Physics Current Electricity Online Mcqs Test

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

2. The conductivity of a superconductor is

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

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

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

6. The thermistors are usually made of

7. Resistively depends upon the resistance of the material of

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

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

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

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

12. Potentiometer is more sensitive than voltmeter, because

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

14. The wire used in rheostat, is made from

15. Current provided by a battery is maximum when

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

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

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

19. Heat energy dissipated in resistors is defined as:

20. Electrical power dissipation in resistors is given by

21. 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

22. 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

23. Internal resistance is the resistance offered by

24. 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

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

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

27. If voltage across a resistance doubles

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

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

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

31. The resistively ρ of Tungoston in Ωm is

32. The strength of an magnetic field depends upon the

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

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

35. Photovoltaic cell converts:

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

37. Resistance of a conductor depends upon

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

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

40. The resistivity of wire depends upon:

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

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

43. Kirchhoff’s first rule is also known as

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

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

46. 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?

47. Specific resistance of a wire depends upon

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

49. 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

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

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

52. The resistivity of constant on is Ω m is

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

54. Thermocouple is an arrangement of two different metals

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

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

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

58. 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

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

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

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

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

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

64. Thermocouples convert heat energy into

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. Cause of heat production in a current carrying conductor is

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

68. Internal resistance is the resistance offered by

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

70. The graphical representation of Ohms law is

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

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

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

74. In a voltmeter the conduction takes place due to

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

76. Ohm’s law describes the mathematical relationship between

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

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

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

80. Thermocouples convert:

81. Reciprocal of resistivity is called

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

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

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

 

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

86. The passage of an electric current produces

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

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

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

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

91. The resistivity ρ of copper in Ω m is

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

93. The value of resistance depends upon

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

95. The unit of conductance of a material is

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

97. The colour coded carbon resistances are made by