# Class 10 Physics Chapter 5

Updated: 18 Dec 2023

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Class 10 Physics Chapter 5 introduces the concept of “Current Electricity”. This is mainly chapter No. 14, “Current Electricity”, of the book of Class 10.
This article consists of Notes, SLO Based Notes and MCQs of Physics, which cover your course, board papers and clear your Physics concept for different types of tests.

## Class 10 Physics Chapter 5 Notes

### Current Electricity

Class 10 Physics Chapter No. 14 Notes

### SLO Base Notes

Class 10 Physics Chapter 14 SLO Base Notes

## Class 10 Physics Chapter 5 MCQs

1. The study of charge in motion is called:
(a) Electromagnetism
(b) Electrostatics
(c) Current electricity
(d) Quantum mechanics

Current electricity

2. The time at which charge flows through an area is called:
(a) Voltage
(b) Electric current
(c) Capacitance
(d) Resistance

Electric current

3. What is the symbol used to represent electric current?
(a) I
(b) V
(c) R
(d) Q

I

4. Which of the following formulas represents electric current?
(a) I = \frac{Q}{t}
(b) V = IR
(c) P = VI
(d) C = \frac{Q}{V}

I = \frac{Q}{t}

5. The unit of electric current is named after which scientist?
(a) Volt
(b) Ampere
(c) Ohm
(d) Coulomb

Ampere

6. What is the SI unit of electric current?
(a) Coulomb
(b) Volt
(c) Ampere
(d) Ohm

Ampere

7. One Ampere is equal to:
(a) 1 \ C/s
(b) 1 \ V/s
(c) 1 \ \Omega /s
(d) 1 \ W/s

1 C/s

8. What is the direction of conventional current flow?
(a) From negative to positive
(b) From positive to negative
(c) It varies with the material
(d) It doesn’t have a fixed direction

From positive to negative

9. Which term is used for the actual direction of charge carriers in conductors like metals?
(a) Conventional current flow
(b) Proton flow
(c) Electron flow
(d) Neutron flow

Electron flow

10. In real-life situations, small values of current are often measured in:
(a) Kilo ohms
(b) Milliamperes (mA)
(c) Megawatts
(d) Microvolt (\mu V)

Milliamperes (mA)

11. Which particle is the primary charge carrier in metals when it comes to electric current?
(a) Protons
(b) Neutrons
(c) Electrons
(d) Positrons

Electrons

12. If a charge of 8 Coulombs flows through a conductor in 2 seconds, what is the current?
(a) 3 A
(b) 12 A
(c) 1.5 A
(d) 4 A

4 A

13. A circuit allows a current of 0.5 A to flow and 10 Coulombs of charge pass through it. How long did this take?
(a) 2 s
(b) 20 s
(c) 5 s
(d) 50 s

20 s

14. If the current in a wire is 2 A and it flows for 10 seconds, how much charge has passed through the wire?
(a) 5 C
(b) 12 C
(c) 20 C
(d) 2 C

20 C

15. The difference of electric potential between two points is called:
(a) Potential difference
(b) Current
(c) Resistance
(d) Charge

Potential difference

16. What unit is used to measure potential difference?
(a) Ampere
(b) Ohm
(c) Joule
(d) Volt

Volt

17. The potential difference developed and maintained by a source of electrical energy is known as:
(a) Voltage
(b) Current
(c) Electromotive force (emf)
(d) Resistance

Electromotive force (emf)

18. The energy spent per unit positive charge by the source to move it from the negative terminal to the positive terminal within the source is called:
(a) Potential difference
(c) Voltage
(d) Electromotive force (emf)

Electromotive force (emf)

19. What is the SI unit of electromotive force (emf)?
(a) Ohm
(b) Coulomb
(c) Joule
(d) Volt

Volt

20. Which of the following formulas represents electromotive force (emf)?
(a) E = \frac{I}{R}
(b) E = \frac{Q}{t}
(c) E = \frac{W}{q}
(d) E = \frac{V}{I}

