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ECAT Physics Current Electricity Online Test

Maan AliLast Updated: April 18, 2025

Physics Current Electricity MCQS Online Test

ECAT 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 current through a metallic conductor is due to the motion of

Free electrons

Neutrons

Protons

Still under controversy

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

Heating effect

None of these

Magnetic effect

Chemical effect

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

High resistance value

Collisions of free electrons with atoms or ions of conductor

High drift speed of free electrons

Collisions of free electrons with one another

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

P = V²/R

P = V/I

P = I/V²

P = R/V²

5. The colour coded carbon resistances are made by

Low grade ceramic rod

Ceramic rod

High grade ceramic rod

All of these

6. 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

110 V

100 V

118 V

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

25.0 V

10,000 V

0.04 V

2.5 V

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

Becomes zero

Is doubled

Remains the same

Is halved

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

Length

Both diameter and cross-sectional area

Diameter

Cross-sectional area

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

Flow of negative charge

None of these

Flow of neutron

Flow of positive charge

11. Heat energy dissipated in resistors is defined as:

l²Rt

Vlt

None of these

Both a and b

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

All of these

Atoms

Electrons

Lattice

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

Zero amperes

2 amperes

1 ampere

0.5 amperes

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

None of these

Coulomb

Volt

Ampere

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

10¯³ ms¯¹

10¯⁵ ms¯¹

10¯⁶ ms¯¹

10¯⁴ ms¯¹

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

Positive charges

None of these

Both positive and negative charges

Negative charges

17. Ohm’s law describes the mathematical relationship between

Ohms, kilohms, and megohms

Resistance, voltage, and current

Resistor size and resistor value

None of these above

18. 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

19. The unit of conductance of a material is

All of these

mho

Ohm

Siemen

20. In a voltmeter the conduction takes place due to

Electrons only

Holes only

Electrons and holes

Electrons and ions

21. Reciprocal of resistivity is called

Inductance

Resistance

Conductivity

Flexibility

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

Copper

Iron

Silver

Tungsten

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

Result

Effect

None of these

Relation

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

Solar energy

Light

Heat

None of these

25. 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

0.1 Ω

0.7 Ω

0.8 Ω

Page 2 of 4

26. Specific resistance of a wire depends upon

None of these

Length

Cross-section area

Mass

27. The resistivity ρ of copper in Ω m is

1.54 x 10¯⁸

1.52 x 10¯⁸

None of these

1.56 x 10¯⁸

28. 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

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

Less than the largest resistance in series

Equal to the greatest resistance in series

Greater than the greatest resistance in series

Less than the smallest resistance in series

30. The conductivity of a superconductor is

Infinite

Very small

Zero

Very large

31. The resistively ρ of Tungoston in Ωm is

4.8 x 10¯⁸

None of these

5.00 x 10¯⁸

4.00 x 10¯⁸

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

The battery is charged

The internal resistance of battery is infinite

The internal resistance of battery is zero

The battery is discharged

33. 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

350 W

250 W

34. 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

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

± 10%

None of these

± 5%

± 20%

36. 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

Same current

Difference current and different potential difference

Different current but same potential difference

37. Resistance of a conductor depends upon

Nature of conductor

Physical state of the conductor

All of above

Dimension of conductor

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

125 W

64 W

100 W

80 W

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

Solar energy

Chemical energy

All of these

Mechanical energy

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

Remains the same

Always decreases

Always increases

May increase or decrease

41. Current provided by a battery is maximum when

Internal resistance is less then external resistance

Internal resistance is greater than external resistance

None of these

Internal resistance equal to external resistance

42. Kirchhoff’s first rule is also known as

Law of conservation of charge

Kirchhoff’s current rule

Kirchhoff’s point rule

All of them

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

4 r

r / 2

2 r

r / 4

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

Neither Ohmic nor non Ohmic

None of these

Non-ohmaic device

Ohmic device

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

2 R

16 R

4 R

6 R

46. 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

47. Resistively depends upon the resistance of the material of

(meter)²

(meter)³

Meter

None of these

48. Internal resistance is the resistance offered by

Source of e m f

Conductor

Resistor

Capacitor

