Physics Current Electricity Online Mcqs Test

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

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

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

 

4. The unit of conductance of a material is

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

6. Reciprocal of resistivity is called

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

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

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

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

11. Thermocouples convert:

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

13. Thermocouple is an arrangement of two different metals

14. The resistivity ρ of copper in Ω m is

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

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

17. Two resistances of 2Ω and 3Ω connected in series are attached to a source of 20 V. The potential difference across 3Ω resistance 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. Specific resistance of a wire depends upon

20. Resistance of a conductor depends upon

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

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

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

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

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

26. The value of resistance depends upon

27. Kirchhoff’s first rule is also known as

28. Electrical power dissipation in resistors is given by

29. The resistivity of constant on is Ω m is

30. The passage of an electric current produces

31. Internal resistance is the resistance offered by

32. 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

33. Potentiometer is more sensitive than voltmeter, because

34. 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?

35. The graphical representation of Ohms law is

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

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

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

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

40. 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

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

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

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

44. Resistively depends upon the resistance of the material of

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

46. The strength of an magnetic field depends upon the

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

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

49. Ohm’s law describes the mathematical relationship between

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

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

52. The resistively ρ of Tungoston in Ωm is

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

54. Heat energy dissipated in resistors is defined as:

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

56. If voltage across a resistance doubles

57. 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

58. Thermocouples convert heat energy into

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

60. 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?

61. Current provided by a battery is maximum when

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

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

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

65. In a voltmeter the conduction takes place due to

66. The wire used in rheostat, is made from

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

68. The resistivity of wire depends upon:

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

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

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

72. The colour coded carbon resistances are made by

73. The thermistors are usually made of

74. Photovoltaic cell converts:

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

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

77. Internal resistance is the resistance offered by

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

79. 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

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

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

82. 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

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

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

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

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

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

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

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

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

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

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

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

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

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

96. The conductivity of a superconductor is

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