# 12th Class Physics Chapter 13 MCQs with Answers

Welcome to the 12th Class Physics Chapter 13 MCQs  Online Test. We are presenting you with top MCQ questions from the 12th Class Physics Chapter CURRENT ELECTRICITY.

The 12th Class Physics Chapter “Current Electricity” delves into the captivating realm of electric currents and the principles governing their behavior. This chapter serves as a crucial foundation for understanding the flow of electric charge in circuits and the various phenomena associated with current electricity.

## 12th Class Physics Chapter 13 MCQs with Answers

The chapter begins by introducing the concept of electric current, which represents the flow of electric charge through a conductor. Students will explore the relationship between current, charge, and time, and learn to calculate the magnitude and direction of electric currents in different scenarios.

The chapter further explores Ohm’s law, a fundamental principle in current electricity. Students will understand the relationship between voltage, current, and resistance, and apply this knowledge to calculate the resistance of conductors and solve circuit problems.

To deepen their understanding, students will explore the behavior of resistors, both individually and in series and parallel combinations. They will learn about the principles of resistivity, conductance, and the factors affecting the resistance of a material.

The chapter also covers the concept of electrical power and energy in circuits. Students will explore the relationship between power, voltage, and current, and learn to calculate power consumption and energy transfer in electrical systems.

To reinforce their learning, the chapter may include practical examples, circuit diagrams, and numerical exercises. Students will develop problem-solving skills and the ability to analyze complex circuits using Kirchhoff’s laws and other relevant techniques.

Additionally, the chapter may introduce important devices and components used in current electricity, such as batteries, capacitors, and electrical measuring instruments. Students will understand their working principles and their significance in various applications.

The study of “Current Electricity” in the 12th Class Physics curriculum equips students with a solid foundation in understanding electric currents, circuit analysis, and electrical power. It prepares them for more advanced topics in electronics, electrical engineering, and related fields. Furthermore, it cultivates critical thinking skills and the ability to apply scientific principles to real-world situations, fostering a deeper appreciation for the role of electricity in our modern society.

### MCQs Class 12 Physics with Answers

The purpose of these online MCQs tests is to help you evaluate your 12th Class Physics Chapter 13 MCQs. These Multiple Choice Questions (MCQs) will prepare you for your academic success in the 12th Class Exams. 12th Class Physics Chapters include Chapter 12 Electrostatics, Chapter 13 Current Electricity, Chapter 14 Electromagnetism, Chapter 15 Electromagnetic Induction, Chapter 16 Alternating Current, Chapter 17 Physics of Solids, Chapter 18 Electronics, Chapter 19 Dawn of Modern Physics, Chapter 20 Atomic Spectra and Chapter 21 Nuclear Physics.

### What is CURRENT ELECTRICITY?

Electric current is the flow of electrons through a complete circuit of conductors. It is used to power everything from our lights to our trains. In these activities, students will explore different kinds of circuits and investigate what is required to make a complete circuit.

Chapter 13 CURRENT ELECTRICITY

1. In liquids and gases, the current is due to the motion of which among the following:

(a) Negative charges

(b) Neutral particle

(c) Positive charges

(d) Both negative and positive charges

(d) Both negative and positive charges

2. The charge carriers in metallic conductors are one of the following:

(a) Free electrons and ions

(b) Electrons

(c) Electrons and protons

(d) +ve and —ve ions

(a) Free electrons and ions

3. The conventional current is due to the flow of which among following:

(a) Atoms and molecules

(b) Positive charge

(c) Negative charge

(d) Both (b) and (c)

(b) Positive charge

4. The electronics current is due to the flow of which among the following:

(a) Positive charge

(b) Negative ions

(c) Positive ions

(d) Negative charge

(b) Negative ions

5. An electric current in a wire involves the movement of which among the following:

(a) Electrons

(b) Atoms

(c) Protons

(d) Molecules

(a) Electrons

6. When electric current passes through the conductors, it increases which among the following:

(a) P.E of the atoms

(b) K.E of the atoms

(c) Atomic size

(d) Number of protons

(b) K.E of the atoms

7. When a pot difference of 4 volt is applied across resistance, 10 J of energy is converted. Find charge flows among the following options:

