# 100+ Basic Electricity Objective Questions and Answers

In this article, we shared the basic electricity objective questions and answers for electrical and electronics engineers.

## Basic Electricity Objective Questions

The below list provides all the multiple-choice questions related to basic electricity.

Answers are available at the bottom of the article.

1. The minimum charge on an ion is

2. The electrons revolve around the nucleus with high velocity. The force which acts against the centrifugal force and keeps the electrons in their orbits is

3. A 100 watt light bulb burns on an average of 10 hours a day for one week. The weekly consumption of energy will be ____unit/s.

4. If a very flexible wire is laid out in the shape of a hair pin with its two ends secured, what shape will the wire tend to assume if a current is passed through it?

5. The minimum requirements for causing flow of current are

6. For a fixed supply voltage the current flowing through a conductor will increase when its

7. If Two bulbs of 500W and 200 W rated at 250 V will have resistance ratio as

8. Out of the following which is not a poor conductor?

9. If I, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to

10. International ohm is defined in terms of the resistance of

11. The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature coefficient of the filament is

12. The thermocouple can not act as

13. The equivalent resistance in series combination is

14. In electric kettle water boils in 10 minutes. It is required to boil the boiler in 15 minutes, using the same supply mains

15. If the efficiency of a machine is to be high, what should be low?

16. When one leg of the parallel circuit is opened out the total current will

17. An electron charge (e) is revolving in a circular orbit of radius r round a nucleus of charge Ze with speed y. The equivalent current is

18. 1 microvolt is

19. What is the name of graph between temperature and thermo emf. ?

20. Four 100 W bulbs are connected in parallel across 200 V supply line. If one bulb gets fused

21. The length of a conductor is halved. Its conductance will be

22. The four bulbs of 40 W each are connected in series with a battery across them, which of the following statement is true?

23. Through a metallic conductor an electric current is due to drift of

24. 1 angstrom is equal to

25. A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will

26. What is converted into heat when current is set up through a conductor?

27. “The total electric flux through any closed surface surrounding charges is equal to the amount of charges enclosed.” The above statement is based on

28. The insulation on a current-carrying conductor is provided

29. Ohm’s law is not applicable to

30. The rating of a fuse wire is always expressed in

31. Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?

32. The Thomson coefficient for lead is

33. The electrical energy required to heat a bucket of water to a certain temperature is 4 kWh. If the heat losses are 20 percent, the energy input is

34. A field of force can exist only between

35. Electric current is a quantity

36. The fuse-wire is made of

37. Which method can be used for absolute measurement of resistances?

38. Resistance of 220 V, 100 W lamp will be

39. Which of the following statement is true both for a series and a parallel D.C. circuit?

40. The unit of Peltier coefficient is

41. Two bulbs 100 W, 250 V, and 200 W, 250 V are connected in series across a 500 V line. Then

42. When an electric current passes through a bucket full of water, a lot of bubbling is observed. This suggests that the type of supply is

43. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?

44. Two heaters, rated at 1000 W, 250 V each are connected in series across a 250 V, 50 Hz ac mains. The total power drawn from the supply would be ____ W.

45. Which of the following has a negative temperature coefficient of resistance?

46. It becomes more difficult to remove

47. All of the following are equivalent to watt except

48. Which of the following does not use heating effect of electric current?

49. According to the fuse law, the current-carrying capacity varies as

50. The property of a conductor due to which it passes current is called

51. The electrical conductivity of metals is typically df the order of (in​​)

52. Correct form of Ohm’s law

53. Which of the following lamps will have the least resistance at room temperature?

54. Identify the set in which all the three materials are good conductors of electricity

55. Bulbs in street Lighting are all connected in

56. Three conductances in parallel have the values G1 = 2000 μ mho, G2 = 3000 μ mho and Gs = 4000 μ mho. The total conductance will be

57. Water is an excellent solvent because its molecules are

58. How many 200 W/220 V incandescent lamps connected in series would consume the same total power as a single 100 W/220 V incandescent lamp?

