MDCAT Physics Current Electricity Online Test

1. Internal resistance is the resistance offered by

2. Photovoltaic cell converts:

3. Thermocouples convert:

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

5. 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

6. 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

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

8. Ohm’s law describes the mathematical relationship between

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

10. The colour coded carbon resistances are made by

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

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

13. The thermistors are usually made of

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

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

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

17. 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?

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

19. The wire used in rheostat, is made from

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

21. Potentiometer is more sensitive than voltmeter, because

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

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

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

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

26. The strength of an magnetic field depends upon the

27. The passage of an electric current produces

28. Thermocouple is an arrangement of two different metals

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

30. Internal resistance is the resistance offered by

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

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

33. Electrical power dissipation in resistors is given by

34. The conductivity of a superconductor is

35. Specific resistance of a wire depends upon

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

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

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. The resistively ρ of Tungoston in Ωm is

40. Resistively depends upon the resistance of the material of

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

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

43. 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

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

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

46. The resistivity of wire depends upon:

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

48. 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

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

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

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

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

53. Reciprocal of resistivity is called

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

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

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

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

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

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

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

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

 

62. Resistance of a conductor depends upon

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

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

65. The graphical representation of Ohms law is

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

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

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

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

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

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

72. The unit of conductance of a material is

73. The resistivity of constant on is Ω m is

74. Kirchhoff’s first rule is also known as

75. If voltage across a resistance doubles

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

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

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

79. The resistivity ρ of copper in Ω m is

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

81. 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

82. The value of resistance depends upon

83. In a voltmeter the conduction takes place due to

84. 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?

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

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

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

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

89. Current provided by a battery is maximum when

90. Thermocouples convert heat energy into

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

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

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

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

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

96. Heat energy dissipated in resistors is defined as:

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