Physics Current Electricity Online Mcqs Test

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

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

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

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

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

6. The conductivity of a superconductor is

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

8. Specific resistance of a wire depends upon

9. Resistance of a conductor depends upon

10. Photovoltaic cell converts:

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

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

13. Internal resistance is the resistance offered by

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

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

16. The resistively ρ of Tungoston in Ωm is

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

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

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

 

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

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

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

23. Ohm’s law describes the mathematical relationship between

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

25. In a voltmeter the conduction takes place due to

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

27. 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

28. 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?

29. Heat energy dissipated in resistors is defined as:

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

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

32. 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

33. Thermocouple is an arrangement of two different metals

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

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

36. The graphical representation of Ohms law is

37. The value of resistance depends upon

38. Thermocouples convert heat energy into

39. Resistively depends upon the resistance of the material of

40. The resistivity ρ of copper in Ω m is

41. The strength of an magnetic field depends upon the

42. The resistivity of constant on is Ω m is

43. 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

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

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

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

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

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

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

50. Reciprocal of resistivity is called

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. The unit of conductance of a material is

53. Kirchhoff’s first rule is also known as

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

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

56. Thermocouples convert:

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

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

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

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

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

62. 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?

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

64. The colour coded carbon resistances are made by

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

66. If voltage across a resistance doubles

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

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

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

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

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

72. The thermistors are usually made of

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

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

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

76. The wire used in rheostat, is made from

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

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

79. Internal resistance is the resistance offered by

80. 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

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

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

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

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

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

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

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

88. The passage of an electric current produces

89. Potentiometer is more sensitive than voltmeter, because

90. Current provided by a battery is maximum when

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

92. Electrical power dissipation in resistors is given by

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

94. The resistivity of wire depends upon:

95. Three resistors of resistance 2, 3 and 6 ohms are connected in parallel, their equivalent resistance 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. High negative temperature coefficient thermistors are very accurate for measuring low temperature near