E = \frac{W}{q}

21. “The current in a conductor is directly proportional to the applied voltage across the conductor as long as temperature and the physical state of the conductor is kept constant” describes:
(a) Ohm’s Law
(b) Newton’s Law
(d) Coulomb’s Law

Ohm’s Law

22. According to Ohm’s Law, what is the relationship between voltage (V), current (I), and resistance (R)?
(a) I = VR
(b) V = IR
(c) R = IV
(d) V = \frac{I}{R}

V = IR

23. Ohm’s Law is most applicable to which type of materials?
(a) Metals
(b) Gases
(c) Liquids
(d) Insulators

Metals

24. According to Ohm’s Law, if you double the voltage applied to an ohmic device, what happens to the current?
(a) It decreases
(b) It remains the same
(c) It doubles
(d) It becomes zero

It doubles

25. If the resistance of a conductor is doubled while the voltage remains constant, what happens to the current?
(a) It doubles
(b) It halves
(c) It remains the same
(d) It depends on the material

It halves

26. If the current in a circuit is 3 amperes (A) and the resistance is 5 ohms (\mu) , what is the voltage across the circuit?
(a) 8 V
(b) 15 V
(c) 0.6 V
(d) 2.5 V

15 V

27. A resistor has a voltage of 12 volts (V) applied to it, and it allows a current of 4 amperes (A) to flow. What is the resistance of the resistor?
(a) 3 \ \mu
(b) 48 \ \mu
(c) 16 \ \mu
(d) 8 \ \mu

3 \ \mu

28. A resistor with a voltage of 15 volts (V) applied across it has a resistance of 3 ohms (\mu) . What is the current flowing through this resistor?
(a) 5 A
(b) 18 A
(c) 12 A
(d) 45 A

5 A

29. What are devices that follow Ohm’s Law and exhibit a direct relationship between current and voltage called?
(a) Non-Ohmic devices
(b) Ohmic devices
(c) Electronic devices
(d) None of these

Ohmic devices

30. The opposition offered to the flow of charges is called:
(a) Voltage
(b) Current
(c) Resistance
(d) Conductance

Resistance

31. What is electrical resistance in a conductor primarily caused by in metallic conductors?
(a) Voltage
(b) Collisions between free electrons and fixed atoms
(c) Current
(d) Magnetic fields

Collisions between free electrons and fixed atoms

32. According to Ohm’s law, how is resistance (R) mathematically related to voltage (V) and current (I)?
(a) R = \frac{V}{I}
(b) V = Rt
(c) I = VR
(d) R = IV

R = \frac{V}{I}

33. What is the SI unit of electrical resistance?
(a) Volt
(b) Ampere
(c) Ohm (\mu)
(d) Coulomb

Ohm (\mu)

34. One ohm is equal to:
(a) 1 \frac{A}{V}
(b) 1 \frac{C}{V}
(c) 1 \frac{J}{A}
(d) 1 \frac{V}{A}

1 \frac{V}{A}

35. What is a wire or an electrical device that offers resistance to the flow of charges called?
(a) Conductor
(b) Insulator
(c) Resistor
(d) Capacitor

Resistor

36. In circuit diagrams, what is the commonly used symbol to represent a resistor?
(a) A zigzag line
(b) A straight line
(c) A circle
(d) An arrow

A zigzag line

37. Which of the following factors affects the resistance of a metallic conductor by increasing it?
(a) Length
(b) Cross-sectional area
(c) Temperature
(d) All of these

All of these

38. When the length of a metallic conductor is increased, what happens to its resistance?
(a) It decreases
(b) It remains the same
(c) It increases
(d) None of these

It increases

39. If the cross-sectional area of a metallic conductor is decreased, what effect does it have on its resistance?
(a) Resistance decreases
(b) Resistance remains constant
(c) Resistance increases
(d) None of these

Resistance increases

40. Which of the following materials has low resistance:
(a) Copper
(b) Aluminum
(c) Iron
(d) Insulating rubber

Copper

41. Which material is commonly used to make resistors?
(a) Copper
(b) Carbon
(c) Aluminum
(d) Silver

Carbon

42. Variable resistors are often used in electronics for what purpose?
(a) To act as insulators
(b) As capacitors
(c) As volume and other controls
(d) To enhance conductivity

