Looking for Class 8 Science Chapter 4 Electricity: Magnetic and Heating Effects MCQs with Answers? You are in the right place. This page is designed for students who want to revise the chapter quickly and check their understanding through multiple-choice questions. Instead of reading long notes before practice, you can directly solve MCQs and improve your confidence for school exams.
These Class 8 MCQs are prepared according to the latest CBSE Board syllabus and follow the concepts explained in the NCERT textbook. Whether you are revising before a class test, unit test, half-yearly exam, or annual examination, these questions will help you identify your strengths and the topics that need more practice.
If you regularly practice Class 8 Science MCQs, you can improve your concept clarity, increase your speed, and make fewer mistakes during exams. Read every question carefully, think before choosing your answer, and use this page as a quick revision resource whenever you study Chapter 4.
Class 8 Science Chapter 4 Electricity: Magnetic and Heating Effects MCQs with Answers
Practice these Class 8 Science Chapter 4 Electricity: Magnetic and Heating Effects MCQs with Answers for quick revision and exam preparation. The questions are based on the latest CBSE syllabus and NCERT concepts to help you improve your understanding and confidence.
Level 1: Concept Check
This section focuses on the basic ideas of the chapter. It helps students remember important definitions, identify electrical devices, and understand how electricity produces heating and magnetic effects. If you are studying this chapter for the first time, begin with these questions.
Q. Which of the following materials is a good conductor of electricity?
A. Rubber
B. Wood
C. Copper
D. Plastic
Answer:C. Copper
Explanation: Copper allows electric current to pass through it easily, so it is widely used in electrical wiring.
Q. What is the main purpose of using a fuse in an electrical circuit?
A. To increase the flow of current
B. To store electrical energy
C. To protect the circuit from excessive current
D. To produce heat
Answer:C. To protect the circuit from excessive current
Explanation: A fuse melts when too much current flows through it, protecting electrical appliances and wiring.
Q. Which appliance mainly works because of the heating effect of electric current?
A. Compass
B. Electric heater
C. Bicycle bell
D. Magnet
Answer:B. Electric heater
Explanation: An electric heater converts electrical energy into heat using its heating element.
Q. What happens around a wire when electric current flows through it?
A. The wire changes its colour.
B. A magnetic field is produced around the wire.
C. The wire starts producing sound.
D. The wire becomes an insulator.
Answer:B. A magnetic field is produced around the wire.
Explanation: A current-carrying wire creates a magnetic field around it. This is called the magnetic effect of electric current.
Q. Which material is commonly used to make the heating element of an electric iron or heater?
A. Aluminium
B. Plastic
C. Nichrome
D. Copper
Answer:C. Nichrome
Explanation: Nichrome has high resistance and a high melting point, making it suitable for heating elements.
Q. An electromagnet works only when:
A. It is kept in sunlight.
B. Electric current flows through it.
C. It is cooled with water.
D. It is painted.
Answer:B. Electric current flows through it.
Explanation: An electromagnet becomes magnetic only while electric current passes through its coil.
Q. Which device uses an electromagnet to perform its function?
A. Torch
B. Candle
C. Electric bell
D. Mirror
Answer:C. Electric bell
Explanation: An electric bell uses an electromagnet to attract the striker and produce sound.
Q. Which of the following is an electrical safety device?
A. Switch
B. Battery
C. Fuse
D. Bulb
Answer:C. Fuse
Explanation: A fuse protects electrical circuits by breaking the circuit during overload or short circuit.
Q. Which material is commonly used to cover electrical wires for safety?
A. Iron
B. Copper
C. Aluminium
D. Rubber
Answer:D. Rubber
Explanation: Rubber is a good insulator and helps protect people from electric shocks.
Q. Which statement best describes the heating effect of electric current?
A. Electric current produces heat when it flows through a conductor.
B. Electric current changes a conductor into a magnet permanently.
C. Electric current produces sound in every wire.
D. Electric current changes the colour of electrical wires.
Answer:A. Electric current produces heat when it flows through a conductor.
Explanation: The heating effect of electric current is used in appliances such as electric irons, heaters, and toasters to generate heat.
