Physics Current Electricity Online Mcqs Test

1. Reciprocal of resistivity is called

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

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

4. The unit of conductance of a material is

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

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

7. Internal resistance is the resistance offered by

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

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

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

11. The strength of an magnetic field depends upon the

12. 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?

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

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

15. The wire used in rheostat, is made from

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

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

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

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

20. Thermocouple is an arrangement of two different metals

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

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

23. Electrical power dissipation in resistors is given by

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

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

26. If voltage across a resistance doubles

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

28. The value of resistance depends upon

29. The conductivity of a superconductor is

30. 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?

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

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

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

34. Specific resistance of a wire depends upon

35. Kirchhoff’s first rule is also known as

36. The resistivity of wire depends upon:

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

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

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

40. The resistivity of constant on is Ω m is

41. Thermocouples convert:

42. The resistively ρ of Tungoston in Ωm is

43. 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

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

45. Resistance of a conductor depends upon

46. Thermocouples convert heat energy into

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

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

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

50. The colour coded carbon resistances are made by

51. 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

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

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

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

55. The passage of an electric current produces

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

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

58. 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

59. Internal resistance is the resistance offered by

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

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

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

63. The graphical representation of Ohms law is

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

65. Photovoltaic cell converts:

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

67. In a voltmeter the conduction takes place due to

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

 

69. 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

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

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

72. The thermistors are usually made of

73. Ohm’s law describes the mathematical relationship between

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

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

76. Potentiometer is more sensitive than voltmeter, because

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

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

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

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

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

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

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

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

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

86. Heat energy dissipated in resistors is defined as:

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

88. Current provided by a battery is maximum when

89. 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

90. Resistively depends upon the resistance of the material of

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

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

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

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

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

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

97. The resistivity ρ of copper in Ω m is