Class 8 Science — Chapter 4: Electricity: Magnetic and Heating Effects
72 practice questions · 24 Easy · 24 Medium · 24 Hard
Practise the most important Class 8 Science questions from Chapter 4, "Electricity: Magnetic and Heating Effects" — 72 NCERT-aligned multiple-choice questions with answers and explanations. The set is split into 24 Easy, 24 Medium and 24 Hard, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams.
"Electricity: Magnetic and Heating Effects" is one of the chapters where concept clarity across physics, chemistry and biology basics really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+4 correct, −1 wrong, 0 skipped), training the same negative-marking accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Electricity: Magnetic and Heating Effects, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 8 Science mastery score. A sample question is shown below; sign in free to see its answer and practise all 72.
Key concepts: Electricity: Magnetic and Heating Effects (Class 8 Science)
This chapter shows that an electric current does more than light a bulb — it has a magnetic effect and a heating effect. A current-carrying wire deflects a compass needle, which is how Oersted discovered that current creates a magnetic field. Winding the wire into a coil (with a soft iron core) makes an electromagnet whose strength grows with more turns and more current. Current also heats a conductor because of its resistance — the heating effect — which runs heaters, irons and bulbs, while the magnetic effect runs bells and motors.
- Electric current and circuit
- Electric current is the flow of charge around a closed circuit made of a cell, connecting wires, a switch and a component such as a bulb or LED.
- Conductor and insulator
- A conductor (like copper) lets current flow easily; an insulator (like plastic) does not, so it is used to cover wires safely.
- Magnetic effect of current
- A current-carrying wire deflects a nearby compass needle, showing that the current produces a magnetic field around itself — discovered by Hans Christian Oersted.
- Magnetic field
- The region around a current-carrying wire where the magnetic effect can be felt, for example by the deflection of a compass needle.
Try a sample question
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A wire heats up when current flows because the current faces:
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See the answer and solution to this question, then practise all 72 questions (24 Easy · 24 Medium · 24 Hard) with timed scoring and instant feedback, plus the complete key-concept notes, formulas & exam tips. Sign in with Google — no card needed.
Start this chapter free →Electricity: Magnetic and Heating Effects — FAQs
What are the key concepts in Class 8 Science Electricity: Magnetic and Heating Effects?+
This chapter shows that an electric current does more than light a bulb — it has a magnetic effect and a heating effect. A current-carrying wire deflects a compass needle, which is how Oersted discovered that current creates a magnetic field. Winding the wire into a coil (with a soft iron core) makes an electromagnet whose strength grows with more turns and more current. Current also heats a conductor because of its resistance — the heating effect — which runs heaters, irons and bulbs, while the magnetic effect runs bells and motors. Key ideas include Electric current and circuit, Conductor and insulator, Magnetic effect of current, Magnetic field.
What does Class 8 Science Chapter 4 (Electricity: Magnetic and Heating Effects) cover on XamBaaz?+
It covers 72 NCERT-aligned MCQs on "Electricity: Magnetic and Heating Effects" — 24 Easy, 24 Medium and 24 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams.
Are these "Electricity: Magnetic and Heating Effects" questions free to practise?+
Yes — sign in with Google to practise "Electricity: Magnetic and Heating Effects" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Electricity: Magnetic and Heating Effects" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
Are these "Electricity: Magnetic and Heating Effects" MCQs available with answers?+
Yes. This page shows one sample question so you can see the format; sign in free with Google to reveal the correct option and a step-by-step "Why" explanation for it, then practise all 72 questions with instant scoring.
Is there negative marking in the "Electricity: Magnetic and Heating Effects" quizzes?+
Yes — the timed quizzes use exam-grade marking: +4 for a correct answer, −1 for a wrong one and 0 for a skipped question, so you practise the same negative-marking discipline as CBSE Board exams.
Are these important questions for Electricity: Magnetic and Heating Effects?+
The set is curated to the NCERT syllabus and weighted toward the question patterns that actually appear in CBSE Board exams, across Easy, Medium and Hard — so it doubles as an "important questions" revision list for "Electricity: Magnetic and Heating Effects".