49. 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

It stays the same

Not enough information

50. 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

Page 3 of 4

51. The resistivity of constant on is Ω m is

49 x 10¯⁸

50 x 10¯⁸

10 x 10¯⁸

None of these

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

3.3 K Ω

2.2 K Ω

9.1 K Ω

5.6 K Ω

53. 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

Zero

0.5 Ω

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

Conductor

Insulator

Semiconductor

Alloy

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

None of these

Same

Different

Greater than highest resistance

56. Internal resistance is the resistance offered by

The resistor

The circuit

Source of emf

The conductor

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

12 x 10³ ± 5%

21 x 10³ ± 10%

21 x 10³ ± 5%

23 x 10¹ ± 10%

58. 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

1 watt

100 watt

59. If voltage across a resistance doubles

The current is halved

The current is unchanged

None of these

The resistance doubles

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

The resistor value decreased

The resistor value increased

The resistor value did not change

It is impossible to determine the change in the resistor value

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

Decrease

Not enough information

Stay the same

Increase

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

3.0 Ω

6.0 Ω

12 Ω

1.5 Ω

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

The circuit is closed

The circuit is open

Its internal resistance is maximum

Its internal resistance is minimum

64. 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

20 A

15 A

5 A

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

700 volts

800 volts

600 volts

500 volts

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

Inter-electron collisions

Inter-atomic collisions

Collisions of conduction electrons with atoms

Fall of electrons from higher orbits to lower orbits

67. Potentiometer is more sensitive than voltmeter, because

Potentiometer is sensitive

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

68. Photovoltaic cell converts:

Heat energy into electrical energy

Chemical energy into electrical energy

None of these

Light energy into electrical energy

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

15 KJ

10 K

20 K

15 K

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

11/3 A

3/11 A

3 A

6 A

71. The wire used in rheostat, is made from

Maganin

Tungston

Nichrome

Constantan

72. The graphical representation of Ohms law is

Parabola

Hyperbola

Ellipse

Straight line

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

670 W

810 W

1310 W

1210 W

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

Current

None of these

Attraction of charges

Repulsion of charges

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

Potential difference across galvanometer branch is maximum

Potential difference across galvanometer branch is zero

Maximum current flows through the galvanometer branch

Minimum current flows through the galvanometer branch

Page 4 of 4

76. 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

77. 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?

15 V

18 V

17 V

16 V

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

Specific resistance

Conductance

Current

Effective resistance

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

Feed back effect

Comptons effect

Joule effect

Joule Thomsons effect

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

Moderately good conductor

No specific criterion available

An insulator

Very good conductor

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

3 ohms

2 ohms

0.1 ohm

1 ohm

82. The passage of an electric current produces

Chemical effect

Magnetic effect

All of these

Heating effect

83. 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

0.10 Ω

10 Ω

1 Ω

Zero

84. Electrical power dissipation in resistors is given by

V ∆Q/∆t

∆W/∆Q x V

Q ∆V/∆t

V/Q x ∆t

85. 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

86. Thermocouples convert heat energy into

Electrical energy

None of these

Chemical energy

Mechanical energy

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

1.2 A

2 A

0.5 A

88. Thermocouples convert:

Heat energy into electrical energy

Electrical energy into heat energy

Kinetic energy into potential energy

Light energy into electrical energy

89. The value of resistance depends upon

All of them

Dimension

Physical state

Nature

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

Positive

Negative

Neutral

Positive and negative

91. 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

92. 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

93. 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

94. The strength of an magnetic field depends upon the

None of these

Distance from the source

Value of current

A and B

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

Increasing the area

Changing resistivity

Decreasing the length

None of these

96. The resistivity of wire depends upon:

Its area of cross section

Its shape

Its material

Its length

97. 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

12 V

16 V

20 V

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Maan AliLast Updated: April 18, 2025

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ECAT Physics Current Electricity Online Test

Physics Current Electricity MCQS Online Test

ECAT Current Electricity Chapter Online Test

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