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MDCAT Physics Current Electricity Online Test

Malik TahirLast Updated: May 26, 2025

Physics Current Electricity MCQS Online Test

MDCAT Current Electricity Chapter Online Test

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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Page 1 of 4

1. 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 ± 5%

21 x 10³ ± 10%

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

Different

Same

None of these

Greater than highest resistance

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

Current

Specific resistance

Effective resistance

Conductance

4. The colour coded carbon resistances are made by

Ceramic rod

High grade ceramic rod

All of these

Low grade ceramic rod

5. The resistivity of wire depends upon:

Its area of cross section

Its material

Its shape

Its length

6. Reciprocal of resistivity is called

Resistance

Conductivity

Inductance

Flexibility

7. Internal resistance is the resistance offered by

Resistor

Source of e m f

Conductor

Capacitor

8. 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 V

17 V

15 V

16 V

9. 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

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

Solar energy

Heat

Light

None of these

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

r / 4

2 r

r / 2

4 r

12. If voltage across a resistance doubles

The resistance doubles

None of these

The current is halved

The current is unchanged

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

Neutral

Negative

Positive and negative

Positive

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

Volt

Coulomb

Ampere

None of these

15. The strength of an magnetic field depends upon the

None of these

A and B

Value of current

Distance from the source

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

The internal resistance of battery is infinite

The battery is charged

The battery is discharged

The internal resistance of battery is zero

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

10 K

15 KJ

15 K

20 K

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

Its internal resistance is maximum

The circuit is open

The circuit is closed

Its internal resistance is minimum

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

Remains the same

Becomes zero

Is halved

Is doubled

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

Tungsten

Silver

Copper

Iron

21. The conductivity of a superconductor is

Zero

Infinite

Very small

Very large

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

The resistor value did not change

The resistor value decreased

The resistor value increased

It is impossible to determine the change in the resistor value

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

10¯³ ms¯¹

10¯⁴ ms¯¹

10¯⁵ ms¯¹

10¯⁶ ms¯¹

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

P = V/I

P = R/V²

P = I/V²

P = V²/R

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

Both diameter and cross-sectional area

Length

Diameter

Cross-sectional area

Page 2 of 4

26. 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

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

Inter-atomic collisions

Collisions of conduction electrons with atoms

Fall of electrons from higher orbits to lower orbits

Inter-electron collisions

28. Thermocouples convert heat energy into

Electrical energy

None of these

Chemical energy

Mechanical energy

29. Internal resistance is the resistance offered by

Source of emf

The circuit

The resistor

The conductor

30. The resistively ρ of Tungoston in Ωm is

4.8 x 10¯⁸

5.00 x 10¯⁸

None of these

4.00 x 10¯⁸

31. 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

0.7 Ω

0.1 Ω

0.8 Ω

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

None of these

Current

Attraction of charges

Repulsion of charges

33. Thermocouples convert:

Electrical energy into heat energy

Kinetic energy into potential energy

Heat energy into electrical energy

Light energy into electrical energy

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

0.8 g

10.8 g

108 g

108/0.8 g

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

Alloy

Semiconductor

Insulator

Conductor

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

May increase or decrease

Remains the same

Always decreases

Always increases

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

3 ohms

0.1 ohm

1 ohm

2 ohms

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

More heat is produced in thick wire

No heat is produced in wire

More heat is produced in thin wire

Less heat is produced in thick wire

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

125 W

80 W

100 W

64 W

40. Resistance of a conductor depends upon

All of above

Nature of conductor

Physical state of the conductor

Dimension of conductor

41. Resistively depends upon the resistance of the material of

(meter)²

None of these

(meter)³

Meter

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

118 V

100 V

112 V

110 V

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

Mechanical energy

Chemical energy

Solar energy

All of these

44. Specific resistance of a wire depends upon

None of these

Mass

Cross-section area

Length

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

60 V

90 V

30 V

0 V

46. The resistivity of constant on is Ω m is

10 x 10¯⁸

None of these

49 x 10¯⁸

50 x 10¯⁸

47. Current provided by a battery is maximum when

None of these

Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less then external resistance

48. The thermistors are usually made of

Metals with low temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Metal oxides with high temperature coefficient of resistivity

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

Relation

Effect

None of these

Result

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

None of these

Heating effect

Magnetic effect

Chemical effect

Page 3 of 4

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

± 20%

None of these

± 10%

± 5%

52. The passage of an electric current produces

Magnetic effect

Chemical effect

All of these

Heating effect

53. 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

200 W

350 W

54. The unit of conductance of a material is

Ohm

Siemen

All of these

mho

55. 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

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

5.0 Ω

0.5 Ω

1.1 Ω

Zero

57. Kirchhoff’s first rule is also known as

All of them

Law of conservation of charge

Kirchhoff’s current rule

Kirchhoff’s point rule

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

1310 W

1210 W

670 W

810 W

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

500 volts

800 volts

600 volts

700 volts

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

Joule Thomsons effect

Comptons effect

Joule effect

Feed back effect

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

Increasing the area

Decreasing the length

None of these

Changing resistivity

62. 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

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

Increase

Not enough information

Decrease

Stay the same

64. In a voltmeter the conduction takes place due to

Electrons and ions

Electrons and holes

Holes only

Electrons only

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

2 A

0.5 A

1.2 A

66. The graphical representation of Ohms law is

Ellipse

Parabola

Straight line

Hyperbola

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

It increases by a factor of five

It decreases by a factor of five

Not enough information

It stays the same

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

One ampere

One coulomb

One ohm

One farad

69. The wire used in rheostat, is made from

Maganin

Nichrome

Constantan

Tungston

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

Greater than the greatest resistance in series

Equal to the greatest resistance in series

Less than the largest resistance in series

Less than the smallest resistance in series

71. Heat energy dissipated in resistors is defined as:

l²Rt

Vlt

None of these

Both a and b

72. Photovoltaic cell converts:

Chemical energy into electrical energy

Light energy into electrical energy

Heat energy into electrical energy

None of these

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

Protons

Neutrons

Still under controversy

Free electrons

74. 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

9 volt

3 volt

15 volt

5 volt

75. Electrical power dissipation in resistors is given by

V/Q x ∆t

V ∆Q/∆t

Q ∆V/∆t

∆W/∆Q x V

Page 4 of 4

76. 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

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

1.5 Ω

6.0 Ω

12 Ω

3.0 Ω

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

Same current

Difference current and different potential difference

Same current and potential difference

Different current but same potential difference

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

All of these

Lattice

Atoms

Electrons

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

10 watt

0.1 watt

100 watt

1 watt

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

2.5 V

25.0 V

0.04 V

10,000 V

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

6 R

4 R

16 R

2 R

83. Ohm’s law describes the mathematical relationship between

Resistance, voltage, and current

Ohms, kilohms, and megohms

None of these above

Resistor size and resistor value

84. 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

8 A

5 A

15 A

85. The resistivity ρ of copper in Ω m is

1.56 x 10¯⁸

1.52 x 10¯⁸

None of these

1.54 x 10¯⁸

86. 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

Same as original one

Half of the original one

87. The value of resistance depends upon

All of them

Nature

Physical state

Dimension

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

No specific criterion available

Very good conductor

An insulator

Moderately good conductor

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

Zero amperes

1 ampere

0.5 amperes

2 amperes

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

Collisions of free electrons with atoms or ions of conductor

High drift speed of free electrons

High resistance value

Collisions of free electrons with one another

91. 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

1.6 x 10¯¹⁹

0.625 x 10¹²

1.6 x 10¹⁹

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

R₁ = 2R₂

R₁ = 4R₂

R₂ = 2R₁

R₂ = 4R₁

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

Negative charges

Both positive and negative charges

Positive charges

None of these

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

None of these

Ohmic device

Non-ohmaic device

Neither Ohmic nor non Ohmic

95. 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

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

3/11 A

3 A

11/3 A

6 A

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

Flow of positive charge

Flow of negative charge

None of these

Flow of neutron

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Malik TahirLast Updated: May 26, 2025

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MDCAT Physics Current Electricity Online Test

Physics Current Electricity MCQS Online Test

MDCAT Current Electricity Chapter Online Test

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