MDCAT Physics Current Electricity Online Test

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

2. The strength of an magnetic field depends upon the

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

4. 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?

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

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

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

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

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

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

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

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

13. Reciprocal of resistivity is called

14. Current provided by a battery is maximum when

15. The colour coded carbon resistances are made by

16. Internal resistance is the resistance offered by

17. The value of resistance depends upon

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

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

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

21. The unit of conductance of a material is

22. Photovoltaic cell converts:

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

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

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

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

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

28. Resistance of a conductor depends upon

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

 

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

31. 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

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

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

34. Thermocouple is an arrangement of two different metals

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

36. Thermocouples convert:

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

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

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

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

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

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

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

44. Kirchhoff’s first rule is also known as

45. If voltage across a resistance doubles

46. The resistivity of wire depends upon:

47. Specific resistance of a wire depends upon

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

49. Resistively depends upon the resistance of the material of

50. The thermistors are usually made of

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

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

53. Internal resistance is the resistance offered by

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

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

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

57. In a voltmeter the conduction takes place due to

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

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

60. Electrical power dissipation in resistors is given by

61. The passage of an electric current produces

62. The resistivity of constant on is Ω m is

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

64. 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

65. The resistively ρ of Tungoston in Ωm is

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

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

68. Ohm’s law describes the mathematical relationship between

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

70. 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

71. The resistivity ρ of copper in Ω m is

72. 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

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

74. Potentiometer is more sensitive than voltmeter, because

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

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

77. 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

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

79. The conductivity of a superconductor is

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

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

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

83. Heat energy dissipated in resistors is defined as:

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

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

87. Thermocouples convert heat energy into

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

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

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

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

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

93. The graphical representation of Ohms law is

94. The wire used in rheostat, is made from

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

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

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