Physics Current Electricity Online Mcqs Test

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

2. The resistivity of constant on is Ω m is

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

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

5. Internal resistance is the resistance offered by

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

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

8. Electrical power dissipation in resistors is given by

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

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

11. 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

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

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

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

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

16. The resistivity ρ of copper in Ω m is

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

 

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

19. Reciprocal of resistivity is called

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

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

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

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

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

25. 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

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

27. Ohm’s law describes the mathematical relationship between

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

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

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

31. The resistively ρ of Tungoston in Ωm is

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

33. The wire used in rheostat, is made from

34. Thermocouple is an arrangement of two different metals

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

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

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

38. The colour coded carbon resistances are made by

39. Internal resistance is the resistance offered by

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

41. Resistance of a conductor depends upon

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

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

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

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

46. 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?

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

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

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

50. 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

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

52. Potentiometer is more sensitive than voltmeter, because

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

54. The strength of an magnetic field depends upon the

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

56. Thermocouples convert:

57. The unit of conductance of a material is

58. The passage of an electric current produces

59. Thermocouples convert heat energy into

60. In a voltmeter the conduction takes place due to

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

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. Specific resistance of a wire depends upon

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

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

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

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

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

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

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

71. Current provided by a battery is maximum when

72. The thermistors are usually made of

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

74. The conductivity of a superconductor is

75. Kirchhoff’s first rule is also known as

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

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

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

79. Resistively depends upon the resistance of the material of

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

81. The value of resistance depends upon

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

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

84. 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

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

86. 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?

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

88. Heat energy dissipated in resistors is defined as:

89. The resistivity of wire depends upon:

90. If voltage across a resistance doubles

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

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

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

94. Photovoltaic cell converts:

95. The graphical representation of Ohms law is

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

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