Physics Current Electricity Online Mcqs Test

1. Conventional current (l) is due to the motion of:

2. The reciprocal of the resistance of a conductor is called

3. A battery of emf 12V and internal resistance 0.5 is charged by a battery charger which supplied a 132 V d.c. supply using a series resistance of 11.5. What is the terminal voltage of the battery during changing?

4. A wire having very high value of conductance is said to be

5. The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of resistor is

6. Photovoltaic cell converts:

7. Thermocouple is an arrangement of two different metals

8. The passage of an electric current produces

9. A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be

10. Resistance of a conductor depends upon

11. A certain charge liberates 0.8 g of oxygen. The same charge will liberate, how many g of silver

12. The strength of an magnetic field depends upon the

13. Resistively depends upon the resistance of the material of

14. A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

15. In carbon colour coded resistance, the fourth Gold ban indicates the tolerance is

16. Electromotive force is not a force and is measured in

17. Every source of current converts some non-electrical energy into

18. Kirchhoff’s first rule is also known as

19. The current through a metallic conductor is due to the motion of

20. A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts:

21. In a house circuit, all electrical appliances are connected in parallel to each other between the line and neutral wires to get:

22. The resistance of the given conductor can be increased by

23. The resistivity of wire depends upon:

24. When the resistors are connected in series, the equivalent resistance is always:

25. A conductor which obeys Ohm’s law is called

26. Terminal potential difference of a battery is greater than its emf when

27. The resistance of a conductor increases with the increase in its:

28. Two resistances of 2Ω and 3Ω connected in series are attached to a source of 20 V. The potential difference across 3Ω resistance is

29. Two electric bulbs of 200 W and 100 W have same voltage. If R₁ and R₂ be their resistance respectively then

30. In the figure a carbon resistor has bands of different colours on its body as mentioned in. the value of the resistance is

31. The electromotive force of a battery or cell is the voltage between its terminals when:

32. A factory gets its electrical power from a generator two miles away. The wires connecting the generator to the factory terminals have a resistance of 0.04 Ω/miles. When the generator supplies 50 Ampere to the factory, the terminal voltage at the generator is 120 Volts. A voltmeter connected to the factory terminals should then read

33. Due to collisions of electrons, with the atoms of conductor, the energy transfer ultimately to the

34. Specific resistance of a wire depends upon

35. The conductivity of a superconductor is

36. If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

37. The charge on an electron is known to be 1.6 x 10¯¹⁹ coulomb. In a circuit the current flowing is 1 A. How many electrons will be flowing through the circuit in a second?

38. Thermocouples convert:

39. If doubling the voltage across a resistor doubles the current through the resistor then

40. The unit of conductance of a material is

41. The graphical representation of Ohms law is

42. The value of resistance depends upon

43. The electric motors uses the effect of current passing through them is

44. The wire used in rheostat, is made from

45. The colour coded carbon resistances are made by

46. A wire of resistance 3.0 W is stretched to twice its original length, The resistance of the new wire will be

47. Three resistors of resistance 2, 3 and 6 ohms are connected in parallel, their equivalent resistance is

48. The thermistors are usually made of

49. A heater coil rated at (1000 W – 200 V) is connected to 110 volt line. What will be the power consumed?

50. Which one is the best material for making connecting wires?

51. A piece of fuse wire melts when a current of 15 ampere flows through it. With this current, if it dissipates 22.5 W, the resistance of fuse wire will be

52. Cause of heat production in a current carrying conductor is

53. When same current passes for same time through a thick and thin wire

54. Internal resistance is the resistance offered by

55. The chemical changes produced during the electrolysis are due to chemical effect of

56. A wheat stone bridge is said to be balanced when?

57. Two resistances of 2Ω and 3Ω connected in parallel are attached to a source of 20 V. The current through 3Ω resistance is

58. Reciprocal of resistivity is called

59. If the resistance in a circuit with constant voltage increases, the current will

60. Electrical power dissipation in resistors is given by

61. The drifty velocity of free electrons in a metallic conductor is

62. A conducting wire is drawn to double its length. Final resistivity of the material will be:

63. What is the current (I) in the circuit, as shown in the figure.

64. Power dissipated in the form of ‘V’ and ‘R’ can be determine as:

65. High negative temperature coefficient thermistors are very accurate for measuring low temperature near

66. Current provided by a battery is maximum when

67. Production of heat due to an electric current following through a conductor is given by

68. A 60 W bulb operates on 220 V supply. The current flowing through bulb is

69. When the temperature of a metallic conductor is increased its resistance:

70. Ohm’s law describes the mathematical relationship between

71. Potentiometer is more sensitive than voltmeter, because

72. If potential difference across the conductor is one volt and one ampere current is flowing, then resistance of the conductor is:

73. In a voltmeter the conduction takes place due to

74. The emf is the “cause” and potential difference is its

75. The resistively ρ of Tungoston in Ωm is

76. A 100 watt bulb is operated by 200 volt, the current flowing through the bulb is:

77. If the voltage across a fixed value of resistance is increased five times, what does the current do?

78. What electromotive force would cause 20 A of current to flow through a 500 Ω resistor?

79. Which one of the following causes production of heat when current is set up in a wire?

80. At ordinary temperature, an increase in temperature increases the conductivity of

81. A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

82. Thermocouples convert heat energy into

83. Resistance of wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is

84. In liquids and gases, the current is due to the motion of:

85. In the circuit each of the three resistances has a resistance 30Ω. The potential difference across R₁ is

 

86. The potential difference between head and tail of an electric eel (fish) up to

87. Heat energy dissipated in resistors is defined as:

88. A cell of emf 1.56 Volt is connected directly to an ammeter of resistance 0.05Ω. If the current in the circuit is 2.0A, the internal resistance of the cell is

89. Internal resistance is the resistance offered by

90. What type of temperature coefficient of resistance is thermistors?

91. If voltage across a resistance doubles

92. A car battery has e.m.f. 12 volt and internal resistance 5 x 10¯² ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

93. The resistivity ρ of copper in Ω m is

94. The potential difference across each resistance in series combination, if the resistances are different, is

95. A wire of uniform area of cross-section A length La and resistance R is cut into two parts. Resistivity of each part

96. The resistivity of constant on is Ω m is

97. As the charge flows through the conductor energy is dissipated in the form of: