CTET · Study & Practice

How Things Work — Electricity & Magnets (VI–VIII)

AreaScience & Pedagogy DifficultyEasy to Moderate CTET weightage2–4 questions from the "How Things Work" unit in CTET Paper II Science (content + a pedagogy item)

The CTET Paper II Science syllabus groups electricity and magnetism under the theme 'How Things Work' for Classes VI–VIII, and it is one of the most predictable scoring areas in the paper. The content stays at upper-primary level — a torch bulb, a dry cell, a switch, a bar magnet, a compass — but CTET wraps it in a classroom situation: a bulb that won't glow, a child who thinks a magnet attracts everything, a teacher choosing an activity to teach conductors. So you need two things at once: the physics has to be airtight, and you have to know how children typically misunderstand it. I've taught this unit enough times to know exactly where learners trip — they leave a gap in the circuit and wonder why nothing happens, they believe the bigger magnet must be 'stronger' at everything, they try to make a magnet with a single north pole. This chapter nails the science of current and circuits, conductors and insulators, the effects of an electric current, and the properties of magnets — and pairs every concept with the misconception CTET loves to test.

Topics

1 Electric Current & Circuits 4 worked · 4 practice · 8-Q MCQ test Start → 2 Conductors, Insulators & Effects of Current 4 worked · 4 practice · 8-Q MCQ test Start → 3 Magnets & Their Properties 4 worked · 4 practice · 8-Q MCQ test Start →

⚡ Smart tips & memory hooks

Memory hooks and exam-smart tips to lock this chapter in and answer CTET MCQs quickly and accurately.

  • Bulb won’t glow? Look for a GAP: switch off, loose/broken wire, or fused filament = open circuit = no current.
  • Conductor = metal (copper/aluminium) + body + tap water. Insulator = rubber, plastic, wood, glass, air. Wire = conductor core + insulator sheath.
  • Three effects of current — "H-M-C": Heating (heater/iron), Magnetic (electromagnet/compass deflection), Chemical (electroplating).
  • Pole rule: LIKE poles REPEL, UNLIKE poles ATTRACT. Repulsion is the SURE test of a magnet.
  • A freely suspended magnet always points North–South (directive property) → this is how a compass works.
  • Break a magnet and you still get TWO poles in each piece — a single isolated pole is impossible.

⚠️ Common mistakes & traps

CTET loves to test these exact confusions. Internalise each trap before exam day.

  • Thinking one wire from a single terminal can light a bulb — current needs a COMPLETE closed loop.
  • Believing a magnet attracts ALL metals — it does NOT attract copper, aluminium, gold or silver; only iron, nickel, cobalt, steel.
  • Expecting a broken magnet to give one separate North piece and one South piece — each piece has BOTH poles.
  • Treating attraction as proof of a magnet — only REPULSION proves it; iron is attracted but is not a magnet.
  • Saying pure/distilled water conducts well — it is tap water (with dissolved salts) that conducts; that is also why wet hands + switches are dangerous.
  • Confusing the three effects — heating ≠ magnetic ≠ chemical; match heater→heating, electromagnet→magnetic, electroplating→chemical.

📈 CTET exam insight & PYQ analysis

In CTET Paper II Science, the 'How Things Work' unit reliably yields a couple of direct content questions plus an occasional pedagogy item. The most frequent patterns: the failed-bulb / open-vs-closed circuit scenario; sorting materials into conductors and insulators (and why wires are insulated); naming the three effects of current (heating, magnetic, chemical) from an example; and magnet questions on the like-repel/unlike-attract rule, the two-poles-always property of a broken magnet, the directive property behind the compass, and which materials are magnetic. Pedagogy items ask for the best hands-on activity (build-a-circuit, the magnet sorting tray, the conductor tester) and how to surface and correct children's misconceptions (magnet attracts every metal; a single wire lights a bulb).

🎴 Flashcards — instant recall

Tap a card to reveal the answer. Drill these until they are automatic.

When does current flow in a circuit?Tap to reveal
Only when the circuit is closed (a complete, unbroken loop)
What is a battery?Tap to reveal
Two or more electric cells joined together
Give two common conductors and two insulators.Tap to reveal
Conductors: copper, iron (metals). Insulators: rubber, plastic
Why is an electrical wire coated with plastic?Tap to reveal
Plastic is an insulator; it stops current reaching our hands and prevents shocks
Name the three effects of electric current.Tap to reveal
Heating, magnetic and chemical effects
How many poles does every magnet have?Tap to reveal
Exactly two — a North pole and a South pole
State the pole rule.Tap to reveal
Like poles repel; unlike poles attract
What is the surest test that an object is a magnet?Tap to reveal
Repulsion — a magnet repels a like pole (attraction alone is not proof)
Which way does a freely suspended magnet point, and why does it matter?Tap to reveal
North–South (directive property) — the basis of the magnetic compass
Which materials are attracted by a magnet?Tap to reveal
Iron, nickel, cobalt and steel (magnetic materials)
If you break a bar magnet in half, what do you get?Tap to reveal
Two complete magnets, each with its own North and South pole
A common child misconception about magnets?Tap to reveal
That a magnet attracts all metals — it does NOT attract copper, aluminium, gold or silver

📌 Quick revision

Electricity: a cell (two terminals; cells joined = a battery) drives a current, which flows only in a closed circuit; any gap — switch off, loose wire, fused bulb — opens the circuit and the bulb goes dark. Conductors (metals, the body, tap water) let current pass; insulators (rubber, plastic, wood, glass) block it, which is why wires have a metal core in a plastic sheath. An electric current has three effects — heating, magnetic and chemical. Magnets: every magnet has two inseparable poles; like poles repel and unlike attract (repulsion is the sure test); a freely suspended magnet points North–South (the compass principle); and iron, nickel and cobalt are the magnetic materials. Teach all of this hands-on — build circuits, test materials, sort objects with a magnet — and use children's predictable misconceptions (a single wire lights a bulb; a magnet attracts every metal; a broken magnet gives a single pole) as the teaching opportunity.

Chapter test

📝 How Things Work — Electricity & Magnets (VI–VIII) — Chapter Test
25 fresh questions · timed · full solutions
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📚 Want the full concept lesson?

This chapter gives you the CTET-focused recap, pedagogy and exam-style practice. For the underlying concept taught step by step — worked from the ground up with diagrams — open the matching lesson in our school Maths course.

🔗 See the full lesson in our Class 6–8 Science course
Optional deep-dive · full Class 6–8 teaching · diagrams & worked steps
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🏆 Vidaara CTET success checklist

You have truly mastered How Things Work — Electricity & Magnets (VI–VIII) when you can tick every box below.

  • Recall every formula in this chapter without looking them up
  • Solve each topic’s practice set with at least 80% accuracy
  • Use the chapter shortcuts to cut your solving time in half
  • Spot and avoid every common trap listed above
  • Score 80%+ on the timed chapter test

📋 Chapter mastery scorecard

Track where you stand. Aim for the target before moving to the next chapter.

Skill checkpointTarget
Concept theory & formulas understood100%
Topic practice sets attempted (3 topics)3/3
Best topic-test score— → 80%+
Chapter test score— → 80%+
Flashcards drilled to instant recall12 cards