As volume and other controls

43. When resistors are connected in series, what happens to their total resistance?
(a) It increases
(b) It decreases
(c) It remains the same
(d) None of these

It increases

44. In a series combination of resistors, the equivalent resistance is calculated using which formula?
(a) R_e = R_1 + R_2 + R_3
(b) \frac{1}{R_e} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}
(c) R_e = R_1 \times R_2 \times R_3
(d) R_e = R_1 - R_2 - R_3

R_e = R_1 + R_2 + R_3

45. In a series combination of resistors, what quantity stays the same across each resistor?
(a) Voltage
(b) Current
(c) Energy
(d) Resistance

Current

46. What quantity is distributed across each resistor connected in series?
(a) Voltage
(b) Current
(c) Energy
(d) Resistance

Voltage

47. Two resistors, R_1 \ and \ R_2 , are connected in series. If R_1 = 20 \ ohms \ and \ R_2 = 30 \ ohms , what is the value of the total resistance (R) in the series combination?
(a) 50 ohms
(b) 10 ohms
(c) 15 ohms
(d) 200 ohms

50 ohms

48. You have three resistors in series, R_1 = 5 \ ohms, \ R_2 = 10 \ ohms \ and \ R_3 = 15 \ ohms . What is the total resistance (R) of this series combination?
(a) 30 ohms
(b) 5 ohms
(c) 20 ohms
(d) 150 ohms

30 ohms

49. Two resistors, R_1 \ and \ R_2 , are connected in series. If the total resistance (R) is 24 ohms and R_2 = 8 \ ohms , what is the value of R_1 ?
(a) 32 ohms
(b) 16 ohms
(c) 12 ohms
(d) 4 ohms

16 ohms

50. When resistors are connected in parallel, what happens to their total resistance?
(a) It increases
(b) It remains the same
(c) It decreases
(d) None of these

It decreases

51. In a parallel combination of resistors, the equivalent resistance is calculated using which formula?
(a) R_e = R_1 + R_2 + R_3
(b) \frac{1}{R_e} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}
(c) R_e = R_1 \times R_2 \times R_3
(d) R_e = R_1 - R_2 - R_3

\frac{1}{R_e} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}

52. In a parallel combination of resistors, what quantity stays the same across each resistor?
(a) Voltage
(b) Current
(c) Energy
(d) Resistance

Voltage

53. What quantity is distributed across each resistor connected in parallel?
(a) Voltage
(b) Current
(c) Energy
(d) Resistance

Current

54. Two resistors, R_1 \ and \ R_2 , are connected in parallel. If R_1 = 20 \ ohms \ and \ R_2 = 30 \ ohms , what is the value of the total resistance (R) in the parallel combination?
(a) 12 ohms
(b) 15 ohms
(c) 10 ohms
(d) 50 ohms

12 ohms

55. You have three resistors in parallel, R_1 = 5 \ ohms, \ R_2 = 10 \ ohms \ and \ R_3 = 15 \ ohms . What is the total resistance (R) of this parallel combination?
(a) 2.5 ohms
(b) 5 ohms
(c) 2.73 ohms
(d) 30 ohms

2.73 ohms

56. Two resistors, R_1 \ and \ R_2 , are connected in parallel. If the total resistance (R) is 4 ohms and R_2 = 12 \ ohms , what is the value of R_1 ?
(a) 6 ohms
(b) 8 ohms
(c) 16 ohms
(d) 48 ohms

6 ohms

57. What are conductors for which Ohm’s law holds called?
(a) Ohmic conductors
(b) Non-ohmic conductors
(c) Superconductors
(d) Semiconductors

Ohmic conductors

58. In an I-V graph, what kind of relationship is observed for Ohmic conductors?
(a) Linear (straight line)
(b) Exponential
(c) Parabolic
(d) No relationship

Linear (straight line)

59. What is the unit of electrical energy?
(a) Joules (J)
(b) Volts (V)
(c) Amperes (A)
(d) Watts (W)

Joules (J)

