# 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

Download Chapter No. 14 Notes### 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

## Show Answer

**
Current electricity
**

**2. The time at which charge flows through an area is called:**

(a) Voltage

(b) Electric current

(c) Capacitance

(d) Resistance

## Show Answer

**
Electric current
**

**3. What is the symbol used to represent electric current?**

(a) I

(b) V

(c) R

(d) Q

## Show Answer

**
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}

## Show Answer

**
I = \frac{Q}{t}
**

**5. The unit of electric current is named after which scientist?**

(a) Volt

(b) Ampere

(c) Ohm

(d) Coulomb

## Show Answer

**
Ampere
**

**To Download Complete Notes of Physics Notes 10 Class, Click on the given link.**

**6. What is the SI unit of electric current?**

(a) Coulomb

(b) Volt

(c) Ampere

(d) Ohm

## Show Answer

**
Ampere
**

**7. One Ampere is equal to:**

(a) 1 \ C/s

(b) 1 \ V/s

(c) 1 \ \Omega /s

(d) 1 \ W/s

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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)

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
20 C
**

**15. The difference of electric potential between two points is called:**

(a) Potential difference

(b) Current

(c) Resistance

(d) Charge

## Show Answer

**
Potential difference
**

**16. What unit is used to measure potential difference?**

(a) Ampere

(b) Ohm

(c) Joule

(d) Volt

## Show Answer

**
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

## Show Answer

**
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

(b) Electromagnetic radiation

(c) Voltage

(d) Electromotive force (emf)

## Show Answer

**
Electromotive force (emf)
**

**19. What is the SI unit of electromotive force (emf)?**

(a) Ohm

(b) Coulomb

(c) Joule

(d) Volt

## Show Answer

**
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}

## Show Answer

**
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

(c) Faraday’s Law

(d) Coulomb’s Law

## Show Answer

**
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}

## Show Answer

**
V = IR
**

**23. Ohm’s Law is most applicable to which type of materials?**

(a) Metals

(b) Gases

(c) Liquids

(d) Insulators

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
Ohmic devices
**

**30. The opposition offered to the flow of charges is called:**

(a) Voltage

(b) Current

(c) Resistance

(d) Conductance

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
R = \frac{V}{I}
**

**33. What is the SI unit of electrical resistance?**

(a) Volt

(b) Ampere

(c) Ohm (\mu)

(d) Coulomb

## Show Answer

**
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}

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
Resistance increases
**

**40. Which of the following materials has low resistance:**

(a) Copper

(b) Aluminum

(c) Iron

(d) Insulating rubber

## Show Answer

**
Copper
**

**41. Which material is commonly used to make resistors?**

(a) Copper

(b) Carbon

(c) Aluminum

(d) Silver

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
Current
**

**46. What quantity is distributed across each resistor connected in series?**

(a) Voltage

(b) Current

(c) Energy

(d) Resistance

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
\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

## Show Answer

**
Voltage
**

**53. What quantity is distributed across each resistor connected in parallel?**

(a) Voltage

(b) Current

(c) Energy

(d) Resistance

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
6 ohms
**

**57. What are conductors for which Ohm’s law holds called?**

(a) Ohmic conductors

(b) Non-ohmic conductors

(c) Superconductors

(d) Semiconductors

## Show Answer

**
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

## Show Answer

**
Linear (straight line)
**

**59. What is the unit of electrical energy?**

(a) Joules (J)

(b) Volts (V)

(c) Amperes (A)

(d) Watts (W)

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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)

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
80 Watts
**

**74. What is the SI unit for electrical power?**

(a) Volt (V)

(b) Ampere (A)

(c) Joule (J)

(d) Watt (W)

## Show Answer

**
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)

## Show Answer

**
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

## Show Answer

**
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)

## Show Answer

**
Kilowatt-hours (kWh)
**

**78. 1 kWh is equal to:**

(a) 1000 watts

(b) 1 joule

(c) 3600 seconds

(d) 3.6 × 106 joules

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
Fuse
**

**82. A device that allows or blocks the flow of current:**

(a) Resistor

(b) Capacitor

(c) Switch

(d) Lamp

## Show Answer

**
Switch
**

**83. A device that is used to detect very small currents and voltages:**

(a) Galvanometer

(b) Ammeter

(c) Voltmeter

(d) Oscilloscope

## Show Answer

**
Galvanometer
**

**84. Which instrument is used for measuring current in a circuit?**

(a) Galvanometer

(b) Voltage meter

(c) Ammeter

(d) Resistance meter

## Show Answer

**
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

## Show Answer

**
In series
**

**86. The resistance of an ammeter is kept:**

(a) High

(b) Low

(c) Variable

(d) None of these

## Show Answer

**
Low
**

**87. Which instrument is used for measuring potential difference in a circuit?**

(a) Galvanometer

(b) Ammeter

(c) Voltmeter

(d) Resistance meter

## Show Answer

**
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

## Show Answer

**
In parallel
**

**89. The resistance of a voltmeter is typically kept:**

(a) High

(b) Low

(c) Variable

(d) None of these

## Show Answer

**
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

## Show Answer

**
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)

## Show Answer

**
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)

## Show Answer

**
Alternating current (AC)
**

**93. Which of the following can produce both DC and AC?**

(a) Electric generators

(b) Ammeters

(c) Resistors

(d) Capacitors

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
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

## Show Answer

**
Circuit breakers
**

**100. What is the typical resistance of dry skin?**

(a) About 1000 ohms

(b) About 240 ohms

(c) About 10,000 ohms

(d) About 24 ohms

## Show Answer

**
About 10,000 ohms
**

**101. How much current can cause death in some cases?**

(a) 1 mA

(b) 10 mA

(c) 100 mA

(d) 1.5 mA

## Show Answer

**
100 mA
**

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