(a) 0.20 c

(b) 2.5 c

(c) 5.0 c

(d) 10.0 c

(b) 2.5 c

8. The motion of free electrons inside the metallic conductors is one of the following:

(a) Circular motion

(b) Linear motion

(c) Random motion

(d) None of above

(b) Linear motion

9. The net charge flowing across the cross-sectional area per unit time will be known as one of the following:

(a) Electric flows

(b) Electric current

(c) Pot difference

(d) Ampere

(b) Electric current

10. Electric heater is the effect of electric current choose right option choose which one is correct:

(a) Heating effect

(b) Chemical effect

(c) Magnetic effect

(d) None of above

(a) Heating effect

11. Thermo-couple convert into electrical energy choose one.

(a) Heat energy

(b) Nuclear energy

(c) Mechanical energy

(d) Chemical energy

(a) Heat energy

12. If the source of emf is traversed from negative to positive terminal, what will be the potential change choose which one is correct:

(a) Positive

(b) Negative

(c) Consult

(d) Zero

(a) Positive

13. What will be the SI unit of electric current choose which one is correct:

(a) Ampere

(b) Coulomb

(c) Volt

(d) Ohm

(a) Ampere

14. At constant temp, the current flowing through a conductor is directly proportional to the potential difference across its ends will be known as choose which one is correct:

(a) Charles law

(b) Amperes law

(c) Coulombs law

(d) Ohm’s law

(d) Ohm’s law

15. Which is the Most practical applications of electricity choose which one is correct:

(a) Molecules in motion

(b) Electrons at rest

(c) Charge in motion

(d) Atoms in notion

(c) Charge in motion

16. The conventional current is the name given to current due to flow of one among the following choose which one is correct:

(a) Positive charges

(b) Negative charges

(c) Both (a) and (b)

(d) None of these

(a) Positive charges

17. A current of I ampere is passing through a conductor, what will be the charge passing through it in one minute is choose which one is correct:

(a) 40 coulomb

(b) 60 coulomb

(c) 2 coulomb

(d) None of these

(b) 60 coulomb

18. The magnitude of the drift velocity is of the order of one among the following choose which one is correct:

(a) 10-3 m/s

(b) 10-4 m/s

(c) 10-6 m/s

(d) 103 m/s

(a) 10-3 m/s

19. Drift velocity is used when the ends of a wire are choose which one is correct:

(a) Connected to a voltage source

(b) Not connected to voltage source

(c) At different values of potential

(d) Both (a) and (c)

(d) Both (a) and (c)

20. If the source of emf traversed from positive to negative terminals, the potential change are choose which one is correct:

(a) Negative

(b) Constant

(c) Zero

(d) Positive

(a) Negative

21. When same current passes for same time through a thick and thin wire choose which one is correct:

(a) No heat is produced in wire

(b) More heat is produced in thin wire

(c) More heat is produced in thick wire

(d) None of these

(c) More heat is produced in thick wire

22. The average velocity gained by electrons in a conductor placed in electric field is called choose which one is correct:

(a) Variable velocity

(b) Uniform velocity

(c) Drift velocity

(d) Instantaneous velocity

(c) Drift velocity

23. A wire having very high value of conductance is said to be choose which one is correct:

(a) Very good conductor

(b) An insulator

(c) Moderately good conductor

(d) None of liens

(a) Very good conductor

24. The effects of bends in a wire on its electrical resistance are choose which one is correct:

(a) Zero

(b) Larger

(c) Smaller

(d) None of these

(a) Zero

25. An electric field is generated along the wire when choose which one is correct:

(a) A constant potential is maintained across the wire

(b) Net current is zero

(c) A constant potential difference is maintained across the wire

(d) None of these

(c) A constant potential difference is maintained across the wire

26. In order to have a constant current through a wire, the potential difference across its ends should be choose which one is correct:

(a) Increasing

(b) Decreasing

(c) Zero

(d) Maintained constant

(d) Maintained constant

27. When two spherical conducting balls at different potentials are joined by metallic wire, after some time, potential difference will be choose which one is correct:

(a) Same

(b) Zero

(c) Different

(d) None of these

(a) Same

28. Conversion of chemical energy into electrical energy can be achieved by choose which one is correct:

(a) Solar cell

(b) Photo voltaic cell

(c) Dry cell

(d) None of these

(c) Dry cell

29. The device, which converts heat energy into electrical energy is called choose which one is correct:

(a) Thermo couple

(b) Photo voltaic cell

(c) Thermistor

(d) Thermostat

(a) Thermo couple

30. Heating effect of current is used in choose which one is correct:

(a) Electric Kittle

(b) Electric motor

(c) Electric taster

(d) Both (a) and (c)

(d) Both (a) and (c)

