MDCAT Physics Current Electricity Online Test

1. 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

2. In a voltmeter the conduction takes place due to

3. The conductivity of a superconductor is

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

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

6. The unit of conductance of a material is

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

8. If voltage across a resistance doubles

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

10. 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

11. 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?

12. Resistively depends upon the resistance of the material of

13. Photovoltaic cell converts:

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

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

16. Electrical power dissipation in resistors is given by

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

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

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

20. Thermocouple is an arrangement of two different metals

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

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

23. Internal resistance is the resistance offered by

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

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

26. Reciprocal of resistivity is called

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

28. The resistively ρ of Tungoston in Ωm is

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

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

31. The passage of an electric current produces

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

33. Thermocouples convert:

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

35. The colour coded carbon resistances are made by

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

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

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

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

40. 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

41. Resistance of a conductor depends upon

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

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

44. Specific resistance of a wire depends upon

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

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

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

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

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

50. 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

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

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

53. The value of resistance depends upon

54. Heat energy dissipated in resistors is defined as:

55. Current provided by a battery is maximum when

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

57. Potentiometer is more sensitive than voltmeter, because

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

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

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

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

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

63. The graphical representation of Ohms law is

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

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

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

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

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

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

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

71. The strength of an magnetic field depends upon the

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

73. Ohm’s law describes the mathematical relationship between

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

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

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

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

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

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

80. Kirchhoff’s first rule is also known as

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

82. The resistivity of constant on is Ω m is

83. 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

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

85. 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?

86. The resistivity ρ of copper in Ω m is

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

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

89. The thermistors are usually made of

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

91. Internal resistance is the resistance offered by

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

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

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

 

95. Thermocouples convert heat energy into

96. The wire used in rheostat, is made from

97. The resistivity of wire depends upon: