ECAT Physics Current Electricity Online Test

1. Kirchhoff’s first rule is also known as

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

3. 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

4. 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

5. 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?

6. The resistivity of wire depends upon:

7. The unit of conductance of a material is

8. Thermocouples convert heat energy into

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

10. The graphical representation of Ohms law is

11. Internal resistance is the resistance offered by

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

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

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

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

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

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

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

19. The wire used in rheostat, is made from

20. 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

21. Photovoltaic cell converts:

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

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

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

25. Reciprocal of resistivity is called

26. Ohm’s law describes the mathematical relationship between

27. If voltage across a resistance doubles

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

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

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

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

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

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

34. The thermistors are usually made of

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

36. 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

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

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

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

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

41. Thermocouple is an arrangement of two different metals

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

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

44. Resistively depends upon the resistance of the material of

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

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

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

48. Thermocouples convert:

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

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

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

52. The conductivity of a superconductor is

53. Electrical power dissipation in resistors is given by

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

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

 

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

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

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

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

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

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

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

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

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

65. The value of resistance depends upon

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

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

68. Current provided by a battery is maximum when

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

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

71. Heat energy dissipated in resistors is defined as:

72. The colour coded carbon resistances are made by

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

74. Specific resistance of a wire depends upon

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

76. Potentiometer is more sensitive than voltmeter, because

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

78. 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

79. The strength of an magnetic field depends upon the

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

81. The passage of an electric current produces

82. Resistance of a conductor depends upon

83. The resistivity of constant on is Ω m is

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

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

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

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

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

89. The resistively ρ of Tungoston in Ωm is

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

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

92. In a voltmeter the conduction takes place due to

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

94. Internal resistance is the resistance offered by

95. The resistivity ρ of copper in Ω m is

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

97. 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?