31. Magnetic effect of current is used choose which one is correct:

(a) To detect a current

(b) To measure a current

(c) In electric motor

(d) All

(d) All

32. Electrolysis is the study of conduction of electricity through choose which one is correct:

(a) Liquids

(b) Solids

(c) Greases

(d) All

X(a) Liquids

33, The vessel containing the two electrodes and certain liquid is known choose which one is correct:

(a) Electrolyte

(b) Thermometer

(c) Voltameter

(d) None of these

(c) Voltameter

34. The voltameter usually contains choose which one is correct:

(a) Dilute solution of CuSO4

(b) Water

(c) Carbon

(d) CuSO4 in solid form

(a) Dilute solution of CuSO4

35. During electrolysis process, density of CuS04 solution choose which one is correct:

(a) Remains constant

(b) Decreased

(c) Increased

(d) None of these

(a) Remains constant

36. The magnitude of magnetic effects depends upon choose which one is correct:

(a) Quality of electricity passed through the liquid

(b) Colour of the liquid

(c) Nature of the liquid

(d) Both (a) and (c)

(d) Both (a) and (c)

37. If the resistor is traversed in the direction of current, the potential change are choose which one is correct:

(a) Negative

(b) Zero

(c) Constant

(d) Positive

(a) Negative

38. The conductors which obey Ohm’s law are called choose which one is correct:

(a) Super conductors

(b) Semi-conductors

(c) Ohmic

(d) Non-ohmic

(c) Ohmic

39. The conductors which do not obey Ohm’s law are called choose which one is correct:

(a) Non-Ohmic

(b) Ohmic

(c) Super conductors

(d) Semi-conductors

(a) Non-Ohmic

40. For ohmic devices, the graph between V and I is choose which one is correct:

(a) A curve

(b) A straight line

(c) Parabola

(d) None of above

(b) A straight line

41. For non-ohmic devices, the graph between V and I is choose which one is correct:

(a) Not a straight line

(b) A straight line

(c) A curve

(d) All of above

(a) Not a straight line

42. When the Wheatstone bridge is balanced, the galvanometer shows zero deflection because choose which one is correct:

(a) Both the terminals of galvanometer are at the same potential

(b) Both terminals of the galvanometer have maximum potential

(c) The resistance of galvanometer becomes zero

(d) The resistance of galvanometer becomes maximum

(a) Both the terminals of galvanometer are at the same potential

43. The resistance on a one metre cube of a conductor is called choose which one is correct:

(a) Resistivity

(b) Inductivity

(c) Permitivity

(d) Conductivity

(a) Resistivity

44. The SI unit of resistance is choose which one is correct:

(a) Ohm

(b) Ampere

(c) Volt

(d) Joule

(a) Ohm

45. The SI unit of resistivity is choose which one is correct:

(a) Ohm-m

(b) Ohm-m2

(c) Ohm-m3

(d) Ohm

(a) Ohm-m

46. The reciprocal of a resistance is called choose which one is correct:

(a) Conductance

(b) Inductance

(c) Reactance

(d) Resistivity

(a) Conductance

47. The reciprocal of resistivity is choose which one is correct:

(a) Conductivity

(b) Permitivity

(c) Resistance

(d) Voltage

(a) Conductivity

48. The SI unit of conductance is choose which one is correct:

(a) mho

(b) ohm

(c) mho-m-1

(d) None of above

(a) mho

49. If the resistivity of the conductor is large then it is choose which one is correct:

(a) An insulator

(b) A poor conductor

(c) A good conductor

(d) A conductor

(b) A poor conductor

50. If the resistivity of the conductor is small then it is choose which one is correct:

(a) Good conductor

(b) Conductor

(c) Insulator

(d) Poor conductor

(b) Conductor

51. The study of conductance of Electricity through liquids is known as choose which one is correct:

(a) Electrolysis

(b) Resistivity

(c) Conductivity

(d) None of above

(a) Electrolysis

52. Conductance is choose which one is correct:

(a) Reciprocal of resistance

(b) Measured in mho

(c) Another name of resistance

(d) All of above

(a) Reciprocal of resistance

53. The value of the resistivity is the least for choose which one is correct:

(a) Silver

(b) Aluminium

(c) Copper

(d) All of above

(b) Aluminium

54. Wheat stone bridge is an arrangement consisting of choose which one is correct:

(a) Four resistances

(b) Three resistances

(c) Five resistances

(d) None of above

(a) Four resistances

55. Colour code carbon resistance consist of choose which one is correct:

(a) Four bands read from left to right

(b) Three bands read from left to right

(c) Four bands read from right to left

(d) None of these

(a) Four bands read from left to right

56. The third band of the colour code choose which one is correct:

(a) Gives the third digit

(b) Gives the number of zeros

(c) Give the tolerance

(d) None of these

(b) Gives the number of zeros

57. The fourth band is a choose which one is correct:

(a) Gold band

(b) Silver band

(c) Brown band

(d) Both (a) and (b)

