Science 4 · Unit 6: Electricity · Cambridge Primary Science Stage 4

Questions

1. 1. What is pure water?

   • water with nothing else dissolved in it
   • water from the tap
   • water with salt in it
   • sea water
   Check

2. 2. How is tap water different from pure water?

   • It is a solid.
   • It is always hot.
   • It has no particles.
   • It has salts dissolved in it.
   Check

3. 3. Why is tap water able to conduct electricity?

   • It comes through pipes.
   • It is pure water.
   • It has salts dissolved in it.
   • It is cold.
   Check

4. 4. Does tap water conduct electricity?

   • Yes
   • No
   Check

5. 5. True or false: Plants, animals and humans can conduct electricity.

   • True
   • False
   Check

6. 6. Why can plants, animals and humans conduct electricity?

   • They contain water with salts dissolved in it.
   • They are made of metal.
   • They are always dry.
   • They are made of plastic.
   Check

7. 7. Why should kitchen workers never use electric stoves with wet hands?

   • Wet hands make the stove too hot.
   • Water conducts electricity, so they could get an electric shock.
   • The water will put out the stove.
   • Wet hands are too slippery to cook.
   Check

8. 8. Which safety sign would be best for a restaurant kitchen?

   • Wet hands make cooking safer.
   • Splash water on stoves to cool them down.
   • Always wash your hands before touching plugs.
   • Never touch electric appliances with wet hands!
   Check

9. 📖 This question is about a text that students read in the app.

   9. What was Jawad like when he got home from his run?

   • cold and dry
   • wet from the rain
   • very hot and sweaty
   • asleep
   Check

10. 📖 This question is about a text that students read in the app.

    10. What did Jawad do first when he got home?

    • He turned on the electric fan.
    • He drank water.
    • He had a shower.
    • He went to sleep.
    Check

11. 📖 This question is about a text that students read in the app.

    11. Which part of the fan did Jawad touch?

    • bare connecting wire, where the plastic insulation had worn away
    • the plastic base of the fan
    • the fan blades, which were switched off
    • the plastic switch
    Check

12. 📖 This question is about a text that students read in the app.

    12. Jawad touched bare wire where the plastic insulation had worn away. What happened to him?

    • Nothing happened.
    • He got an electric shock.
    • He got cooler.
    • The fan turned off.
    Check

13. 📖 This question is about a text that students read in the app.

    13. Which three factors caused Jawad's shock?

    • He was sweaty, the wire was bare, and the fan was switched on.
    • He had run 20 km, he was thirsty, and the fan was new.
    • He was hot, he was tired, and the fan was plastic.
    • He was dry, the wire was insulated, and the fan was off.
    Check

14. 📖 This question is about a text that students read in the app.

    14. Why did Jawad's sweat make the shock more likely?

    • Sweat is salty water, which conducts electricity.
    • Sweat makes your skin cooler.
    • Sweat is an insulator.
    • Sweat makes the fan go faster.
    Check

15. 📖 This question is about a text that students read in the app.

    15. What was wrong with Jawad's fan?

    • It was made of plastic.
    • It was not switched on.
    • It had no blades.
    • The plastic insulation on the wire had worn away.
    Check