Grade 8Sciencequiz16 questions

Magnets and electromagnets

Grade 8: magnetic fields, Earth's magnetic field and compasses, magnetic materials (iron, nickel, cobalt), electromagnets, making an electromagnet stronger.

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Free to play. Teams answer on one screen; your phone is the remote. No student devices.

Questions

  1. What do we call the area around a magnet where it can push or pull?

    • Magnetic circuit
    • Magnetic field
    • Magnetic shield
    • Magnetic surface
    Show answerMagnetic field

  2. Where are the magnetic field lines of a bar magnet closest together?

    • At the middle
    • At the poles
    • Far from the magnet
    • Only on one side
    Show answerAt the poles

  3. Two north poles placed close together repel each other. (True or false?)

    Show answerTrue

  4. Outside a bar magnet, field lines are drawn pointing from which pole to which?

    • East to west
    • North to north
    • North to south
    • South to north
    Show answerNorth to south

  5. What is a compass needle?

    • A piece of copper
    • A piece of plastic
    • A small magnet
    • A tiny battery
    Show answerA small magnet

  6. Which geographic direction does a compass needle's north-seeking end point to? (Answer out loud)

    Show answerGeographic north

  7. Earth behaves as if it has a giant bar magnet inside it. (True or false?)

    Show answerTrue

  8. Which of these metals is magnetic?

    • Aluminium
    • Copper
    • Gold
    • Nickel
    Show answerNickel

  9. Which list contains only magnetic metals?

    • Cobalt, gold, aluminium
    • Iron, copper, zinc
    • Iron, nickel, cobalt
    • Nickel, silver, tin
    Show answerIron, nickel, cobalt

  10. All metals are attracted to magnets. (True or false?)

    Show answerFalse

  11. What is an electromagnet?

    • A magnet made by electric current
    • A magnet made by heating iron
    • A magnet made from plastic
    • A magnet that needs no energy
    Show answerA magnet made by electric current

  12. Which core is best for a simple electromagnet?

    • A copper nail
    • A plastic rod
    • A wooden stick
    • An iron nail
    Show answerAn iron nail

  13. What happens to an electromagnet when the current is switched off?

    • It becomes stronger
    • It loses its magnetism
    • It turns into iron
    • Its poles swap forever
    Show answerIt loses its magnetism

  14. Which change makes an electromagnet stronger?

    • Fewer turns of wire
    • More turns of wire
    • Using a weaker battery
    • Using a wooden core
    Show answerMore turns of wire

  15. Name one change to the current that makes an electromagnet stronger. (Answer out loud)

    Show answerIncrease the current (more cells or higher voltage)

  16. How can you reverse the poles of an electromagnet? (Answer out loud)

    Show answerReverse the direction of the current (swap battery connections)

Play it as a game

Dare BoardPick a tile first: 1 to 5 points, and the higher the tile, the harder the question. One tile is a Double dare!Prize ClimbAnswer right to climb ten prize steps, then bank your stars or climb on. Three lifelines help.Ring the BellEvery team answers every question. A miss costs a heart; the last team standing rings the bell.High WaterAnswer right to build the class tower 2 floors higher. The sea rises every question: stay dry together!

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