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Physics Current Electricity Online Mcqs Test

Malik TahirLast Updated: October 13, 2025

Important Physics Current Electricity Question and Answer

Total Questions:	97
Time Allowed:	35 Minutes
Total Marks:	97
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Physics Current Electricity Practice Test Online With Explanation

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Page 1 of 4

1. Resistively depends upon the resistance of the material of

Meter

None of these

(meter)³

(meter)²

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

An insulator

No specific criterion available

Moderately good conductor

Very good conductor

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

Current

Repulsion of charges

None of these

Attraction of charges

4. The conductivity of a superconductor is

Very small

Infinite

Zero

Very large

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

Iron

Copper

Silver

Tungsten

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

None of these

Ohmic device

Neither Ohmic nor non Ohmic

Non-ohmaic device

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

No heat is produced in wire

More heat is produced in thin wire

Less heat is produced in thick wire

More heat is produced in thick wire

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

Solar energy

Heat

Light

None of these

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

6 A

11/3 A

3/11 A

3 A

10. The resistivity of wire depends upon:

Its area of cross section

Its shape

Its length

Its material

11. The value of resistance depends upon

Dimension

All of them

Nature

Physical state

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

10¯⁵ ms¯¹

10¯⁶ ms¯¹

10¯³ ms¯¹

10¯⁴ ms¯¹

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

0.5 A

1.2 A

2 A

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

Length

Diameter

Cross-sectional area

Both diameter and cross-sectional area

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

4 R

2 R

16 R

6 R

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

One farad

One coulomb

One ampere

One ohm

17. 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

0.8 Ω

0.9 Ω

0.1 Ω

0.7 Ω

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

Not enough information

Stay the same

Decrease

Increase

19. The wire used in rheostat, is made from

Nichrome

Tungston

Maganin

Constantan

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

Protons

Still under controversy

Neutrons

Free electrons

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

2 amperes

1 ampere

0.5 amperes

Zero amperes

22. 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

10 Ω

0.10 Ω

1 Ω

Zero

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

It decreases by a factor of five

Not enough information

It stays the same

It increases by a factor of five

24. If voltage across a resistance doubles

None of these

The current is halved

The resistance doubles

The current is unchanged

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

1 ohm

2 ohms

3 ohms

0.1 ohm

Page 2 of 4

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

9.1 K Ω

5.6 K Ω

3.3 K Ω

2.2 K Ω

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

Heating effect

Chemical effect

Magnetic effect

None of these

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

200 W

302.5 W

250 W

350 W

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

Inter-electron collisions

Collisions of conduction electrons with atoms

Inter-atomic collisions

Fall of electrons from higher orbits to lower orbits

30. Electrical power dissipation in resistors is given by

Q ∆V/∆t

V ∆Q/∆t

∆W/∆Q x V

V/Q x ∆t

31. Thermocouple is an arrangement of two different metals

To convert heat energy into chemical energy

To produce more heat

To convert heat energy in to electrical energy

To convert electric energy in to heat energy

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

Minimum current flows through the galvanometer branch

Potential difference across galvanometer branch is zero

Potential difference across galvanometer branch is maximum

Maximum current flows through the galvanometer branch

33. Internal resistance is the resistance offered by

The circuit

The resistor

The conductor

Source of emf

34. Specific resistance of a wire depends upon

Cross-section area

None of these

Length

Mass

35. Thermocouples convert heat energy into

Chemical energy

None of these

Electrical energy

Mechanical energy

36. Internal resistance is the resistance offered by

Resistor

Source of e m f

Conductor

Capacitor

37. The resistively ρ of Tungoston in Ωm is

4.00 x 10¯⁸

None of these

5.00 x 10¯⁸

4.8 x 10¯⁸

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

Its internal resistance is maximum

Its internal resistance is minimum

The circuit is open

The circuit is closed

39. 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

3 volt

15 volt

5 volt

9 volt

40. Thermocouples convert:

Kinetic energy into potential energy

Light energy into electrical energy

Electrical energy into heat energy

Heat energy into electrical energy

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

12 x 10³ ± 5%

23 x 10¹ ± 10%

21 x 10³ ± 10%

21 x 10³ ± 5%

42. 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

112 V

118 V

110 V

100 V

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

0.8 g

108 g

108/0.8 g

10.8 g

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

Same

Different

None of these

Greater than highest resistance

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

10,000 V

0.04 V

2.5 V

25.0 V

46. Kirchhoff’s first rule is also known as

Law of conservation of charge

All of them

Kirchhoff’s point rule

Kirchhoff’s current rule

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

80 W

100 W

64 W

125 W

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

Flow of neutron

Flow of positive charge

Flow of negative charge

None of these

49. The colour coded carbon resistances are made by

Ceramic rod

All of these

Low grade ceramic rod

High grade ceramic rod

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

2 r

r / 4

r / 2

4 r

Page 3 of 4

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

Positive charges

Negative charges

None of these

Both positive and negative charges

52. Current provided by a battery is maximum when

Internal resistance is less then external resistance

None of these

Internal resistance is greater than external resistance

Internal resistance equal to external resistance

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

None of these

Coulomb

Ampere

Volt

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

Greater than the greatest resistance in series

Less than the largest resistance in series

Equal to the greatest resistance in series

Less than the smallest resistance in series

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

Joule effect

Comptons effect

Joule Thomsons effect

Feed back effect

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

Alloy

Semiconductor

Insulator

Conductor

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

Atoms

All of these

Lattice

Electrons

58. The graphical representation of Ohms law is

Ellipse

Hyperbola

Straight line

Parabola

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

30 V

0 V

90 V

60 V

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

15 KJ

15 K

10 K

20 K

61. Ohm’s law describes the mathematical relationship between

Ohms, kilohms, and megohms

None of these above

Resistor size and resistor value

Resistance, voltage, and current

62. Reciprocal of resistivity is called

Flexibility

Conductivity

Resistance

Inductance

63. The resistivity ρ of copper in Ω m is

1.52 x 10¯⁸

1.56 x 10¯⁸

1.54 x 10¯⁸

None of these

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

Always increases

May increase or decrease

Remains the same

Always decreases

65. Heat energy dissipated in resistors is defined as:

Both a and b

l²Rt

Vlt

None of these

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

20 A

15 A

5 A

8 A

67. 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

10 watt

1 watt

100 watt

0.1 watt

68. 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?

16 V

18 V

15 V

17 V

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

Changing resistivity

Decreasing the length

None of these

Increasing the area

70. Resistance of a conductor depends upon

All of above

Dimension of conductor

Physical state of the conductor

Nature of conductor

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

Collisions of free electrons with one another

High resistance value

High drift speed of free electrons

Collisions of free electrons with atoms or ions of conductor

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

± 10%

None of these

± 5%

± 20%

73. In a voltmeter the conduction takes place due to

Electrons only

Electrons and holes

Electrons and ions

Holes only

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

R₁ = 4R₂

R₁ = 2R₂

R₂ = 4R₁

R₂ = 2R₁

75. The thermistors are usually made of

Metal oxides with high temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

Metals with low temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Page 4 of 4

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

Result

Relation

Effect

None of these

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

Zero

1.1 Ω

0.5 Ω

5.0 Ω

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

Solar energy

Chemical energy

Mechanical energy

All of these

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

12 Ω

1.5 Ω

6.0 Ω

3.0 Ω

80. Photovoltaic cell converts:

Heat energy into electrical energy

Chemical energy into electrical energy

None of these

Light energy into electrical energy

81. The resistivity of constant on is Ω m is

None of these

49 x 10¯⁸

50 x 10¯⁸

10 x 10¯⁸

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

The internal resistance of battery is zero

The battery is charged

The internal resistance of battery is infinite

The battery is discharged

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

Half of the original one

Same as original one

Double of the original one

One-fourth of the original one

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

600 volts

800 volts

500 volts

700 volts

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

20 V

10 V

12 V

16 V

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

P = I/V²

P = R/V²

P = V/I

P = V²/R

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

810 W

1210 W

670 W

1310 W

88. 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?

1.6 x 10¹⁹

0.625 x 10¹²

1.6 x 10¯¹⁹

0.625 x 10¹⁹

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

Is halved

Is doubled

Becomes zero

Remains the same

90. The passage of an electric current produces

Heating effect

Magnetic effect

Chemical effect

All of these

91. The unit of conductance of a material is

mho

All of these

Siemen

Ohm

92. Potentiometer is more sensitive than voltmeter, because

Voltmeter has a very high resistance

Voltmeter has a very low resistance

Potentiometer does not draw any current from a source of unknown potential difference

Potentiometer is sensitive

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

Neutral

Positive

Negative

Positive and negative

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

Different current but same potential difference

Same current and potential difference

Difference current and different potential difference

Same current

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

Specific resistance

Effective resistance

Conductance

Current

96. The strength of an magnetic field depends upon the

Value of current

Distance from the source

None of these

A and B

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

The resistor value increased

It is impossible to determine the change in the resistor value

The resistor value decreased

The resistor value did not change

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Malik TahirLast Updated: October 13, 2025

Physics Current Electricity Online Mcqs Test

Important Physics Current Electricity Question and Answer

Physics Current Electricity Practice Test Online With Explanation

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Malik Tahir

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