# ELECTROSTATICS

Encircle the most appropriate answer from the following options :

1.      Study of charges at rest is called

(a) Electrostatics

(b) Magnetism

(c) Electrochemistry

(d) Electric Current

2.     An insulating rod is charged positively by rubbing. This is due to

(a) Deficiency of protons

(b) Excess of protons

(c) Deficiency of electrons

(d) Excess of electrons

3.       insulating rod is charged negatively, due to

(a) Deficiency of protons

(b) Excess of protons

(c) Deficiency of electrons

(d) Excess of electrons

4.      If we run a plastic comb through hair and then bring it near shell pieces of paper. The comb

(a) Attract them

(b) repel them

(c) Both a and b

(d) None of these

5.      Electric charges can be produced by rubbing a neutral body with

(a) Chärged body

(b) Another neutral body

(c) Both a and b

(d) None of these

6. SI unit of electric charge is

(a) Coulomb

(b) Ampere

(c) Volt

(d) Watt

7.      A positive charge

(a) Attract other positive

(b) Repel other positive charge

(c) Attract the natural charge

(d) Repels a neutral charge

8.     An object get excess charge when rubbed against another object

(a) Neutral

(b) Negative charged

(c) positively charge

(d) Object

9.      A body can be charged by

(a) Rubbing with another body

(b) Conduction

(c) Electrostatic induction

(d) All of these

10.     Only type charges exist

(a) One

(b) Two

(c) Three

(d) Four

I l.     If you rub the glass rod with a silk handkerchief,

(a) Glass rod acquires negative Charge while silk acquire positive charge

(b) Glass rod acquires positive Charge while silk acquire negative charge

(c) Both glass

(d) Both glass rod and silk acquire positive charge

12.     If you wipe the glass rod with a silk scarf, you will be charged for the following conditions:

(a) Heating

(b) Separation of change

(c) Rubbing

(d) electric force

13.     Which statement is correct?

(a) Similar charges attract each other

(b) Similar charges repel each other

(c) Similar charges attract and repel each other

(d) Similar charges either attract or repel one another

14.      Which statement is correct?

(a) Opposite charges attract each other

(b) Opposite charges repel each other

(c) Opposite charges attract and repel each other

(d) Opposite charges neither attract nor repel one another .

15.     Metals pre good conductors of electricity, because they have

(a) Large number of bonded electrons

(b) Small number of bonded electrons

(c) Large number of free electrons

(d) Small number of free electrons

16.      Free electrons are

(a) Tightly bound

(b) Fixed

(c) Loosely bound

(d) strongly fixed

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

(a) 6.25 x 1019

(b) 1.6 x 1019

(c) Zero

(d) 6.2 x 1021

18.      Like charges always

(a) Attract

(b) Repel

(c) Attract and repel

(d) None of these

19.       within the presence of a charged body an insulated inductor develops positive charge at one end and negative charges at other end, this process is named the

