Physics Current Electricity Online Mcqs Test

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

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

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

4. Internal resistance is the resistance offered by

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

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

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

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

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

10. 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

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

12. Photovoltaic cell converts:

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

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

15. 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?

16. The wire used in rheostat, is made from

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

18. Potentiometer is more sensitive than voltmeter, because

19. The conductivity of a superconductor is

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

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

22. Thermocouples convert heat energy into

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

24. The passage of an electric current produces

25. 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

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

27. 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

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

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

30. Current provided by a battery is maximum when

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

32. Kirchhoff’s first rule is also known as

33. Specific resistance of a wire depends upon

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

35. In a voltmeter the conduction takes place due to

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

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

38. Internal resistance is the resistance offered by

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

40. The resistively ρ of Tungoston in Ωm is

41. Heat energy dissipated in resistors is defined as:

42. Thermocouple is an arrangement of two different metals

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

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

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

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

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

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

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

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

51. Electrical power dissipation in resistors is given by

52. 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

53. The resistivity of constant on is Ω m is

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

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

56. The value of resistance depends upon

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

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

 

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

60. Resistance of a conductor depends upon

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

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

63. 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

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

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

66. The strength of an magnetic field depends upon the

67. Ohm’s law describes the mathematical relationship between

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

69. 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?

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

71. The unit of conductance of a material is

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

73. The thermistors are usually made of

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

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

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

77. The resistivity ρ of copper in Ω m is

78. Reciprocal of resistivity is called

79. If voltage across a resistance doubles

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

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

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

83. The resistivity of wire depends upon:

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

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

86. Resistively depends upon the resistance of the material of

87. Thermocouples convert:

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

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

90. The graphical representation of Ohms law is

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

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

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

94. The colour coded carbon resistances are made by

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

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

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