# 12th Class Physics Mcqs Chapter no 13 | Physics Mcqs For Class 12th Mcqs 2021 with answers pdf

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Chapter 13

CURRENT ELECTRICITY

Encircle the most appropriate answer among the following options

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

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

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)

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

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

(a) Electrons

(b) Atoms

(c) Protons

(d) Molecules

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

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

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

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

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

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

(a) Heat energy

(b) Nuclear energy

(c) Mechanical energy

(d) Chemical 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

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

(a) Ampere

(b) Coulomb

(c) Volt

(d) Ohm

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

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

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

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

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

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)

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

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

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

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

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

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

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

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

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

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

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)

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

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

(a) Liquids

(b) Solids

(c) Greases

(d) All

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

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

(a) Dilute solution of CuSO4

(b) Water

(c) Carbon

(d) CuSO4 in solid form

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

(a) Remains constant

(b) Decreased

(c) Increased

(d) None of these

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)

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

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

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

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

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

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

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

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

(a) Ohm

(b) Ampere

(c) Volt

(d) Joule

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

(a) Ohm-m

(b) Ohm-m2

(c) Ohm-m3

(d) Ohm

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

(a) Conductance

(b) Inductance

(c) Reactance

(d) Resistivity

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

(a) Conductivity

(b) Permitivity

(c) Resistance

(d) Voltage

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

(a) mho

(b) ohm

(c) mho-m-1

(d) None of above

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

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

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

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

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

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

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

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

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)

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

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

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

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

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

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

(a) Gold

(b) Silver

(c) Manganese

(d) Carbon

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

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

(a) Rods

(b) Washers

(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

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

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

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)

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

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

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

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

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

(a) Newton

(b) Joule

(c) Ampere

(d) J/c

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

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

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

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

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

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

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

(a) Electrode

(b) Cathode

(c) Anode

(d) Electrolyte

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

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

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

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

(a) Thermistor

(b) Variable resistor

(c) Fixed resistor

(d) None of these

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

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

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

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

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

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

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

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

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

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

(a) Gold

(b) Silver

(c) Copper

(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

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

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

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

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

(a) Copper

(b) Gold

(c) Silver

(d) Aluminum

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