Electricity: Magnetic and Heating Effects Class 8 MCQs Science Chapter 4

Electricity is one of the most important forms of energy used in our daily life. We use electricity to light our homes, run fans, charge mobile phones, operate computers, cook food, and use many electrical appliances. In Class 8 Science Chapter 4, Electricity: Magnetic and Heating Effects, students learn how electric current produces heat and magnetism.

This chapter helps students understand important concepts such as electric circuits, conductors, insulators, heating effect, electric fuse, MCB, magnetic effect, electromagnets, and electric bells. Practicing Electricity: Magnetic and Heating Effects Class 8 MCQs Science Chapter 4 helps students revise quickly and prepare better for school exams, quizzes, and Olympiads.

NCERT MCQ for Class 8 Science Curiosity Chapter 4 Electricity: Magnetic and Heating Effects

NCERT MCQ Solutions for Class 8 Science Curiosity Chapter 4, Electricity: Magnetic and Heating Effects, are updated for the 2026-27 academic session. These simple question-and-answer sets help students understand the chapter in an easy and clear way.

The Class 8 Science MCQs cover important topics such as the magnetic effect of electric current, the heating effect of current, electric circuits, wires, batteries, fuses, and electrical safety. By practicing these questions, students can check their understanding, revise key concepts, and prepare confidently for CBSE board exams.