(d) Both (a) and (b)

58. When ever current is drawn from the battery, its emf and terminal potential difference became choose which one is correct:

(a) Equal

(b) Different

(c) Zero

(d) Negative

(a) Equal

59. A complex system consisting of a many resistances can be solved by choose which one is correct:

(b) Ohm’s law

(c) Kirchhoff rules

(d) Ampere’s law

(c) Kirchhoff rules

60. Kirchoff first rule is also called the law of conservation of choose which one is correct:

(a) Momentum

(b) Mass

(c) Energy

(d) Charge

(d) Charge

61. The wire used in the construction of a rheostat is of the material choose which one is correct:

(a) Iron

(b) Silver

(c) Gold

(d) Manganin

(d) Manganin

62. To use a rheostat as variable resistor, the terminals which are inserted in a circuit are choose which one is correct:

(a) Fixed terminal A and sliding contact C

(b) Both fixed terminals A and B

(c) Fixed terminal B and sliding contact C

(d) All of above

(a) Fixed terminal A and sliding contact C

63. Thermistors are made from mixtures of metallic oxides of choose which one is correct:

(a) Gold

(b) Silver

(c) Manganese

(d) Carbon

(c) Manganese

64. Thermistors are prepared under choose which one is correct:

(a) High pressure and high temperature

(b) High pressure and low temperature

(c) Low pressure and low temperature

(d) None of these

(a) High pressure and high temperature

65. Thermistors may be in the form of choose which one is correct:

(a) Rods

(b) Washers

(d) Either of these

(d) Either of these

66. If one end of the fixed terminals and sliding contact of a rheostat are connected in a circuit, it is to be used as choose which one is correct:

(a) Variable resistor

(b) Power supply

(c) Potential divider

(d) None of above

(a) Variable resistor

67. In the construction of a rheostat, we use manganin which is an alloy of choose which one is correct:

(a) Cu, Ag and Fe

(b) Fe and Ni

(c) Cu, Au and Fe

(d) Cu, Ni, Fe and Mn

(d) Cu, Ni, Fe and Mn

68. Algebraic sum of currents meeting at a point is zero according to choose which one is correct:

(b) Ampere’s law

(c) Kirchhoff first rule

(d) None of above

(c) Kirchhoff first rule

69. When the current is being drawn from the battery choose which one is correct:

(a) V = E + Ir is applied

(b) V = E — Ir is applied

(c) It is being discharged

(d) Both (a) and (c)

(d) Both (a) and (c)

70. When the current is drawn from a cell, its terminal potential difference and emf are:

(a) Different

(b) Same

(c) Both zero

(d) None of them

(a) Different

71. The resistance present between the two electrodes of the cell is due to:

(a) Connecting wires

(b) An electrolyte present between them

(c) Electrodes themselves

(d) None of these

(b) An electrolyte present between them

72. When a battery is being charged, its terminal potential difference is choose which one is correct:

(a) Less than its emf

(b) Greater than its emf

(c) Equal to emf

(d) None of these

(b) Greater than its emf

73. The loss of electrical energy per second is called choose which one is correct:

(a) Power dissipation

(b) Energy dissipation

(c) Work

(d) None of these

(a) Power dissipation

74. The unit of emf is choose which one is correct:

(a) Newton

(b) Joule

(c) Ampere

(d) J/c

(c) Ampere

75. The quantity having the same unit as that of emf is choose which one is correct:

(a) Energy

(b) Momentum

(c) Potential difference

(d) Current

(c) Potential difference

76. Kirchhoff’s first rule is a manifestation of law of enervation of choose which one is correct:

(a) Charge

(b) Mass

(c) Energy

(d) None of these

(a) Charge

77. Kirchhoff’s second rule is a manifestation of law of conservation of choose which one is correct:

(a) Charge

(b) Mass

(c) Energy

(d) None of these

(c) Energy

78. A voltmeter can read the correct potential difference only when the current drawn by it from the cell is choose which one is correct:

