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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. Photovoltaic cell converts:

None of these

Chemical energy into electrical energy

Heat energy into electrical energy

Light energy into electrical energy

2. 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

2.2 K Ω

3.3 K Ω

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

700 volts

600 volts

500 volts

800 volts

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

Less than the smallest resistance in series

Less than the largest resistance in series

Greater than the greatest resistance in series

Equal to the greatest resistance in series

5. Thermocouples convert:

Heat energy into electrical energy

Light energy into electrical energy

Kinetic energy into potential energy

Electrical energy into heat energy

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

Neutrons

Protons

Free electrons

Still under controversy

7. If voltage across a resistance doubles

The current is unchanged

The current is halved

The resistance doubles

None of these

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

Attraction of charges

Repulsion of charges

Current

None of these

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

1310 W

810 W

1210 W

670 W

10. 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

Zero

5.0 Ω

0.5 Ω

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

P = R/V²

P = I/V²

P = V/I

P = V²/R

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

Mechanical energy

Chemical energy

All of these

Solar energy

13. Internal resistance is the resistance offered by

Resistor

Conductor

Capacitor

Source of e m f

14. Current provided by a battery is maximum when

Internal resistance is greater than external resistance

Internal resistance is less then external resistance

Internal resistance equal to external resistance

None of these

15. 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

5 A

8 A

15 A

16. 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

17. 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

100 V

112 V

110 V

118 V

18. 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

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

Increase

Stay the same

Not enough information

Decrease

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

Maximum current flows through the galvanometer branch

Minimum current flows through the galvanometer branch

Potential difference across galvanometer branch is zero

Potential difference across galvanometer branch is maximum

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

200 W

350 W

302.5 W

250 W

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

High resistance value

Collisions of free electrons with atoms or ions of conductor

Collisions of free electrons with one another

High drift speed of free electrons

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

Different

Same

None of these

Greater than highest resistance

24. The colour coded carbon resistances are made by

Low grade ceramic rod

High grade ceramic rod

Ceramic rod

All of these

25. The resistivity ρ of copper in Ω m is

None of these

1.54 x 10¯⁸

1.56 x 10¯⁸

1.52 x 10¯⁸

Page 2 of 4

26. 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 10¹⁹

0.625 x 10¹²

1.6 x 10¯¹⁹

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

Decreasing the length

None of these

Increasing the area

Changing resistivity

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

Positive charges

None of these

Negative charges

Both positive and negative charges

29. The passage of an electric current produces

Magnetic effect

Chemical effect

All of these

Heating effect

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

Its internal resistance is maximum

The circuit is closed

The circuit is open

Its internal resistance is minimum

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

Negative

Positive

Neutral

Positive and negative

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

Tungsten

Copper

Silver

Iron

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

2 A

1.2 A

0.5 A

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

Comptons effect

Feed back effect

Joule Thomsons effect

Joule effect

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

May increase or decrease

Always increases

Always decreases

Remains the same

36. Internal resistance is the resistance offered by

The conductor

The resistor

Source of emf

The circuit

37. Thermocouple is an arrangement of two different metals

To produce more heat

To convert heat energy in to electrical energy

To convert heat energy into chemical energy

To convert electric energy in to heat energy

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

An insulator

Very good conductor

Moderately good conductor

No specific criterion available

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

Length

Both diameter and cross-sectional area

Cross-sectional area

Diameter

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

12 V

20 V

10 V

16 V

41. In a voltmeter the conduction takes place due to

Holes only

Electrons and ions

Electrons and holes

Electrons only

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

± 20%

± 10%

None of these

± 5%

43. The value of resistance depends upon

Dimension

Physical state

All of them

Nature

44. The resistivity of wire depends upon:

Its area of cross section

Its material

Its shape

Its length

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

60 V

0 V

30 V

90 V

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

R₂ = 2R₁

R₁ = 2R₂

R₂ = 4R₁

R₁ = 4R₂

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

108/0.8 g

108 g

0.8 g

10.8 g

48. 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

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

Atoms

Electrons

All of these

Lattice

50. The strength of an magnetic field depends upon the

A and B

Value of current

Distance from the source

None of these

Page 3 of 4

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

None of these

Non-ohmaic device

Ohmic device

Neither Ohmic nor non Ohmic

52. 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

53. The thermistors are usually made of

Metal oxides with high temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Metals with low temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

