Physics Current Electricity Online Mcqs Test

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

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

3. 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

4. The resistivity of constant on is Ω m is

5. In a voltmeter the conduction takes place due to

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

7. Thermocouple is an arrangement of two different metals

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

9. Current provided by a battery is maximum when

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

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

12. Potentiometer is more sensitive than voltmeter, because

13. Kirchhoff’s first rule is also known as

14. The resistivity ρ of copper in Ω m is

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

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

17. The passage of an electric current produces

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

19. Electrical power dissipation in resistors is given by

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

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

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

23. Thermocouples convert:

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

25. Resistively depends upon the resistance of the material of

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

27. The resistivity of wire depends upon:

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

29. Internal resistance is the resistance offered by

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

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

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

33. The thermistors are usually made of

34. The graphical representation of Ohms law is

35. The value of resistance depends upon

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

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

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

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

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

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

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

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

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

45. The resistively ρ of Tungoston in Ωm is

46. The strength of an magnetic field depends upon the

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

 

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

49. The unit of conductance of a material is

50. Photovoltaic cell converts:

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

52. Resistance of a conductor depends upon

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

54. The wire used in rheostat, is made from

55. 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?

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

57. 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

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

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

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

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

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

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

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

65. Heat energy dissipated in resistors is defined as:

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

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

68. Specific resistance of a wire depends upon

69. 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?

70. 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

71. The colour coded carbon resistances are made by

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

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

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

75. 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

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

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

78. Ohm’s law describes the mathematical relationship between

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

80. The conductivity of a superconductor is

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

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

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

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

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

86. Reciprocal of resistivity is called

87. Thermocouples convert heat energy into

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

89. Internal resistance is the resistance offered by

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

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

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

93. If voltage across a resistance doubles

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

95. 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

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

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