Physics Current Electricity Online Mcqs Test

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

2. Resistance of a conductor depends upon

3. The strength of an magnetic field depends upon the

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

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

6. The conductivity of a superconductor is

7. 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

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

9. The wire used in rheostat, is made from

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

11. 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

12. In a voltmeter the conduction takes place due to

13. The resistively ρ of Tungoston in Ωm is

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

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

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

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

18. Thermocouple is an arrangement of two different metals

19. The thermistors are usually made of

20. Heat energy dissipated in resistors is defined as:

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

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

23. Ohm’s law describes the mathematical relationship between

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

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

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

27. The graphical representation of Ohms law is

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

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

30. Internal resistance is the resistance offered by

31. 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?

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

33. The resistivity of wire depends upon:

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

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

36. Thermocouples convert heat energy into

37. Resistively depends upon the resistance of the material of

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

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

40. Kirchhoff’s first rule is also known as

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

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

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

44. The value of resistance depends upon

45. Photovoltaic cell converts:

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

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

48. The unit of conductance of a material is

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

 

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

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

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

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

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

56. 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

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

58. Specific resistance of a wire depends upon

59. 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

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

61. The resistivity of constant on is Ω m is

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

63. The colour coded carbon resistances are made by

64. The passage of an electric current produces

65. Reciprocal of resistivity is called

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

67. Thermocouples convert:

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

69. Current provided by a battery is maximum when

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

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

72. Electrical power dissipation in resistors is given by

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

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

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

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

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

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

80. 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?

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

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

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

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

85. Internal resistance is the resistance offered by

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

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

88. 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

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

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

91. If voltage across a resistance doubles

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

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

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

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

96. The resistivity ρ of copper in Ω m is

97. Potentiometer is more sensitive than voltmeter, because