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CHAPTER 12
ELECTROSTATICS
Encircle the most appropriate answer among the following options
1. The Coulomb force is choose which one is correct:
(a) F =
(b) F =
(c) F =
(d) F =
2. The value of K depends upon choose which one is correct:
(a) Charges
(b) System of units and medium
(c) The distance between charges
(d) Nature of medium
3. The value of K in SI system of units choose which one is correct:
(a) 9 x 109 Nm2/c2
(b) 9 x 1010Nm2/c2
(c) 9 x 10-9 Nm2/c2
(d) 9 x 109 NC/m2
4. The branch of physics which deals with the charges at rest choose which one is correct:
(a) Current electricity
(b) Electromagnetism
(c) Electrostatics
(d) Nuclear physics
5. The value of permitivity of free space choose which one is correct:
(a) 8.85 x 10-12 C2/Nm2
(b) 8.85 x 10-12 C 2 m 2/N
(c) 8.85 x 10 12 Nm2/C
(d) 8.85 x 10-11 Nm2/C2
6. When the medium is insulator the electrostatic force between the charges is choose which one is correct:
(a) Decreased
(b) Zero
(c) Increased
(d) None of above
7. What is standard to measure the relative permittivity choose which one is correct:
(a) Water
(b) Vacuum
(c) Air
(d) Atmosphere
8. Which of the following statement is correct choose which one is correct:
(a) Similar charges attract each other
(b) Similar charges attract and repel each other
(c) Similar charges repel each other
(d) Similar charges neither attract nor repel
9. Metals are good conductors of electricity because they have properties among the following choose which one is correct:
(a) Large number of bounded electrons
(b) Small number of electrons
(c) Large number of free electrons
(d) Small number of free electrons
10. Free electrons are choose which one is correct:
(a) Fixed
(b) Loosely bounded
(c) Strongly fixed
(d) Tightly bound
11. The SI unit of charge is choose which one is correct:
(a) Coulomb
(b) Calorie
(c) Ampere
(d) Joule
12. The number of electrons in one coulomb charge is equal to choose which one is correct:
(a) 6.2 x 10 18 electrons
(b) Zero electrons
(c) 1.6 x 10-22 electrons
(d) 6.2 x 1021 electrons
13. What will be the electrostatic force of repulsion between two electrons at I metre choose which one is correct:
(a) 9 x 109 N
(b) 1.44x 10-9 N
(c) 2.30 x 10-28 N
(d) 1 N
14. A charge of 10and 14.4 are 12 cm apart, the force between them is choose which one is correct:
(a) 9 x 105 N
(b) 9 x 107 N
(c) 90 N
(d) 108x 107 N
15. A substance contains choose which one is correct:
(a) Only positive charge
(b) Only negative charge
(c) Both +ve and —ve charge
(d) None of above
16. If the distance between the two charge bodies is halved, the force between them becomes choose which one is correct:
(a) Half
(b) Four time
(c) One fourth
(d) Doubled
17. The SI units of permitivity are choose which one is correct:
(a) N.m/C2
(b) C2/N.m2
(c) N.m2/C2
(d) N.m/C
18. The minimum charge on any electron be less than choose which one is correct:
(a) 1.6 x 10-19C
(b) 3.2 x 10-19C
(c) 1.8 x 10-19
(d) 9.1 x 10.-19
19. The charges on the parallel plates of capacitor possess choose which one is correct:
(a) K.E
(b) Chemical energy
(c) Electric potential energy
(d) None of above
20. When current of one ampere is flowing across any cross-section of wire in one second, then the quantity of charge is said to be choose which one is correct:
(a) One coulomb
(b) Three coulomb
(c) One micro-coulomb
(d) None of above
21. The electric force between two charges placed in air is 2 Newton. When placed in a medium of r = 80, the force will be reduced to choose which one is correct:
(a) 0.029 N
(b) 0.025 N
(c) 0.03 N
(d) 0.04 N
22. The value of r for various dielectrics will always choose which one is correct:
(a) Larger than unity
(b) Less than unity
(c) Equal to unity
(d) None of above
23. A metallic hallow sphere of 8cm diameter is charged with 4 x 10 c. What will be the potential on its surface will be choose which one is correct:
(a) 90 volts
(b) 9 volts
