Physics Current Electricity Online Mcqs Test

1. The resistively ρ of Tungoston in Ωm is

2. The value of resistance depends upon

3. In a voltmeter the conduction takes place due to

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

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

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

7. 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?

8. The resistivity of wire depends upon:

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

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

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

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

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

14. 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

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

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

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

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

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

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

21. Internal resistance is the resistance offered by

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

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

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

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

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

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

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

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

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

31. Resistively depends upon the resistance of the material of

32. Resistance of a conductor depends upon

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

34. 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

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

36. Internal resistance is the resistance offered by

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

38. The passage of an electric current produces

39. The unit of conductance of a material is

40. If voltage across a resistance doubles

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

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

43. Kirchhoff’s first rule is also known as

44. Thermocouples convert heat energy into

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

46. The conductivity of a superconductor is

47. Electrical power dissipation in resistors is given by

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

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

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

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

52. The graphical representation of Ohms law is

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

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

55. 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?

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

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

58. Current provided by a battery is maximum when

59. The resistivity of constant on is Ω m is

60. Heat energy dissipated in resistors is defined as:

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

62. The resistivity ρ of copper in Ω m is

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

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

65. 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

66. The strength of an magnetic field depends upon the

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

 

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

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

70. Specific resistance of a wire depends upon

71. Thermocouple is an arrangement of two different metals

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

73. Potentiometer is more sensitive than voltmeter, because

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

75. 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

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

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

78. The thermistors are usually made of

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

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

81. Reciprocal of resistivity is called

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

83. Thermocouples convert:

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

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

86. Ohm’s law describes the mathematical relationship between

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

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

89. Photovoltaic cell converts:

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

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

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

93. The wire used in rheostat, is made from

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

95. The colour coded carbon resistances are made by

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

97. 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