Download Class 8 Science Chapter 4 MCQ with Answers PDF

Class 8 Electricity: Magnetic and Heating Effects MCQ with Answers

1. What is electricity?

a) Flow of water

b) Flow of electric charge

c) Flow of air

d) Flow of heat

Answer: b) Flow of electric charge

2. Electric current flows through:

a) Insulators

b) Conductors

c) Plastic

d) Rubber

Answer: b) Conductors

3. Which material is a good conductor of electricity?

a) Wood

b) Rubber

c) Copper

d) Plastic

Answer: c) Copper

4. Which of the following is an insulator?

a) Aluminium

b) Iron

c) Copper

d) Rubber

Answer: d) Rubber

5. A complete path through which electric current flows is called:

a) Electric bulb

b) Electric circuit

c) Electric switch

d) Electric wire

Answer: b) Electric circuit

6. In a closed circuit, electric current:

a) Does not flow

b) Flows continuously

c) Stops completely

d) Flows only through plastic

Answer: b) Flows continuously

Also Read: Class 8 chapter 1 mcq science with answers

7. In an open circuit, the bulb:

a) Glows brightly

b) Glows dimly

c) Does not glow

d) Bursts immediately

Answer: c) Does not glow

8. Which device is used to open and close an electric circuit?

a) Switch

b) Bulb

c) Wire

d) Fuse

Answer: a) Switch

9. A battery is made up of:

a) One or more bulbs

b) Two or more cells

c) Only wires

d) Only switches

Answer: b) Two or more cells

10. The device that converts electrical energy into light energy is:

a) Cell

b) Bulb

c) Switch

d) Fuse

Answer: b) Bulb

11. The heating effect of electric current means:

a) Current produces sound

b) Current produces heat

c) Current produces water

d) Current produces air

Answer: b) Current produces heat

12. Which appliance works on the heating effect of electric current?

a) Electric bell

b) Electric iron

c) Loudspeaker

d) Compass

Answer: b) Electric iron

13. Which of the following uses the heating effect of current?

a) Toaster

b) Electric bell

c) Magnetic compass

d) Microphone

Answer: a) Toaster

14. Electric heater converts electrical energy into:

a) Sound energy

b) Heat energy

c) Light only

d) Chemical energy

Answer: b) Heat energy

Also Read: Class 8 chapter 2 mcq science with answers

15. The wire used in heating appliances usually has:

a) Low resistance

b) High resistance

c) No resistance

d) No current

Answer: b) High resistance

16. The property that opposes the flow of current is called:

a) Voltage

b) Resistance

c) Magnetism

d) Reflection

Answer: b) Resistance

17. More resistance in a wire generally produces:

a) More heat

b) Less heat always

c) No heat

d) Water

Answer: a) More heat

18. An electric fuse is a:

a) Heating appliance

b) Safety device

c) Type of battery

d) Type of bulb

Answer: b) Safety device

19. A fuse protects an electric circuit from:

a) Bright light

b) Overloading

c) Fresh air

d) Clean water

Answer: b) Overloading

20. Fuse wire melts due to:

a) Cooling effect

b) Heating effect

c) Magnetic effect

d) Sound effect

Answer: b) Heating effect

21. Fuse wire is made of a material having:

a) Very high melting point

b) Low melting point

c) No melting point

d) Magnetic property only

Answer: b) Low melting point

22. A fuse is connected in:

a) Parallel with the appliance

b) Series with the circuit

c) Water pipe

d) Open air

Answer: b) Series with the circuit

23. MCB stands for:

a) Main Circuit Battery

b) Miniature Circuit Breaker

c) Magnetic Current Box

d) Metal Circuit Board

Answer: b) Miniature Circuit Breaker

24. Which safety device can be switched on again after tripping?

a) Fuse

b) MCB

c) Bulb

d) Cell

Answer: b) MCB

25. Overloading occurs when:

a) Very few appliances are used

b) Too many appliances are connected to one socket

c) No current flows

d) Switch is off

Answer: b) Too many appliances are connected to one socket

26. A short circuit occurs when:

a) Live and neutral wires touch each other

b) Switch is opened

c) Battery is removed

d) Bulb is disconnected

Answer: a) Live and neutral wires touch each other

27. The magnetic effect of electric current means:

a) Current produces magnetic field

b) Current produces only heat

c) Current produces only light

d) Current stops flowing

Answer: a) Current produces magnetic field

28. A current-carrying wire behaves like a:

a) Rubber band

b) Magnet

c) Wooden stick

d) Plastic rod

Answer: b) Magnet

29. Who discovered the magnetic effect of electric current?

a) Isaac Newton

b) Hans Christian Oersted

c) Albert Einstein

d) Galileo Galilei

Answer: b) Hans Christian Oersted

30. In Oersted’s experiment, a compass needle gets:

a) Burnt

b) Deflected

c) Melted

d) Broken

Answer: b) Deflected

Also Read: Class 8 chapter 4 mcq science with answers

31. A magnetic field is produced around:

a) A current-carrying wire

b) A wooden table

c) A plastic bottle

d) A glass rod only

Answer: a) A current-carrying wire

32. An electromagnet is:

a) A permanent magnet

b) A temporary magnet made using electric current

c) A wooden magnet

d) A plastic magnet

Answer: b) A temporary magnet made using electric current

