Physics Current Electricity Online Mcqs Test

1. Reciprocal of resistivity is called

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

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

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

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

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

7. Thermocouples convert heat energy into

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

9. Specific resistance of a wire depends upon

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

12. Electrical power dissipation in resistors is given by

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

14. In a voltmeter the conduction takes place due to

15. The graphical representation of Ohms law is

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

17. Thermocouples convert:

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

19. The colour coded carbon resistances are made by

20. The strength of an magnetic field depends upon the

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

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

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

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

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

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

27. Photovoltaic cell converts:

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

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

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

31. The resistively ρ of Tungoston in Ωm is

32. The resistivity of wire depends upon:

33. Kirchhoff’s first rule is also known as

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

35. 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

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

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

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

39. Resistively depends upon the resistance of the material of

40. The resistivity ρ of copper in Ω m is

41. Current provided by a battery is maximum when

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

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

44. Internal resistance is the resistance offered by

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

46. Thermocouple is an arrangement of two different metals

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

 

48. 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

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

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

51. The passage of an electric current produces

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

53. The unit of conductance of a material is

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

55. The resistivity of constant on is Ω m is

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

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

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

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

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

61. Internal resistance is the resistance offered by

62. Resistance of a conductor depends upon

63. 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?

64. 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

65. 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?

66. 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

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

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

69. Heat energy dissipated in resistors is defined as:

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

71. The wire used in rheostat, is made from

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

73. Ohm’s law describes the mathematical relationship between

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

75. Potentiometer is more sensitive than voltmeter, because

76. If voltage across a resistance doubles

77. The conductivity of a superconductor is

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

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

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

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

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

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

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

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

86. The thermistors are usually made of

87. The value of resistance depends upon

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

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

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

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

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

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

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

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

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

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