Physics Current Electricity Online Mcqs Test

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

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

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

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

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. The passage of an electric current produces

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

8. The value of resistance depends upon

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

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

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

12. 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

13. The strength of an magnetic field depends upon the

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

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

16. Reciprocal of resistivity is called

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

18. Photovoltaic cell converts:

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

20. 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?

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

22. If voltage across a resistance doubles

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

24. The resistively ρ of Tungoston in Ωm is

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

26. Internal resistance is the resistance offered by

27. Current provided by a battery is maximum when

28. Resistance of a conductor depends upon

29. 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

30. Electrical power dissipation in resistors is given by

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

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

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

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

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

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

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

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

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

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

41. 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

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

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

44. The wire used in rheostat, is made from

45. The resistivity of wire depends upon:

46. 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

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

48. In a voltmeter the conduction takes place due to

49. Internal resistance is the resistance offered by

50. The unit of conductance of a material is

51. 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

52. Thermocouple is an arrangement of two different metals

53. The resistivity ρ of copper in Ω m is

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

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

56. The conductivity of a superconductor is

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

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

59. The colour coded carbon resistances are made by

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

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

62. The resistivity of constant on is Ω m is

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

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

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

66. Specific resistance of a wire depends upon

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

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

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

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

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

72. Resistively depends upon the resistance of the material of

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

74. Thermocouples convert:

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

76. Kirchhoff’s first rule is also known as

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

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

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

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

81. The graphical representation of Ohms law is

82. Heat energy dissipated in resistors is defined as:

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

84. 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?

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

86. Thermocouples convert heat energy into

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

 

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

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

90. Ohm’s law describes the mathematical relationship between

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

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

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

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

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

96. The thermistors are usually made of

97. Potentiometer is more sensitive than voltmeter, because