60. Which formula is used to calculate electrical energy (E) when you know the charge (Q) and potential difference (V)?
(a) E = ItV
(b) E = I^2Rt
(c) E = \frac{V^2t}{R}
(d) E = QV

E = QV

61. If a charge of 20 C flows through a circuit with a potential difference of 10 V, what is the electrical energy consumed or delivered?
(a) 30 J
(b) 200 J
(c) 2 J
(d) 2000 J

200 J

62. When a current of 5 A flows through a resistor with a resistance of 2 ohms for 10 seconds, how much electrical energy is dissipated as heat?
(a) 10 J
(b) 100 J
(c) 500 J
(d) 20 J

500 J

63. If the potential difference across a circuit is 5 V, and the resistance is 2 ohms, and it operates for 4 seconds, how much electrical energy is used?
(a) 30 J
(b) 20 J
(c) 50 J
(d) 60 J

50 J

64. According to Joule’s law of heating, the amount of heat generated in a resistor is proportional to which factors?
(a) I^2Rt
(b) V^2Rt
(c) \frac{I}{V}
(d) IRT

I^2Rt

65. In Joule’s law of heating, what quantity is squared to determine the heat generated in a resistor?
(a) Voltage (V)
(b) Current (I)
(c) Resistance (R)
(d) Time (t)

Current (I)

66. The electrical energy lost in a device due to potential difference across it can be represented as an equation called:
(a) Ohm’s law
(b) Watt’s formula
(c) Newton’s law
(d) Joule’s law

Joule’s law

67. When current flows through a resistor for a longer duration of time, what happens to the heat generated, as per Joule’s law?
(a) It decreases
(b) It remains constant
(c) It increases
(d) It becomes zero

It increases

68. The time rate at which work is done in an electric circuit is called:
(a) Electrical charge
(b) Electric potential
(c) Electric resistance
(d) Electric power

Electric power

69. How electric power (P) is mathematically expressed in terms of work (W) and time (t)?
(a) P = \frac{W}{t}
(b) P = W + t
(c) P = W \times t
(d) P = W - t

P = \frac{W}{t}

70. A device consumes 6000 Joules of energy in 10 seconds. What is the power of the device?
(a) 60 Watts
(b) 600 Watts
(c) 6,000 Watts
(d) 6 Watts

600 Watts

71. In a circuit, the current is 2 amperes (A), and the voltage is 12 volts (V). What is the power of the circuit?
(a) 6 Watts
(b) 24 Watts
(c) 14 Watts
(d) 2 Watts

24 Watts

72. A resistor with a resistance of 8 ohms (\Omega) has a current of 2 amperes (A) passing through it. What is the power dissipated in the resistor?
(a) 16 Watts
(b) 2 Watts
(c) 32 Watts
(d) 12 Watts

32 Watts

73. If a circuit has a voltage of 20 volts (V) and a resistance of 5 ohms (Ω), what is the power dissipated in the circuit?
(a) 100 Watts
(b) 5 Watts
(c) 80 Watts
(d) 25 Watts

80 Watts

74. What is the SI unit for electrical power?
(a) Volt (V)
(b) Ampere (A)
(c) Joule (J)
(d) Watt (W)

Watt (W)

75. What is the preferred unit for measuring electrical energy consumed in most homes and businesses, as opposed to the small unit of the joule?
(a) Kilowatt-hour (kWh)
(b) Megawatt (MW)
(c) Gigawatt-hour (GWh)
(d) Watt-second (Ws)

Kilowatt-hour (kWh)

76. If a device with a power rating of 500 watts (0.5 kW) runs continuously for 4 hours, how much energy does it consume in kilowatt-hours?
(a) 200 kWh
(b) 2 kWh
(c) 0.02 kWh
(d) 20 kWh

2 kWh

77. The cost of electricity is often determined based on the consumption of:
(a) Joules (J)
(b) Volts (V)
(c) Kilowatts (kW)
(d) Kilowatt-hours (kWh)

Kilowatt-hours (kWh)

78. 1 kWh is equal to:
(a) 1000 watts
(b) 1 joule
(c) 3600 seconds
(d) 3.6 × 106 joules