Level 2: Application Practice
After understanding the basics, practice questions that connect science with everyday life. These questions test whether you can apply concepts to situations involving electric bells, heaters, fuses, electromagnets, and household electrical appliances.
Q. A student brings a compass close to a wire carrying electric current. What is the most likely observation?
A. The wire starts melting.
B. The compass needle moves from its usual position.
C. The compass stops working permanently.
D. Nothing happens to the compass.
Answer:B. The compass needle moves from its usual position.
Explanation: A current-carrying wire creates a magnetic field, causing the compass needle to deflect.
Q. Why are the handles of electric irons made of plastic?
A. Plastic is heavier than iron.
B. Plastic is a good conductor of electricity.
C. Plastic prevents electric shock and reduces the transfer of heat to the hand.
D. Plastic increases the heating effect.
Answer:C. Plastic prevents electric shock and reduces the transfer of heat to the hand.
Explanation: Plastic is an insulator, so it protects users from heat and electric shock.
Q. Which appliance mainly uses the heating effect of electric current to perform its function?
A. Electric toaster
B. Electric bell
C. Compass
D. Loudspeaker
Answer:A. Electric toaster
Explanation: An electric toaster uses a heating element that becomes hot when electric current flows through it.
Q. Why is nichrome commonly used to make heating elements?
A. It has low resistance.
B. It produces heat efficiently and can withstand high temperatures.
C. It is a poor conductor of electricity.
D. It melts very easily.
Answer:B. It produces heat efficiently and can withstand high temperatures.
Explanation: Nichrome has high resistance and a high melting point, making it suitable for heating appliances.
Q. A school bell rings when the switch is pressed. Which effect of electric current makes this possible?
A. Heating effect
B. Chemical effect
C. Sound effect
D. Magnetic effect
Answer:D. Magnetic effect
Explanation: An electric bell works with an electromagnet, which is formed when electric current flows through a coil.
Q. What could happen if a fuse is replaced with a thick copper wire?
A. The circuit becomes more secure.
B. The fuse works more effectively.
C. Electrical appliances may get damaged during an overload.
D. Electricity consumption reduces.
Answer:C. Electrical appliances may get damaged during an overload.
Explanation: A copper wire does not melt quickly like a fuse wire, so it cannot protect the circuit from excessive current.
Q. Which situation is the best example of the magnetic effect of electric current?
A. An electric kettle heating water
B. An electromagnet lifting iron pieces
C. A room heater warming the air
D. An electric iron pressing clothes
Answer:B. An electromagnet lifting iron pieces
Explanation: Electromagnets work because electric current produces a magnetic field.
Q. During an electrical overload at home, which device helps protect electrical appliances?
A. Battery
B. Electric bulb
C. Electric bell
D. Fuse
Answer:D. Fuse
Explanation: A fuse melts when too much current flows, breaking the circuit and protecting appliances.
Q. Why are electric wires covered with rubber or plastic?
A. To increase the flow of electric current
B. To improve the magnetic effect of the wire
C. To prevent electric shock by providing insulation
D. To make the wires stronger
Answer:C. To prevent electric shock by providing insulation
Explanation: Rubber and plastic are good insulators that help prevent accidental electric shocks.
Q. Which everyday situation shows the heating effect of electric current?
A. A refrigerator door closing automatically
B. A magnet attracting iron nails
C. An electric room heater warming the room
D. A compass pointing towards the north
Answer:C. An electric room heater warming the room
Explanation: An electric room heater converts electrical energy into heat using the heating effect of electric current.
Level 3: Exam Practice
This section is designed to prepare you for school examinations. The questions may require careful thinking, concept-based reasoning, and the ability to compare different ideas from the chapter. Solving these questions will help improve your accuracy and confidence during exams.
Q. A current-carrying wire is wrapped around an iron nail. Why is the iron nail used?
A. To stop the flow of electricity
B. To increase the strength of the magnetic field
C. To reduce the current in the wire
D. To produce light
Answer:B. To increase the strength of the magnetic field
Explanation: The iron nail acts as the core of an electromagnet and makes the magnetic field much stronger.