(a) Smaller

(b) Greater

(c) Zero

(d) None of these

(c) Zero

79. If both fixed as well as the sliding contact of a rheostat are connected in a circuit, it is to be used as choose which one is correct:

(a) Variable resistor

(b) Power supply

(c) Potential divider

(d) None of above

(c) Potential divider

80. The electrode connected with positive terminal of battery is called choose which one is correct:

80. The electrode connected with positive terminal of battery is called choose which one is correct:

(a) Anode

(b) Cathode

(c) Electrode

(d) Electrolyte

(a) Anode

81. The electrode connected with negative terminal of battery is called choose which one is correct:

(a) Electrode

(b) Cathode

(c) Anode

(d) Electrolyte

(b) Cathode

82. The resistance of a conductor through which a current Of one ampere is flowing when a potential difference across its ends is one volt is choose which one is correct:

(a) One volt

(b) One ohm

(c) One ampere

(d) One coulomb

(b) One ohm

83. The resistance of a conductor depends upon choose which one is correct:

(a) Pot difference between its ends

(b) The nature of material

(c) Dimension

(d) The nature, dimension and physical state of conductor

(d) The nature, dimension and physical state of conductor

84. If the resistance of the conductor is increased, the current will choose which one is correct:

(a) Remains the same

(b) Increase

(c) Decrease

(d) None of above

(c) Decrease

85. A heat sensitive resistor is called choose which one is correct:

(a) Thermistor

(b) Variable resistor

(c) Fixed resistor

(d) None of these

(a) Thermistor

86. A device which is a wire wound resistance called choose which one is correct:

(a) Rheostat

(b) Solenoid

(c) Inductor

(d) None of above

(a) Rheostat

87. The resistance of the conductor does not depend upon its choose which one is correct:

(a) Mass

(b) Length

(c) Cross-sectional area

(d) Resistivity

(a) Mass

88. When the temperature of a conductor is raised, its resistance choose which one is correct:

(a) Remains the same

(b) Always increase

(c) Always decrease

(d) None of these

(b) Always increase

89. The resistance of the conductor increase with the increase in its choose which one is correct:

(a) Cross-sectional area

(b) Length

(c) Diameter

(d) None of these

(b) Length

90. The resistance of the conductor increases due to rise of temp of a conductor because collision cross-section of the atoms choose which one is correct:

(a) Remain, unchanged

(b) Decreases

(c) Increases

(d) None of above

(c) Increases

91. Non-ohmic devices are choose which one is correct:

(a) Filament of a bulb

(b) Semiconductor diode

(c) Both (a) and (b)

(d) None of above

(c) Both (a) and (b)

92. In series circuit, the pot difference across each resistance is choose which one is correct:

(a) Different

(b) Same

(c) Variable

(d) None of these

(a) Different

93. In parallel circuit, the current has choose which one is correct:

(a) Many paths

(b) Two paths

(c) Three paths

(d) None of these

(a) Many paths

94. A rheostat can be used as variable resistor as well as a

(a) Potential divider

(b) Current divider

(c) Wheat stone bridge

(d) Power divider

(a) Potential divider

95. The resistivity of decrease with the increase in temp.

(a) Gold

(b) Silver

(c) Copper

(d) Silicon

(d) Silicon

96. The Fractional change in resistivity per unit original resistivity per Kelvin in temperature is known as choose which one is correct:

(a) Temperature coefficient of resistance

(b) Temperature coefficient of resistivity

(c) Temperature coefficient of conductivity

(d) None of these

(b) Temperature coefficient of resistivity

97. The SI unit of the temp coefficient of resistivity of a material is choose which one is correct:

(a) K

(b) K-1

(c) Ohm K

(d) Ohm

(b) K-1

98. New prepared ceramic material have been found to be super conductor even at choose which one is correct:

(a) T=125K

(b) T=50K

(c) T=130K

(d) T=75K

(a) T=125K

99. Three resistors of resistance 2, 3 and 6 Ohms are connected in parallel then their equivalent resistance is choose which one is correct:

(a) 11.0 ohms

(b) I .0 ohm

(c) 5.0 ohms

(d) 70 ohms

(b) I .0 ohm

100. Which one is the best conductor choose which one is correct:

(a) Copper

(b) Gold

(c) Silver

(d) Aluminum

(c) Silver

101. Resistance and resistivity of a substance choose which one is correct:

(a) Decrease in rise of temperature

(b) Increase with rise of temperature

(c) Remains same at every temperature

(d) None of above