Physics Current Electricity Online Mcqs Test

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

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

3. Potentiometer is more sensitive than voltmeter, because

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

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

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

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

8. Current provided by a battery is maximum when

9. The unit of conductance of a material is

10. The graphical representation of Ohms law is

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

12. Thermocouple is an arrangement of two different metals

13. The resistivity ρ of copper in Ω m is

14. Heat energy dissipated in resistors is defined as:

15. Resistance of a conductor depends upon

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

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

18. The resistivity of wire depends upon:

19. Internal resistance is the resistance offered by

20. The wire used in rheostat, is made from

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

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

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

24. 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

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

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

27. The resistivity of constant on is Ω m is

28. Internal resistance is the resistance offered by

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

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

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

32. Electrical power dissipation in resistors is given by

33. The conductivity of a superconductor is

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

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

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

37. Kirchhoff’s first rule is also known as

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

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

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

41. Reciprocal of resistivity is called

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

43. The resistively ρ of Tungoston in Ωm is

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

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

46. 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

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

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

49. 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?

50. In a voltmeter the conduction takes place due to

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

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

53. 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?

54. Resistively depends upon the resistance of the material of

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

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

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

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

59. The value of resistance depends upon

60. Specific resistance of a wire depends upon

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

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

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

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

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

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

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

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

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

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

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

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

73. Thermocouples convert heat energy into

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

75. The thermistors are usually made of

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

77. Photovoltaic cell converts:

78. The colour coded carbon resistances are made by

79. If voltage across a resistance doubles

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

81. Thermocouples convert:

82. 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

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

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

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

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

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

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

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

90. Ohm’s law describes the mathematical relationship between

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

92. 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

93. The strength of an magnetic field depends upon the

94. 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

95. The passage of an electric current produces

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

 

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