Q. Which pair of appliances mainly works because of the heating effect of electric current?
A. Electric bell and compass
B. Electric iron and electric toaster
C. Compass and electromagnet
D. Electric fan and electric bell
Answer:B. Electric iron and electric toaster
Explanation: Both appliances convert electrical energy into heat to perform their function.
Q. Rahul notices that the compass needle moves when it is brought close to a wire carrying electric current. What does this show?
A. Electricity produces heat.
B. Electricity produces light.
C. Electric current creates a magnetic field.
D. The wire has become hot.
Answer:C. Electric current creates a magnetic field.
Explanation: The movement of the compass needle shows that a magnetic field is present around the current-carrying wire.
Q. Why is nichrome used instead of copper in electric heaters?
A. Nichrome is a better insulator.
B. Nichrome has high resistance and can withstand high temperatures.
C. Nichrome is cheaper than copper.
D. Nichrome conducts electricity better than copper.
Answer:B. Nichrome has high resistance and can withstand high temperatures.
Explanation: Nichrome produces more heat because of its high resistance and does not melt easily.
Q. A family plugs several appliances into one extension board at the same time. Which device helps protect the circuit if too much current flows?
A. Electric switch
B. Electric bulb
C. Battery
D. Fuse
Answer:D. Fuse
Explanation: A fuse melts when excessive current flows, preventing damage to the electrical circuit and appliances.
Q. What happens to an electromagnet when the electric current is switched off?
A. It becomes a permanent magnet.
B. It starts producing heat.
C. It loses its magnetic property.
D. Its magnetic force becomes stronger.
Answer:C. It loses its magnetic property.
Explanation: An electromagnet works only while electric current flows through its coil.
Q. Which option correctly matches the device with the effect of electric current it mainly uses?
A. Electric bell - Heating effect
B. Electric heater - Magnetic effect
C. Electric bell - Magnetic effect
D. Compass - Heating effect
Answer:C. Electric bell - Magnetic effect
Explanation: An electric bell uses an electromagnet, which works due to the magnetic effect of electric current.
Q. Which of the following is the safest practice while using electrical appliances?
A. Pull the plug by its wire.
B. Replace a fuse with a thick copper wire.
C. Touch electrical switches with wet hands.
D. Keep electrical appliances away from water.
Answer:D. Keep electrical appliances away from water.
Explanation: Water conducts electricity and can increase the risk of electric shock.
Q. Which statement correctly describes the role of a fuse?
A. It stores electrical energy for later use.
B. It protects the circuit by breaking it during excess current.
C. It increases the current flowing through the circuit.
D. It acts as the heating element in electrical appliances.
Answer:B. It protects the circuit by breaking it during excess current.
Explanation: A fuse melts when too much current flows, protecting electrical appliances and wiring from damage.
Q. Why is it important to learn both the heating effect and the magnetic effect of electric current?
A. These topics are useful only for science experiments.
B. They are not included in school examinations.
C. Many electrical appliances work using these effects.
D. They are needed only for solving numerical questions.
Answer:C. Many electrical appliances work using these effects.
Explanation: Everyday devices such as electric irons, heaters, electric bells, and electromagnets work based on these effects of electric current, making them important for both exams and daily life.
Important Topics Covered
Before solving the MCQs, it is helpful to know the main concepts covered in this chapter. These topics are important for both classroom learning and CBSE examinations.
- Electric current and simple electric circuits
- Heating effect of electric current
- Everyday uses of the heating effect of electricity
- Heating elements used in electrical appliances
- Why nichrome is used in heating devices
- Magnetic effect of electric current
- Electromagnets and their working
- Construction and working of an electric bell
- Electric fuse and its importance
- Conductors and insulators
- Electrical safety at home and in school
- Common uses of electricity in daily life
A clear understanding of these topics will make it much easier to answer objective questions correctly and score better in examinations.
Common Mistakes Students Should Avoid
Many students lose marks because of small misunderstandings rather than difficult questions. Avoiding these common mistakes can improve your exam performance.
- Do not confuse the heating effect and magnetic effect of electric current.
- Remember the purpose of a fuse.
- Do not forget why nichrome is used.
- Understand how an electromagnet works.
- Read every option carefully.
- Revise diagrams and practical applications.
- Practice regularly instead of memorising answers.
