Physics Current Electricity Online Mcqs Test

1. The passage of an electric current produces

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

3. 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

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

5. 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?

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

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

8. Resistively depends upon the resistance of the material of

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

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

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

12. The colour coded carbon resistances are made by

13. Potentiometer is more sensitive than voltmeter, because

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

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

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

17. The resistivity ρ of copper in Ω m is

18. The unit of conductance of a material is

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

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

21. 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

22. If voltage across a resistance doubles

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

 

24. 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

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

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

27. 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?

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

29. The resistively ρ of Tungoston in Ωm is

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

31. Electrical power dissipation in resistors is given by

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

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

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

35. Resistance of a conductor depends upon

36. The resistivity of constant on is Ω m is

37. 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

38. Internal resistance is the resistance offered by

39. Photovoltaic cell converts:

40. The value of resistance depends upon

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

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

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

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

45. Internal resistance is the resistance offered by

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

47. Thermocouple is an arrangement of two different metals

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

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

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

51. The resistivity of wire depends upon:

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

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

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

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

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

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

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

59. The thermistors are usually made of

60. Ohm’s law describes the mathematical relationship between

61. Specific resistance of a wire depends upon

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

63. Current provided by a battery is maximum when

64. The conductivity of a superconductor is

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

66. The strength of an magnetic field depends upon the

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

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

69. In a voltmeter the conduction takes place due to

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

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

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

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

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

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

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

77. The wire used in rheostat, is made from

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

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

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

81. Kirchhoff’s first rule is also known as

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

83. Thermocouples convert:

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

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

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

87. Heat energy dissipated in resistors is defined as:

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

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

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

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

92. 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

93. Thermocouples convert heat energy into

94. The graphical representation of Ohms law is

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

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

97. Reciprocal of resistivity is called