(c) 9000 volts
(d) 900 volts
24. Origin of the gravitational and electric forces choose which one is correct:
(a) is still unknown
(b) was known in 1611 A.D
(c) was known in 1712 A.D
(d) was known in 1911 A.D
25. Michael Faraday was known by his work on choose which one is correct:
(a) Electric force
(b) Weak nuclear force
(c) Strong nuclear force
(d) Gravitational force
26. The SI unit of charge is choose which one is correct:
(a) Meter
(b) Ampere
(c) Coulomb
(d) volt
27. In case of two identical charges placed at certain distance, the electric lines of force are choose which one is correct:
(a) Curved
(b) Straight lines
(c) Both (a) and (b)
(d) None of these
28. An example of photoconductor is choose which one is correct:
(a) Iron
(b) Aluminum
(c) Carbon
(d) Selenium
29. Selenium is choose which one is correct:
(a) Conductor
(b) Insulator in the dark are becomes conductor when exposed to light
(c) An insulator
(d) None of these
30. The inkjet printer ejects a thin stream of choose which one is correct:
(a) Ink
(b) Water
(c) Oil
(d) None of these
31. An important part of inkjet printer is choose which one is correct:
(a) Deflection plates
(b) Toner
(c) Drum
(d) None of these
32. An inkjet printer uses in its operation choose which one is correct:
(a) Positrons
(b) Neutrons
(c) An electric charge
(d) Photons
33. The photo copying process is called choose which one is correct:
(a) Xerography
(b) Inkjet printer
(c) Both (a) and (b)
(d) None of these
34. An important port of a photocopier is choose which one is correct:
(a) Deflation plates
(b) Toner
(c) Charging electrode
(d) Printed head
35. Xerography means choose which one is correct:
(a) Dry writing
(b) Wet writing
(c) Both (a) and (b)
(d) None of these
36. The number of electric field lines passing through a certain element of area is called choose which one is correct:
(a) Electric lines of force
(b) Electric intensity
(c) Electric flux
(d) None of these
37. The concept of electric field theory was introduced by choose which one is correct:
(a) Kepler
(b) Newton
(c) Dalton
(d) Michael Faraday
38. The space around the charge within which other charges are influenced by it is called choose which one is correct:
(a) Electric field
(b) Magnetic field
(c) Electric flux
(d) Electric intensity
39. The force per unit charge is called choose which one is correct:
(a) Electric field
(b) Electric field intensity
(c) Electric potential energy
(d) Electric potential
40. The electric field exist around choose which one is correct:
(a) Charges
(b) On the left side
(c) At the -ve charge
(d) At the +ve charge
41. The practical application of electrostatic is choose which one is correct:
(a) Photocopier
(b) X-rays machines
(c) Laser
(d) All of above
42. The electric field lines emerge from the charges in choose which one is correct:
(a) Three dimensions
(b) Two dimensions
(c) One dimension
(d) All of above
43. The direction of electric intensity is choose which one is correct:
(a) Normal to the field
(b) Tangent to the field
(c) Parallel to the field
(d) None of above
44. When the field is strong, the lines of force are choose which one is correct:
(a) Closer
(b) Parallel
(c) Farther
(d) All of above
45. The electric lines of force determine the strength of an choose which one is correct:
(a) Gravitational field
(b) Constant field
(c) Magnetic field
(d) Electric field
46. The electric intensity is a choose which one is correct:
(a) Scalar quantity
(b) Vector quantity
(c) Physical quantity
(d) None of above
47. The unit of electric intensity is choose which one is correct:
(a) C/m2
(b) NIC
(c) Volt — meter
(d) Both (b) and (c)
48. If we increase the charge, the capacitance choose which one is correct:
(a) Decrease
(b) Constant
(c) Increase
(d) None of these
49. The electric intensity at a distance of 1m from the point charge is IBC is choose which one is correct:
(a) 9 x 109 N/C
(b) 9 x 106 N/C
(c) 9 x 103 N/C
(d) 9 NIC
