46. Selenium is an insulating material when exposed to

Answer

None of these

Answer

Monochromatic light

Question 47

47. A capacitor is a perfect insulator for

Answer

Both for the direct and alternating current

Answer

None of these

Answer

Direct current

Answer

Alternating current

Question 48

48. The volt is equal to

Answer

Joule/coulomb

Question 49

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

Question 50

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

Answer

Neutralizes

Question 51

51. Unit of electric flux density is

Answer

Weber / meter².

Answer

Coulomb/meter².

Answer

Farad/meter.

Question 52

52. 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

Question 53

53. The Sl. Unit of an electric flux is

Question 54

54. Is the Gravitational force is conservation?

Answer

None of these

Question 55

55. The test charge is always a unit

Answer

Positive charge

Answer

Negative charge

Answer

None of these

Question 56

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

Answer

Decreases then increases

Answer

Increases then decreases

Question 57

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

Question 58

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

Answer

Electric Field

Answer

Gravitational Field

Answer

Magnetic field

Answer

Nuclear Field

Question 59

59. Capacitor is a device used for:

Answer

Storing voltage

Answer

Storing electric charge

Answer

Storing current

Answer

Producing charges

Question 60

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

Answer

Radially inward

Answer

Radially outward

Answer

Tangentially outward

Answer

Tangentially inward

Question 61

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

Answer

Law of conservation of energy.

Answer

Newton’s law of motion.

Answer

Gauss’s theorem.

Answer

Newton’s law of gravitation.

Question 62

62. Electric field inside a hollow metallic charged sphere i

Answer

Increasing towards center

Answer

None of these

Answer

Decreasing towards center

Question 63

63. 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

Answer

Depends upon composition of dielectric

Answer

Remain constant

Question 64

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

Answer 168

Two values

Answer 169

Infinite values

Answer 170

Near a negative point charge

Answer 171

Between two parallel oppositely charged plates.

Answer 172

Near a positive point charge

Answer 173

Near a charged plate

Answer 174

None of these

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 Online Mcqs Test

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Important Physics Electrostatics Question and Answer

Physics Electrostatics Practice Test Online With Explanation

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How to Score High in Physics Electrostatics Online Mcqs Test?

Key Preparation Tips:

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