Physics Current Electricity Online Mcqs Test

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

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

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

4. The wire used in rheostat, is made from

5. Thermocouples convert heat energy into

6. Reciprocal of resistivity is called

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

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

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

10. The resistively ρ of Tungoston in Ωm is

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

12. In a voltmeter the conduction takes place due to

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

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

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

16. Current provided by a battery is maximum when

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

18. 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

19. Specific resistance of a wire depends upon

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

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

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

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

24. The graphical representation of Ohms law is

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

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

27. 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?

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

29. Internal resistance is the resistance offered by

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

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

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

33. Ohm’s law describes the mathematical relationship between

34. The resistivity of constant on is Ω m is

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

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

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

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

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

40. Resistively depends upon the resistance of the material of

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

42. If voltage across a resistance doubles

43. Thermocouple is an arrangement of two different metals

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

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

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

47. Electrical power dissipation in resistors is given by

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

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

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

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

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

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

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

 

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

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

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

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

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

60. The passage of an electric current produces

61. Kirchhoff’s first rule is also known as

62. Resistance of a conductor depends upon

63. 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

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

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

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

67. The conductivity of a superconductor is

68. The unit of conductance of a material is

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

70. 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

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

72. Heat energy dissipated in resistors is defined as:

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

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

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

76. The resistivity ρ of copper in Ω m is

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

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

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

80. Potentiometer is more sensitive than voltmeter, because

81. The thermistors are usually made of

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

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

84. 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?

85. 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

86. Photovoltaic cell converts:

87. The strength of an magnetic field depends upon the

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

89. The value of resistance depends upon

90. The resistivity of wire depends upon:

91. Thermocouples convert:

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

93. The colour coded carbon resistances are made by

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

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

96. Internal resistance is the resistance offered by

97. 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