Physics Current Electricity Online Mcqs Test

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

2. 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

3. 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?

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

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

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

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

8. Ohm’s law describes the mathematical relationship between

9. In a voltmeter the conduction takes place due to

10. Potentiometer is more sensitive than voltmeter, because

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

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

13. Specific resistance of a wire depends upon

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

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

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

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

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

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

20. The graphical representation of Ohms law is

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

22. 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

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

24. The passage of an electric current produces

25. The resistivity of constant on is Ω m is

26. 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?

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. Internal resistance is the resistance offered by

29. The thermistors are usually made of

30. Internal resistance is the resistance offered by

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

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

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

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

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

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

37. The resistivity ρ of copper in Ω m is

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

39. If voltage across a resistance doubles

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

41. Thermocouples convert heat energy into

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

43. 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

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

45. Thermocouple is an arrangement of two different metals

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

47. Resistance of a conductor depends upon

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

 

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

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

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

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

53. Thermocouples convert:

54. Electrical power dissipation in resistors is given by

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

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

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

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

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

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

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

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

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

64. Current provided by a battery is maximum when

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

66. Photovoltaic cell converts:

67. The colour coded carbon resistances are made by

68. Resistively depends upon the resistance of the material of

69. The wire used in rheostat, is made from

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

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

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

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

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

75. Kirchhoff’s first rule is also known as

76. The strength of an magnetic field depends upon the

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

78. The value of resistance depends upon

79. Reciprocal of resistivity is called

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

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

82. The resistively ρ of Tungoston in Ωm is

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

84. The unit of conductance of a material is

85. 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

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

87. The conductivity of a superconductor is

88. 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

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

90. The resistivity of wire depends upon:

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

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

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

94. Heat energy dissipated in resistors is defined as:

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

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

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