(a) Electrostatic induction

(b) Conduction

(c) Friction

(d) All of these

20.      Electroscope is an instrument used for

(a) Detecting presence of charge

(b) To detect the type of charges

(c) To identity conductor and insulator

(d) All of above

21.      Attraction or repulsion between them

(a) Two charged bodies

(b) Neutral body

(c) Non charged bodies

(d) All of these

22.      Who established the basic law of electric force between two stationary charged particles?

(a) planks

(c) Quantum

(d) Coulomb

23.     It is a fixed capacitor

(a) Paper capacitor

(b) Mica capacitor

(c) Both a and b

24.     In Mica capacitors the dielectric is

(a) Aluminum foils

(b) Mica

(c) Copper

(d) Polythene paper,

25,      Capacitors are used in

(a) Tuning Transmitters

(d) All of these

26.       In variable capacitors, the valve of capacitance can be

(a) Decrease

(b) Increased

(c) Both a and B

(d) Fixed

27.        A region around the charge in which it exerts electrostatic force on another charge is called

(a) Gravitational field

(b) Magnetic field

(c) Electric field

(d) All of these

28.       The equivalent capacitance is greater thin individual capacitance in

(a) Series combination

(b) Parallel combination

(c) Series and parallel combination

(d) All of them

29.        The spacing between the field lines shows the

(a) Strength of electric field

(b) Direction of electric field

(c) Both a and b

(d) None of these

30.        Electroscope can be charge by the process

(a) Magnetism

(b) Internal reflection

(c) Electrostatic induction

(d) Electromagnetic tension

31.     the worth of constant K depends upon

(a) The system of units used

(b) Medium between the charges

(c) Quantity of the charges

(d) The system of units and therefore the medium between the charges

32.     If the space between the 2 charged bodies is halved, then what will force between them becomes

(a) Doubled

(b) Half

(c) fourfold

(d) One half

33.    If the space between two charges is doubled, what is going to be electric force between them will become

(a) fourfold

(b) Twice

(c) Half

(d) One fourth

34.     In variable capacitors

(a) Both the sets, of plates are fixed

(b) Both the sets of plates are moveable

(c) One set of plates is fixed and therefore the other is moveable

(d) Both the sets of plates are neither fixed not moveable

35.       Variable capacitors are utilized in

(b) Television only

(d) None of the above

36.      When capacitors are connected serial , their equivalent capacitance is adequate to

(a) the product of their individual capacitances

(b) The sum of their individual capacitanCe

(c) The sum of the reciprocals of the individual capacitances

(d) the product of their individual reciprocal capacitances

37. The space round the charge within which other charges are influenced by it’s called

(a) electric intensity

(b) electric field

(c) Electric flux

(d) electric potential

38. Force experienced by a unit positive charge placed at some extent within the field is known as

(a) field intensity

(b) Mågnetic field strength

(c) potential

(d) capacity

39. The force per Unit Charge is understood a

(a) Electric flux

(b) Electric intensity

(c) electric potential

(d) Electric volt

40. SI unit of electrical field strength is

(a) Coulomb

(b) Volt

(c) Newton/coulomb

(d) Ampere

41. the electrical field intensity may be a vector quantity, and therefore the direction is

(a) Perpendicular to the direction of field

(b) Opposite to the direction of force

(c) Along the direction of force

(d) At a particular angle

42. With some extent charge, the electrical strength at an infinite distance is

(a) Zero

(b) Infinite

(c) Volt — m-1

(d) Positive

43. Work done in bringing unit charge from infinity thereto point is an electronic field is named

(a) potential difference

(b) Resistance

(c) Capacitance

(d) potential

44. electric field is robust when liens are

(a) Separated

(b) Closer

(c) Smaller

(d) Larger

45. at some extent in an electrical field is adequate to amount of work done in bringing unit positive charge from infinity thereto point

(a) Electric intensity

(b) electric potential

(c) electric potential

(d) Volt

46. statement is true about electrical potential

(a) Its Sl unit is volt

(b) it’s scalar quantity

(c) At any point v = w/q

(d) all of those

47. so as to store the charge a tool is used which is named

(a) Potential

(b) Capacitor

(c) Momentum

(d) voltage

48. SI unit of capacitance

(b) Coulomb

(c) Newton

(d) Voltage

49. Parallel plate capacitor contains two metal

(a) Metal

(b) Insulator

(c) conductor

(d) All of those

50. Which is wrong for a parallel capacitor?

(a) v1 = v2 = v3 = v

(b) Q = Q1 + Q2 + Q3

(c) Ce = C1 + C2 + C3

(d) Q = Q1 = Q2 = Q3

51. The work done in moving the eclectic field may be a measure of

(a) Intensity of electrical field

(b) Resistance between two points

(c) Capacitance

(d) electric potential between two points

52. The potential difference between two points is one volt. the quantity of work done in moving a charge of 1 coulomb from one point to a different is

(a) One erg

(b) One Joule

(c) One eV

(d) One coulomb

53. electron volt is that the unit of

(a) electric potential

(b) electric energy

(c) electric current

(d) Capacitance

54. The electron energy is one electron — volt when it’s accelerated through a possible difference of

(a) One walt

(b) One joule

(c) One Coulomb

(d) One erg

55. electric potential may be a

(a) Vector quantity

(b) Scalar quantity

(c) Neither scalar nor vector

(d) Sometimes scalar and sometimes vector\