Physics Current Electricity Online Mcqs Test

1. Thermocouples convert heat energy into

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

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

4. The thermistors are usually made of

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

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

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

 

8. 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

9. The passage of an electric current produces

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

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

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

13. Heat energy dissipated in resistors is defined as:

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

15. If voltage across a resistance doubles

16. Internal resistance is the resistance offered by

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

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

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

20. The resistively ρ of Tungoston in Ωm is

21. Resistively depends upon the resistance of the material of

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

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

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

25. Thermocouples convert:

26. The resistivity of wire depends upon:

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

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

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

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

31. Reciprocal of resistivity is called

32. 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

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

34. Current provided by a battery is maximum when

35. Ohm’s law describes the mathematical relationship between

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

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

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

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

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

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

42. Photovoltaic cell converts:

43. 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?

44. 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

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

46. In a voltmeter the conduction takes place due to

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

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

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

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

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

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

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

54. Internal resistance is the resistance offered by

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

56. 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?

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

58. Kirchhoff’s first rule is also known as

59. The unit of conductance of a material is

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

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

62. The resistivity ρ of copper in Ω m is

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

64. 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

65. The value of resistance depends upon

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

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

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

69. Potentiometer is more sensitive than voltmeter, because

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

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

72. The colour coded carbon resistances are made by

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

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

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

76. The resistivity of constant on is Ω m is

77. Resistance of a conductor depends upon

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

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

80. The graphical representation of Ohms law is

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

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

83. The wire used in rheostat, is made from

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. Thermocouple is an arrangement of two different metals

86. Electrical power dissipation in resistors is given by

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

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

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

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

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

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

93. The strength of an magnetic field depends upon the

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

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

96. The conductivity of a superconductor is

97. Specific resistance of a wire depends upon