59. Three 60W bulbs are in parallel across the 60V power line. If one bulb burns open

60. The ratio of mass of proton to that of electron is nearly

61. Electric current passing through the circuit produces

62. The condition for the validity of Ohm’ s law is that the

63. When electric current passes through a metallic conductor, its temperature rises. This is due to

64. Two wires A and B of the same material and length l and 2l have radius r and 2r respectively. The ratio of their specific resistance will be

65. The draft velocity of electrons is

66. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes

67. Ohm’s law is not applicable to

68. Ohm’s law is applicable to

69. The maximum current rating for a 10 kω, 0.5 W resistor is

70. Which of the following statement is correct?

71. Which of the following could be th value of resistivity of copper?

72. An isolated conducting sphere is given a positive charge. It’s mass

73. Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.

74. Current velocity through a copper conductor is

75. In gases the flow of current is due to

76. The thermo-electric power at the neutral temperature is

77. Electric pressure is also called

78. A 200 W, 230 V lamp is connected across 115 V supply. The lamp will draw power

79. Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be

80. When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is

81. The electric current in a liquid is due to the flow of

82. The draft velocity of electrons is

83. The flow of current in solids is due to

84. What is thermoelectric power? It is the rate of change of thermo emf with

85. The quantity of electricity analogous to friction in linear mechanical motion is

86. Which of the following statements is incorrect?

87. A substance whose molecules consist of dissimilar atoms is called

88. A glass rod when rubbed with silk cloth is charged because

89. A 500 W, 220 V bulb is supplied with 110V. Power consumption by the bulb will be

90. When subjected to a transverse electric field, cathode rays move

91. Which of the following can have a negative temperature coefficient?

92. Which is the best conductor of electricity?

93. For testing appliances, the wattage of the test lamp should be

94. When there is an electric current through a conducting wire along its length, then an electric field must exist.

95. Resistance of a tungsten lamp ____ as applied voltage increases

96. Sparking occurs when a load is switched off because the circuit has high

97. Two incandescent light bulbs of 40 W and 60 W rating are connected in series across the mains. Then

98. The thermal speed of electrons is of the order of

99. One newton metre is same as

100. A region surrounding a stationary electric dipole has

101. In the case of direct current

102. The substances which have a large number of free electrons and offer a low resistance are called

103. The thickness of insulation provided on the conductor depends on

104. Switching of a lamp in house produces noise in the radio. This is because switching operation produces

105. The resistance of human body is around

106. In a lamp load when more than one lamp are switched on the total resistance of the load

107. When current flows through heater coil it glows but supply wiring does not glow because

108. As the temperature of hot junction increases, the thermo emf :

109. Pure metals generally have

110. A steady current flows in a metallic conductor of non-uniform cross-section. Out of the following physical quantities, the one which remains constant is

111. The conductivity of a super-conductor is

112. The number of electrons in the outermost orbit of carbon atom is

113. An electrical lamp consumes 100 W of power. If the supply voltage is 220V the energy consumed in 30 minutes is

114. Which of the following is not reversible?

115. Which of the following characteristics of electrons determines the current in a conductor?

116. While using electricity and paying the electric bills one pay for

117. The flow of electric current in a conductor is due to flow of

118. What is the nature of graph between temperature and thermoelectric power ?

119. Which of the following relation is incorrect?

120. If a parallel circuit is opened in the main line, the current

121. Seebeck effect is inverse of

122. All good conductors have high

123. When an electric current flows through a conductor, its temperature rises. This is because of

124. Which of the following is not equivalent to watts?

125. An electric current is the

126. Resistance of carbon filament lamp ____ as the applied voltage increases

127. When the resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will

128. A nichrome wire used as a heater coil has a resistance of 2 ω/m. For a heater of 1 kW at 200 V, the length of wire required will be

129. The dimensions of the emf of a source of current are that of

130. Current velocity through a copper conductor is

131. The electric field at a point on the equatorial line of a dipole, and the direction of the dipole moment