Physics Current Electricity Online Mcqs Test

1. Ohm’s law describes the mathematical relationship between

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

3. Resistively depends upon the resistance of the material of

4. 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?

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

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

 

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

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

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

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

11. The resistively ρ of Tungoston in Ωm is

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

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

14. Thermocouples convert heat energy into

15. The passage of an electric current produces

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

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

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

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

20. Current provided by a battery is maximum when

21. Specific resistance of a wire depends upon

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

23. The value of resistance depends upon

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

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

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

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

28. 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

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

30. The resistivity of wire depends upon:

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

32. The resistivity ρ of copper in Ω m is

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

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

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

36. Internal resistance is the resistance offered by

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

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

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

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

41. The wire used in rheostat, is made from

42. Electrical power dissipation in resistors is given by

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

44. The thermistors are usually made of

45. Resistance of a conductor depends upon

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

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

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

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

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

51. 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

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

53. 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

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

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

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

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

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

59. The graphical representation of Ohms law is

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

61. 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

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

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

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

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

66. Thermocouple is an arrangement of two different metals

67. Photovoltaic cell converts:

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

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

70. Reciprocal of resistivity is called

71. The unit of conductance of a material is

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

73. The colour coded carbon resistances are made by

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

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

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

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

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

79. In a voltmeter the conduction takes place due to

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

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

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

83. 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?

84. 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

85. Heat energy dissipated in resistors is defined as:

86. The strength of an magnetic field depends upon the

87. If voltage across a resistance doubles

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

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

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

91. Potentiometer is more sensitive than voltmeter, because

92. Thermocouples convert:

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

94. The resistivity of constant on is Ω m is

95. Internal resistance is the resistance offered by

96. Kirchhoff’s first rule is also known as

97. The conductivity of a superconductor is