Physics Current Electricity Online Mcqs Test

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

2. 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

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

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

5. 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?

6. Photovoltaic cell converts:

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

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

9. The wire used in rheostat, is made from

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

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

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

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

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

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

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

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

19. The conductivity of a superconductor is

20. The passage of an electric current produces

21. The graphical representation of Ohms law is

22. Thermocouples convert heat energy into

23. Ohm’s law describes the mathematical relationship between

24. 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

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

26. Heat energy dissipated in resistors is defined as:

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

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

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

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

31. 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

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

33. The resistively ρ of Tungoston in Ωm is

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

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

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

37. Internal resistance is the resistance offered by

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

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

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

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

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

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

45. If voltage across a resistance doubles

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

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

48. Resistance of a conductor depends upon

49. Kirchhoff’s first rule is also known as

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

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

52. Potentiometer is more sensitive than voltmeter, because

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

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

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

56. Resistively depends upon the resistance of the material of

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

58. Thermocouple is an arrangement of two different metals

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

60. Reciprocal of resistivity is called

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

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

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

64. The resistivity of constant on is Ω m is

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

66. Specific resistance of a wire depends upon

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

68. Internal resistance is the resistance offered by

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

70. The strength of an magnetic field depends upon the

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

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

73. The resistivity ρ of copper in Ω m is

74. Electrical power dissipation in resistors is given by

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

76. The colour coded carbon resistances are made by

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

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

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

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

81. The value of resistance depends upon

82. Current provided by a battery is maximum when

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

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

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

86. In a voltmeter the conduction takes place due to

87. The resistivity of wire depends upon:

88. The thermistors are usually made of

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

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

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

92. The unit of conductance of a material is

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

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

 

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

96. 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

97. Thermocouples convert: