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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
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Physics Current Electricity Practice Test Online With Explanation

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Page 1 of 4

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

20 K

15 K

10 K

15 KJ

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

Protons

Still under controversy

Free electrons

Neutrons

3. The passage of an electric current produces

Chemical effect

All of these

Magnetic effect

Heating effect

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

P = I/V²

P = V/I

P = R/V²

P = V²/R

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

10 V

16 V

12 V

20 V

6. The resistively ρ of Tungoston in Ωm is

4.00 x 10¯⁸

5.00 x 10¯⁸

None of these

4.8 x 10¯⁸

7. Internal resistance is the resistance offered by

Resistor

Source of e m f

Conductor

Capacitor

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

108/0.8 g

0.8 g

108 g

10.8 g

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

R₁ = 4R₂

R₂ = 4R₁

R₂ = 2R₁

R₁ = 2R₂

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

None of these

Ampere

Volt

Coulomb

11. The value of resistance depends upon

All of them

Dimension

Nature

Physical state

12. 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

0.9 Ω

0.8 Ω

0.7 Ω

0.1 Ω

13. The strength of an magnetic field depends upon the

Value of current

None of these

A and B

Distance from the source

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

Equal to the greatest resistance in series

Less than the smallest resistance in series

Greater than the greatest resistance in series

Less than the largest resistance in series

15. The resistivity ρ of copper in Ω m is

1.56 x 10¯⁸

1.52 x 10¯⁸

1.54 x 10¯⁸

None of these

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

Remains the same

May increase or decrease

Always decreases

Always increases

17. 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

Remains the same

Becomes zero

Is doubled

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

Heating effect

None of these

Magnetic effect

Chemical effect

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

1 ohm

3 ohms

2 ohms

0.1 ohm

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

It stays the same

It decreases by a factor of five

It increases by a factor of five

Not enough information

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

1.1 Ω

5.0 Ω

0.5 Ω

Zero

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

The internal resistance of battery is infinite

The internal resistance of battery is zero

The battery is discharged

The battery is charged

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

Zero amperes

0.5 amperes

1 ampere

2 amperes

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

Same current and potential difference

Different current but same potential difference

Same current

Difference current and different potential difference

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

5.6 K Ω

2.2 K Ω

3.3 K Ω

9.1 K Ω

Page 2 of 4

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

Chemical energy

Mechanical energy

Solar energy

All of these

27. Electrical power dissipation in resistors is given by

V/Q x ∆t

Q ∆V/∆t

∆W/∆Q x V

V ∆Q/∆t

28. The colour coded carbon resistances are made by

All of these

Ceramic rod

Low grade ceramic rod

High grade ceramic rod

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

Alloy

Insulator

Semiconductor

Conductor

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

One-fourth of the original one

Double of the original one

Half of the original one

Same as original one

31. Internal resistance is the resistance offered by

The circuit

The conductor

Source of emf

The resistor

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

10¯³ ms¯¹

10¯⁶ ms¯¹

10¯⁴ ms¯¹

10¯⁵ ms¯¹

33. Resistance of a conductor depends upon

Nature of conductor

Physical state of the conductor

Dimension of conductor

All of above

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

r / 4

2 r

4 r

r / 2

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

Potential difference across galvanometer branch is maximum

Maximum current flows through the galvanometer branch

Minimum current flows through the galvanometer branch

Potential difference across galvanometer branch is zero

36. Thermocouples convert:

Light energy into electrical energy

Heat energy into electrical energy

Electrical energy into heat energy

Kinetic energy into potential energy

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

6 A

3/11 A

3 A

11/3 A

38. Heat energy dissipated in resistors is defined as:

None of these

l²Rt

Vlt

Both a and b

39. The unit of conductance of a material is

All of these

Siemen

mho

Ohm

40. 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

6 R

16 R

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

No specific criterion available

An insulator

Very good conductor

Moderately good conductor

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

Stay the same

Increase

Not enough information

Decrease

43. Specific resistance of a wire depends upon

Mass

None of these

Cross-section area

Length

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

Feed back effect

Joule effect

Joule Thomsons effect

Comptons effect

45. Thermocouples convert heat energy into

Electrical energy

None of these

Mechanical energy

Chemical energy

46. The resistivity of constant on is Ω m is

49 x 10¯⁸

None of these

50 x 10¯⁸

10 x 10¯⁸

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

500 volts

800 volts

600 volts

700 volts

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

Greater than highest resistance

Same

Different

None of these

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

21 x 10³ ± 10%

23 x 10¹ ± 10%

12 x 10³ ± 5%

21 x 10³ ± 5%

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

Repulsion of charges

Attraction of charges

Current

None of these

Page 3 of 4

51. Kirchhoff’s first rule is also known as

Law of conservation of charge

Kirchhoff’s point rule

All of them

Kirchhoff’s current rule

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

The circuit is open

The circuit is closed

Its internal resistance is maximum

Its internal resistance is minimum

53. If voltage across a resistance doubles

The current is halved

None of these

The current is unchanged

The resistance doubles

54. Reciprocal of resistivity is called

Flexibility

Resistance

Inductance

Conductivity

55. 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

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

Solar energy

None of these

Heat

Light

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

12 Ω

6.0 Ω

1.5 Ω

3.0 Ω

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

64 W

125 W

80 W

100 W

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

Diameter

Both diameter and cross-sectional area

Length

Cross-sectional area

60. The conductivity of a superconductor is

Very small

Very large

Zero

Infinite

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

1210 W

670 W

1310 W

810 W

62. Current provided by a battery is maximum when

Internal resistance equal to external resistance

Internal resistance is less then external resistance

None of these

Internal resistance is greater than external resistance

63. Photovoltaic cell converts:

Chemical energy into electrical energy

Heat energy into electrical energy

Light energy into electrical energy

None of these

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

High resistance value

High drift speed of free electrons

Collisions of free electrons with one another

Collisions of free electrons with atoms or ions of conductor

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

0 V

30 V

60 V

90 V

66. In a voltmeter the conduction takes place due to

Electrons only

Electrons and ions

Electrons and holes

Holes only

67. Ohm’s law describes the mathematical relationship between

Ohms, kilohms, and megohms

Resistor size and resistor value

Resistance, voltage, and current

None of these above

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

Lattice

All of these

Atoms

Electrons

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

Current

Conductance

Specific resistance

Effective resistance

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

Relation

None of these

Result

Effect

71. Resistively depends upon the resistance of the material of

(meter)³

(meter)²

None of these

Meter

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

More heat is produced in thin wire

Less heat is produced in thick wire

No heat is produced in wire

More heat is produced in thick wire

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

± 20%

± 10%

None of these

± 5%

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

Copper

Tungsten

Iron

Silver

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

None of these

Flow of neutron

Flow of negative charge

Flow of positive charge

Page 4 of 4

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

The resistor value decreased

It is impossible to determine the change in the resistor value

The resistor value increased

The resistor value did not change

77. Thermocouple is an arrangement of two different metals

To convert electric energy in to heat energy

To convert heat energy into chemical energy

To produce more heat

To convert heat energy in to electrical energy

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

Inter-electron collisions

Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Collisions of conduction electrons with atoms

79. 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

110 V

118 V

100 V

112 V

80. 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

0.1 watt

100 watt

1 watt

10 watt

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

0.5 A

2 A

1.2 A

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

Negative charges

Both positive and negative charges

None of these

Positive charges

83. The wire used in rheostat, is made from

Maganin

Constantan

Tungston

Nichrome

84. 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

1 Ω

0.10 Ω

10 Ω

Zero

85. The graphical representation of Ohms law is

Parabola

Hyperbola

Straight line

Ellipse

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

250 W

302.5 W

350 W

200 W

87. The thermistors are usually made of

Metals with high temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

Metal oxides with high temperature coefficient of resistivity

Metals with low temperature coefficient of resistivity

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

One ohm

One farad

One coulomb

One ampere

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

Ohmic device

Neither Ohmic nor non Ohmic

Non-ohmaic device

None of these

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

8 A

15 A

5 A

20 A

91. The resistivity of wire depends upon:

Its area of cross section

Its shape

Its material

Its length

92. 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

93. 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

94. 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?

0.625 x 10¹⁹

0.625 x 10¹²

1.6 x 10¯¹⁹

1.6 x 10¹⁹

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

Positive and negative

Neutral

Negative

Positive

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

Increasing the area

None of these

Decreasing the length

Changing resistivity

97. 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

5 volt

15 volt

9 volt

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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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