Physics Current Electricity Online Mcqs Test

1. Electrical power dissipation in resistors is given by

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

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

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

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

6. Ohm’s law describes the mathematical relationship between

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

8. 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

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

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

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

12. Internal resistance is the resistance offered by

13. Resistively depends upon the resistance of the material of

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

15. Specific resistance of a wire depends upon

16. The value of resistance depends upon

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

18. Internal resistance is the resistance offered by

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

20. Resistance of a conductor depends upon

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

22. The strength of an magnetic field depends upon the

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

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

25. The passage of an electric current produces

26. Current provided by a battery is maximum when

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

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

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

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

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

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

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

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

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

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

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

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

39. Thermocouples convert heat energy into

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

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

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

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

44. The graphical representation of Ohms law is

45. The thermistors are usually made of

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

47. 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

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

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

50. 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?

51. If voltage across a resistance doubles

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

53. The unit of conductance of a material is

54. The resistivity ρ of copper in Ω m is

55. 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

56. 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

57. Thermocouples convert:

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

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

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

61. Heat energy dissipated in resistors is defined as:

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

63. In a voltmeter the conduction takes place due to

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

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

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

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

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

69. 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

70. The resistivity of constant on is Ω m is

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

72. The resistivity of wire depends upon:

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

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

75. The colour coded carbon resistances are made by

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

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

78. Photovoltaic cell converts:

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

80. Reciprocal of resistivity is called

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

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

83. The conductivity of a superconductor is

84. Thermocouple is an arrangement of two different metals

85. 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?

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

87. Potentiometer is more sensitive than voltmeter, because

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

 

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

90. The resistively ρ of Tungoston in Ωm is

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

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

93. The wire used in rheostat, is made from

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

95. Kirchhoff’s first rule is also known as

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

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