50. When dielectric is placed between the plates it decrease the choose which one is correct:
(a) Electric intensity
(b) Electric force
(c) Surface charge density
(d) Potential difference
51. Another term used to mean electric lines of force is choose which one is correct:
(a) Electric field
(b) Permittivity
(c) Electric flux
(d) Equipotentials
52. The electric flux is given by the expression choose which one is correct:
(a) Electric field
(b) Permitivity
(c) Electric flux
(d) Equipotentials
53. Electric flux is a choose which one is correct:
(a) Vector quantity
(b) Scalar quantity
(c) Both (a) and (b)
(d) None of above
54. The SI unit of electric flux is choose which one is correct:
(a) Nm2/C2
(b) Nm/C2
(c) Nm2/C
(d) Nm/C
55. The formula = . A is applied when the area is choose which one is correct:
(a) Flat
(b) Curve
(c) Rounded
(d) Spherical
56. The electric lines of force are directed away from choose which one is correct:
(a) Positive charge
(b) Negative charge
(c) Both +ve and —ve
(d) None of above
57. Capacitance and potential difference are choose which one is correct:
(a) Directly proportional
(b) Equal
(c) Constant
(d) Inversely proportional
58. The electric intensity at infinite distance from the point charge is choose which one is correct:
(a) Infinite
(b) Zero
(c) Positive
(d) Negative
59. The number of electric lines of force passing through certain area is known as choose which one is correct:
(a) Electric intensity
(b) Electric field
(c) Electric flux
(d) All of above
60. The electric flux through any surface depends upon choose which one is correct:
(a) Area of surface
(b) Direction of surface
(c) Electric intensity
(d) All of above
61. In = EA cos, the angle is the angle between the field lines and choose which one is correct:
(a) Vector Area
(b) Electric intensity
(c) Potential
(d) None of these
62. The surface charge density is defined as choose which one is correct:
(a) Charge per unit volume
(b) Charge per unit mass
(c) Mass per unit area
(d) Charge per unit area
63. A capacitor’s capacitance can be increased by choose which one is correct:
(a) Increasing the area
(b) Decreasing the distance
(c) Placing the dielectric
(d) All of above
64. Faraday is a scientist choose which one is correct:
(a) English
(b) French
(c) American
(d) Spanish
65. The value of capacitance depends upon choose which one is correct:
(a) Charge on the plates
(b) Thickness of the plates
(c) Geometry of the capacitor
(d) All of above
66. The interior of a hollow charged metal sphere is a region which is choose which one is correct:
(a) Full of electric field lines
(b) Field free region
(c) Both (a) and (b)
(d) None of these
67. Gauss’s Law can only be applied to choose which one is correct:
(a) Surface of any shape
(b) Plane surface
(c) Closed surface
(d) A curved surface
68. Farad is the unit of choose which one is correct:
(a) Capacitance
(b) Conductance
(c) Current
(d) Electric flux
69. Intensity of field inside a Hallow charged sphere is choose which one is correct:
(a) Minimum
(b) Maximum
(c) Zero
(d) All of above
70. Capacitor is a device used for choose which one is correct:
(a) Storing charge
(b) Storing direct current
(c) Storing alternating current
(d) Storing voltage
71. Farad is the unit of choose which one is correct:
(a) Capacitance
(b) Conductance
(c) Current
(d) Electric flux
72. Work done in moving a charge (unit positive charge) from one point to another against the electric field is measure of choose which one is correct:
(a) Electric potential
(b) Potential difference
(c) Electric intensity
(d) Absolute potential
73. The SI unit of potential difference is choose which one is correct:
(a) Volt
(b) Ampere
(c) Joule
(d) Metre
74. Another name for electric potential energy per unit charge is choose which one is correct:
(a) Electric intensity
(b) Electric potential
(c) Electric force
(d) Electric flux