3.6 × 106 joules

79. The formula for calculating the cost (Cost) of electrical energy consumption is:
(a) Cost = E - Tariff \ Rate
(b) Cost = E \times Tariff \ Rate
(c) Cost = \frac{E}{Tariff \ Rate}
(d) Cost = E + Tariff \ Rate

Cost = E \times Tariff \ Rate

80. If you consumed 400 kWh of electrical energy and the tariff rate is 15 PKR per kWh, what is the total cost of your electricity bill in PKR?
(a) 30 PKR
(b) 50 PKR
(c) 60 PKR
(d) 6,000 PKR

6,000 PKR

81. Which component is used as a safety device that blows or melts if the current through it exceeds a specified value?
(a) Capacitor
(b) Resistor
(c) Power Supply
(d) Fuse

Fuse

82. A device that allows or blocks the flow of current:
(a) Resistor
(b) Capacitor
(c) Switch
(d) Lamp

Switch

83. A device that is used to detect very small currents and voltages:
(a) Galvanometer
(b) Ammeter
(c) Voltmeter
(d) Oscilloscope

Galvanometer

84. Which instrument is used for measuring current in a circuit?
(a) Galvanometer
(b) Voltage meter
(c) Ammeter
(d) Resistance meter

Ammeter

85. In what manner should an Ammeter be connected in a circuit for measuring current?
(a) In parallel
(b) In series
(c) In a closed loop
(d) None of these

In series

86. The resistance of an ammeter is kept:
(a) High
(b) Low
(c) Variable
(d) None of these

Low

87. Which instrument is used for measuring potential difference in a circuit?
(a) Galvanometer
(b) Ammeter
(c) Voltmeter
(d) Resistance meter

Voltmeter

88. How should a voltmeter be connected in a circuit to measure potential difference?
(a) In parallel
(b) In series
(c) In a closed loop
(d) None of these

In parallel

89. The resistance of a voltmeter is typically kept:
(a) High
(b) Low
(c) Variable
(d) None of these

High

90. What is the primary purpose of a digital multi-meter (DMM) in electrical measurements?
(a) To measure current
(b) To measure potential difference
(c) To function as both an ammeter and a voltmeter
(d) None of these

To function as both an ammeter and a voltmeter

91. The type of current in which electric charge flows in one direction continuously without reversal is:
(a) Direct current (DC)
(b) Variable current
(c) Oscillating current (OC
(d) Alternating current (AC)

Direct current (DC)

92. A type of electric current in which the direction of the flow of electric charge periodically reverses is:
(a) Direct current (DC)
(b) Variable current
(c) Oscillating current (OC)
(d) Alternating current (AC)

Alternating current (AC)

93. Which of the following can produce both DC and AC?
(a) Electric generators
(b) Ammeters
(c) Resistors
(d) Capacitors

Electric generators

94. What can a multi-meter measure?
(a) Only DC
(b) Only AC
(c) Both DC and AC
(d) Neither DC nor AC

Both DC and AC

95. In typical house circuits, what are the two wires in the supply cable known as?
(a) Positive and negative
(b) Live and neutral
(c) Series and parallel
(d) Red and black

Live and neutral

96. What type of current is the supply to homes in most cases?
(a) Direct current (DC)
(b) Alternating current (AC)
(c) Static electricity
(d) Batteries

Alternating current (AC)

97. In house circuits, where are switches and fuses typically installed?
(a) Only on the neutral wire
(b) On the ground wire
(c) Only on the live wire
(d) On both live and neutral wires

Only on the live wire

98. Which safety devices are typically used to prevent excessive current flow and protect household appliances?
(a) Circuit breakers
(b) Extension cords
(c) Power strips
(d) Light bulbs

Circuit breakers

99. In modern consumer units, what is used instead of fuses for electrical protection?
(a) Light switches
(b) Circuit breakers
(c) Extension cords
(d) Power strips

Circuit breakers

100. What is the typical resistance of dry skin?

101. How much current can cause death in some cases?
(a) 1 mA
(b) 10 mA
(c) 100 mA
(d) 1.5 mA