ECAT Physics Current Electricity Online Test

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

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

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

4. Ohm’s law describes the mathematical relationship between

5. Resistively depends upon the resistance of the material of

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

7. Reciprocal of resistivity is called

8. The resistivity of wire depends upon:

9. Heat energy dissipated in resistors is defined as:

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

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

12. Internal resistance is the resistance offered by

13. Potentiometer is more sensitive than voltmeter, because

14. The value of resistance depends upon

15. Kirchhoff’s first rule is also known as

16. Internal resistance is the resistance offered by

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

18. The resistivity ρ of copper in Ω m is

19. 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

20. Resistance of a conductor depends upon

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

22. 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

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

24. Current provided by a battery is maximum when

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

26. Photovoltaic cell converts:

27. The strength of an magnetic field depends upon the

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

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

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

31. The graphical representation of Ohms law is

32. The unit of conductance of a material is

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

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

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

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

37. The resistively ρ of Tungoston in Ωm is

38. Electrical power dissipation in resistors is given by

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

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

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

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

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

44. 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

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

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

47. In a voltmeter the conduction takes place due to

48. 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

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

50. The passage of an electric current produces

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

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

 

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

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

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

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

57. The conductivity of a superconductor is

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

59. 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

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

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

62. The colour coded carbon resistances are made by

63. Specific resistance of a wire depends upon

64. The resistivity of constant on is Ω m is

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

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

67. 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?

68. The thermistors are usually made of

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

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

71. Thermocouples convert:

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

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

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

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

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

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

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

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

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

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

82. The wire used in rheostat, is made from

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

84. If voltage across a resistance doubles

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

86. 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?

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

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

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

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

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

92. Thermocouple is an arrangement of two different metals

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

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

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

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

97. Thermocouples convert heat energy into