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

6.0 Ω

1.5 Ω

12 Ω

3.0 Ω

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

1 ampere

2 amperes

0.5 amperes

Zero amperes

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

11/3 A

3/11 A

6 A

3 A

57. Resistively depends upon the resistance of the material of

(meter)³

None of these

(meter)²

Meter

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

One coulomb

One ampere

One farad

One ohm

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

The resistor value increased

The resistor value did not change

It is impossible to determine the change in the resistor value

The resistor value decreased

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

r / 2

r / 4

2 r

4 r

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

More heat is produced in thin wire

More heat is produced in thick wire

No heat is produced in wire

Less heat is produced in thick wire

62. Thermocouples convert heat energy into

Mechanical energy

Electrical energy

None of these

Chemical energy

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

Effective resistance

Current

Specific resistance

Conductance

64. 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

0.8 Ω

0.7 Ω

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

None of these

Effect

Result

Relation

66. The unit of conductance of a material is

mho

Ohm

Siemen

All of these

67. 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

68. The resistivity of constant on is Ω m is

50 x 10¯⁸

None of these

10 x 10¯⁸

49 x 10¯⁸

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

100 W

64 W

80 W

125 W

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

Magnetic effect

Heating effect

Chemical effect

None of these

71. Kirchhoff’s first rule is also known as

All of them

Kirchhoff’s current rule

Law of conservation of charge

Kirchhoff’s point rule

72. Resistance of a conductor depends upon

Nature of conductor

All of above

Dimension of conductor

Physical state of the conductor

73. Specific resistance of a wire depends upon

Mass

Cross-section area

Length

None of these

74. Ohm’s law describes the mathematical relationship between

Resistor size and resistor value

Ohms, kilohms, and megohms

Resistance, voltage, and current

None of these above

75. Potentiometer is more sensitive than voltmeter, because

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

Potentiometer is sensitive

Voltmeter has a very low resistance

Voltmeter has a very high resistance

Page 4 of 4

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

Semiconductor

Conductor

Alloy

Insulator

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

Fall of electrons from higher orbits to lower orbits

Inter-electron collisions

Collisions of conduction electrons with atoms

Inter-atomic collisions

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

10¯⁶ ms¯¹

10¯⁴ ms¯¹

10¯³ ms¯¹

10¯⁵ ms¯¹

79. Reciprocal of resistivity is called

Resistance

Conductivity

Flexibility

Inductance

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

16 R

6 R

2 R

4 R

81. 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

82. 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

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

None of these

Heat

Light

Solar energy

84. 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

Difference current and different potential difference

Same current

Different current but same potential difference

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

Flow of neutron

Flow of negative charge

Flow of positive charge

None of these

86. 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%

87. 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

15 V

17 V

18 V

88. The graphical representation of Ohms law is

Parabola

Hyperbola

Ellipse

Straight line

89. The wire used in rheostat, is made from

Nichrome

Constantan

Tungston

Maganin

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

Coulomb

Ampere

Volt

None of these

91. The conductivity of a superconductor is

Infinite

Very small

Zero

Very large

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

1 ohm

2 ohms

0.1 ohm

3 ohms

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

Not enough information

It decreases by a factor of five

It stays the same

It increases by a factor of five

94. Electrical power dissipation in resistors is given by

V ∆Q/∆t

∆W/∆Q x V

V/Q x ∆t

Q ∆V/∆t

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

10 K

15 K

15 KJ

20 K

96. 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

5 volt

3 volt

9 volt

15 volt

97. Heat energy dissipated in resistors is defined as:

None of these

Vlt

Both a and b

l²Rt

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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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