Physics Current Electricity Online Mcqs Test

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

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

3. Specific resistance of a wire depends upon

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

5. 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?

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

7. The resistivity of constant on is Ω m is

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

9. Heat energy dissipated in resistors is defined as:

10. The resistively ρ of Tungoston in Ωm is

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

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

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

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

15. The resistivity ρ of copper in Ω m is

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

17. Thermocouples convert:

18. Potentiometer is more sensitive than voltmeter, because

19. 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

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

21. The value of resistance depends upon

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

23. The strength of an magnetic field depends upon the

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

25. The graphical representation of Ohms law is

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

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

 

28. Ohm’s law describes the mathematical relationship between

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

30. The passage of an electric current produces

31. Current provided by a battery is maximum when

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

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

34. Kirchhoff’s first rule is also known as

35. Thermocouples convert heat energy into

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

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

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

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

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

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

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

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

44. The conductivity of a superconductor is

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

46. 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?

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

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

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

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

51. Reciprocal of resistivity is called

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

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

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

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

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

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

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

59. 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

60. The colour coded carbon resistances are made by

61. Resistance of a conductor depends upon

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

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

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

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

66. 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

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

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

69. Resistively depends upon the resistance of the material of

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

71. The wire used in rheostat, is made from

72. If voltage across a resistance doubles

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

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

75. In a voltmeter the conduction takes place due to

76. 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

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

78. The resistivity of wire depends upon:

79. Thermocouple is an arrangement of two different metals

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

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

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

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

84. The unit of conductance of a material is

85. Internal resistance is the resistance offered by

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

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

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

89. 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

90. Internal resistance is the resistance offered by

91. Electrical power dissipation in resistors is given by

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

93. Photovoltaic cell converts:

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

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

96. The thermistors are usually made of

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