Physics Current Electricity Online Mcqs Test

1. Heat energy dissipated in resistors is defined as:

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

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

4. Specific resistance of a wire depends upon

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

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. 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

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

9. The thermistors are usually made of

10. The value of resistance depends upon

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

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

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

14. The resistivity of wire depends upon:

15. The resistivity ρ of copper in Ω m is

16. The resistively ρ of Tungoston in Ωm is

17. 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

18. Internal resistance is the resistance offered by

19. Thermocouples convert heat energy into

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

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

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

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

24. Potentiometer is more sensitive than voltmeter, because

25. 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?

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

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

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

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

30. Reciprocal of resistivity is called

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

32. Internal resistance is the resistance offered by

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

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

35. Electrical power dissipation in resistors is given by

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

37. Kirchhoff’s first rule is also known as

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

39. Resistance of a conductor depends upon

40. 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?

41. The resistivity of constant on is Ω m is

42. The strength of an magnetic field depends upon the

43. The wire used in rheostat, is made from

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

45. Resistively depends upon the resistance of the material of

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

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

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

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

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

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

52. In a voltmeter the conduction takes place due to

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

54. 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

55. Thermocouple is an arrangement of two different metals

56. Ohm’s law describes the mathematical relationship between

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

58. If voltage across a resistance doubles

59. The conductivity of a superconductor is

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

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

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

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

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

65. The passage of an electric current produces

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

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

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

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

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

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

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

73. The graphical representation of Ohms law is

74. 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

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

76. Thermocouples convert:

77. Photovoltaic cell converts:

78. The unit of conductance of a material is

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

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

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

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

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

84. 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

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

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

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

88. Current provided by a battery is maximum when

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

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

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

 

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

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

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

95. The colour coded carbon resistances are made by

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

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