33. An electromagnet is usually made by winding wire around:

a) Iron nail

b) Plastic pen

c) Wooden stick

d) Glass tube

Answer: a) Iron nail

34. The core of an electromagnet is usually made of:

a) Rubber

b) Wood

c) Soft iron

d) Plastic

Answer: c) Soft iron

35. When current is switched off, an electromagnet:

a) Becomes stronger

b) Loses its magnetism

c) Turns into plastic

d) Starts glowing

Answer: b) Loses its magnetism

36. The strength of an electromagnet can be increased by:

a) Reducing number of turns

b) Increasing number of turns of wire

c) Using plastic core

d) Removing the battery

Answer: b) Increasing number of turns of wire

37. Which device uses an electromagnet?

a) Electric bell

b) Electric iron

c) Toaster

d) Electric kettle

Answer: a) Electric bell

38. Electromagnets are used in cranes to lift:

a) Plastic bags

b) Iron objects

c) Paper sheets

d) Wooden boxes

Answer: b) Iron objects

39. Electric bell works on:

a) Heating effect of current

b) Magnetic effect of current

c) Cooling effect of current

d) Chemical effect only

Answer: b) Magnetic effect of current

40. The part of an electric bell that strikes the gong is:

a) Hammer

b) Battery

c) Fuse

d) Switch

Answer: a) Hammer

41. The electromagnet in an electric bell attracts the:

a) Gong

b) Armature

c) Battery

d) Wire cover

Answer: b) Armature

42. Which part produces sound in an electric bell?

a) Gong

b) Cell

c) Fuse

d) Insulator

Answer: a) Gong

43. Which of the following is a safety rule while using electricity?

a) Touch switches with wet hands

b) Use damaged wires

c) Do not overload sockets

d) Insert objects into sockets

Answer: c) Do not overload sockets

44. We should not touch electrical appliances with wet hands because:

a) Water is a good conductor

b) Water is always an insulator

c) It saves electricity

d) It increases light

Answer: a) Water is a good conductor

45. The covering of electric wires is usually made of:

a) Copper

b) Rubber or plastic

c) Iron

d) Aluminium

Answer: b) Rubber or plastic

46. Rubber covering on wires helps to:

a) Increase shock risk

b) Prevent electric shock

c) Produce more heat

d) Make current stop always

Answer: b) Prevent electric shock

47. Which of the following should be replaced immediately?

a) New wire

b) Damaged wire

c) Insulated wire

d) Dry switch

Answer: b) Damaged wire

48. Which appliance mainly uses the heating effect of current?

a) Electric kettle

b) Electric bell

c) Magnetic crane

d) Loudspeaker

Answer: a) Electric kettle

49. Which effect of current is used in making an electromagnet?

a) Heating effect

b) Magnetic effect

c) Cooling effect

d) Freezing effect

Answer: b) Magnetic effect

50. Why should students practice Electricity: Magnetic and Heating Effects MCQs?

a) To revise concepts and prepare for exams

b) To avoid reading the chapter

c) To memorize without understanding

d) To skip Science practice

Answer: a) To revise concepts and prepare for exams

Tips to Prepare for Class 8 Science MCQs Ch 4 Electricity: Magnetic and Heating Effects

Class 8 Science Chapter 4, Electricity: Magnetic and Heating Effects, includes important concepts like electric circuits, conductors, insulators, heating effect, magnetic effect, fuse, MCB, electromagnets, and electric bells. To score well in class 8 MCQs, students should focus on understanding concepts with examples rather than only memorizing answers.

• Read the chapter carefully- Understand each topic from the NCERT Class 8 textbook before solving MCQs.
• Learn important definitions- Revise terms like electric current, circuit, conductor, insulator, fuse, MCB, electromagnet, and short circuit.
• Understand open and closed circuits- Know when current flows and when the bulb glows or does not glow.
• Make a table of conductors and insulators- Example: Copper and aluminium are conductors, while rubber, plastic, and wood are insulators.
• Focus on heating effect examples- Learn appliances like electric iron, heater, toaster, kettle, geyser, and hair dryer.
• Understand fuse and MCB properly- Know how they protect circuits from overloading and short circuits.
• Revise magnetic effect of current- Remember that a current-carrying wire behaves like a magnet.
• Learn Oersted’s experiment- Understand why the compass needle deflects near a current-carrying wire.
• Practice electromagnet questions- Learn how an electromagnet is made and what increases its strength.
• Understand electric bell working- Revise the role of electromagnet, armature, hammer, gong, and contact screw.
• Study electrical safety rules- Remember safety points like avoiding wet hands, damaged wires, and overloaded sockets.
• Practice MCQs daily- Solve chapter-wise MCQs to improve speed, accuracy, and confidence.
• Review wrong answers- Check mistakes and revise the related concept again.
• Use diagrams for revision- Practice simple circuit diagrams and electric bell diagrams for better understanding.
• Attempt online tests and PDFs- Use practice PDFs and online MCQ tests to prepare better for school exams and quizzes.