75. Work done in bringing a unit positive charge from infinity to that point in an electric field is choose which one is correct:
(a) Resistance
(b) Capacitance
(c) Absolute potential difference
(d) Electric potential
76. If an electron of charge “e” is accelerated a potential difference V it will acquire energy choose which one is correct:
(a) Ve
(b)
(c)
(d) Ve2
77. Electric potential is choose which one is correct:
(a) Vector quantity
(b) Neither scalar non vector
(c) Scalar quantity
(d) None of above
78. Another unit of electric intensity can be expressed as choose which one is correct:
(a)
(b)
(c)
(d)
79. In a region where the electric field is zero the electric potential is always choose which one is correct:
(a) Negative
(b) Positive
(c) Zero
(d) Constant
80. An electron volt is the unit of a choose which one is correct:
(a) Potential
(b) Electric potential energy
(c) Charge
(d) Power
81. The negative of the potential gradiant is choose which one is correct:
(a) Electric intensity
(b) Potential energy
(c) Charge
(d) Power
82. The change of potential w.r.t displacement is called choose which one is correct:
(a) Electric potential
(b) Electric intensity
(c) Potential gradient
(d) None of these
83. Coulomb multiplied by volt gives the unit will be called choose which one is correct:
(a) Ohm
(b) Bolt
(c) Ampere
(d) Joule
84. A charge of 0.10 C accelerated through a potential difference of 1000 volt acquires K.E.
(a) 100 J
(b) 200 J
(c) 100 ev
(d) 400 J
85. Which of the following forces are conservative choose which one is correct:
(a) Electric force
(b) Gravitational force
(c) Frictional force
(d) Both (a) and (b)
86. Which of the following forces is only repulsive choose which one is correct:
(a) Electrostatic force
(b) Gravitational force
(c) Storing nuclear force
(d) None of these
87. The unit of Fe/Fg is choose which one is correct:
(a) No unit
(b) Coulomb
(c) Newton
(d) None of these
88. The Millikan’s experiment apparatus also contains choose which one is correct:
(a) An atomizer
(b) Lens
(c) Microscope
(d) All of above
89. If a oil droplet between two oppositely charged parallel plates is suspended then choose which one is correct:
(a) Fg > Fe
(b) Fg < Fe
(c) Fg = Fe
(d) None of these
90. The charge on the electron was measured by Millikan in choose which one is correct:
(a) 1909
(b) 1905
(c) 1900
(d) 1910
91. The potential at a point situated at a distance of 50 cm from a charge of 5gc is choose which one is correct:
(a) 9 x 104 volts
(b) 9 x 102 volts
(c) 9 x 10-2 volts
(d) 9 x 10-4 volts
92. The earth’s potential is considered as choose which one is correct:
(a) Negative
(b) Positive
(c) Zero
(d) Infinite
93. The interior of a hollow charged sphere is a choose which one is correct:
(a) Strong field region
(b) Field free region
(c) Week field region
(d) None of above
94. The symbol e r denotes for choose which one is correct:
(a) Relative permitivity
(b) Dielectric constant
(c) Both (a) and (b)
(d) None of these
95. In a charged capacitor, the energy is stored due to choose which one is correct:
(a) Positive charge
(b) Electric field between the plates
(c) Negative
(d) None of these
96. The relative permitivity of air is choose which one is correct:
(a) 79.5
(b) 1.006
(c) 1.06
(d) 1.0006
97. A radio tunning capacitor is a choose which one is correct:
(a) Cylindrical capacitor
(b) Spherical capacitor
(c) Parallel plate capacitor
(d) None of these
98. The formula for energy density is valid for only choose which one is correct:
(a) At points of high field strength
(b) At points of low field strength
(c) At points of inter mediate field strength
(d) At all points
99. The dielectric consists of atoms and molecules which are choose which one is correct:
(a) Positively charged
(b) Negatively charged
(c) Neutral on the average
(d) None of these
100. The voltage across the capacitor at any instant can be obtained by choose which one is correct:
(a) Dividing q by C
(b) Dividing C by q
(c) Multiply q by C
(d) None of these