Physics Current Electricity Online Mcqs Test

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

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

3. The wire used in rheostat, is made from

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

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

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

7. The resistivity of wire depends upon:

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

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

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

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

12. The resistivity ρ of copper in Ω m is

13. The unit of conductance of a material is

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

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

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

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

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

19. The resistively ρ of Tungoston in Ωm is

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

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

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

 

23. The conductivity of a superconductor is

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

25. Thermocouples convert heat energy into

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

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

28. Heat energy dissipated in resistors is defined as:

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

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

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

32. Internal resistance is the resistance offered by

33. Resistance of a conductor depends upon

34. Current provided by a battery is maximum when

35. 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?

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

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

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

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

40. Thermocouples convert:

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

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

43. If voltage across a resistance doubles

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

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

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

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

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

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

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

51. The passage of an electric current produces

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

53. The resistivity of constant on is Ω m is

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

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

56. Ohm’s law describes the mathematical relationship between

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

58. 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

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

60. 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

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

62. 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

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

64. The value of resistance depends upon

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

66. 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?

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

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

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

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

71. Thermocouple is an arrangement of two different metals

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

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

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

75. Reciprocal of resistivity is called

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

77. 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

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

79. Photovoltaic cell converts:

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

81. 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

82. The colour coded carbon resistances are made by

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

84. Resistively depends upon the resistance of the material of

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

86. The thermistors are usually made of

87. In a voltmeter the conduction takes place due to

88. Kirchhoff’s first rule is also known as

89. The strength of an magnetic field depends upon the

90. Electrical power dissipation in resistors is given by

91. Specific resistance of a wire depends upon

92. Potentiometer is more sensitive than voltmeter, because

93. Internal resistance is the resistance offered by

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

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

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

97. The graphical representation of Ohms law is