Science 7 · Unit 9: Electricity · Cambridge Lower Secondary Science Stage 7

Questions

1. 1. What does this circuit symbol show?

   • an ammeter
   • a cell
   • an open switch
   • a lamp
   Check

2. 2. In the symbol for a cell, which line is the positive terminal?

   • the longer line
   • the shorter line
   Check

3. 3. What does this circuit symbol show?

   • a lamp
   • a buzzer
   • a cell
   • an ammeter
   Check

4. 4. What does this circuit symbol show?

   • a lamp
   • a cell
   • an ammeter
   • a buzzer
   Check

5. 5. What does this circuit symbol show?

   • a cell
   • a closed switch
   • a lamp
   • an open switch
   Check

6. 6. A circuit has a switch, a lamp and a buzzer in a loop, but no cell. What happens when the switch is closed?

   • Only the buzzer sounds.
   • Nothing, because there is no cell to push the electrons round.
   • The lamp lights and the buzzer sounds.
   • Only the lamp lights.
   Check

7. 7. Which circuit will light the lamp and sound the buzzer when the switch is closed?

   • a complete loop with a cell, a switch, a lamp and a buzzer
   • a loop with a switch, a lamp and a buzzer, but no cell
   • a loop with a cell, a switch and a buzzer only
   • a loop with a cell, a switch and a lamp only
   Check

8. 8. A circuit has a cell, a switch and a buzzer in a loop. What happens when the switch is closed?

   • The buzzer sounds and a lamp lights.
   • Nothing happens.
   • There is light but no sound.
   • The buzzer sounds, but there is no light.
   Check

9. 9. A circuit has a cell, a switch and a lamp in a loop. What happens when the switch is closed?

   • The lamp lights, but there is no sound.
   • There is sound but no light.
   • Nothing happens.
   • The lamp lights and a buzzer sounds.
   Check

10. 10. What is a series circuit?

    • a circuit with no cell
    • a circuit with only one component
    • a circuit where all the components are joined in one loop
    • a circuit with more than one loop
    Check

11. 11. Why does a series circuit need to be a complete loop?

    • so the wires look tidy
    • Electrons can only flow if there is no gap.
    • so the cell does not get hot
    • Electrons can jump across gaps.
    Check

12. 12. Arun draws a series circuit with two cells, two lamps and a switch. How many component symbols does he draw?

    • 4
    • 6
    • 5
    • 3
    Check

13. 13. Circuit A has one cell, a buzzer, a switch and two lamps. Circuit B has two cells, an ammeter, a switch and two lamps. Which is a difference?

    • B has two cells and an ammeter, but no buzzer.
    • B has no switch.
    • B has only one lamp.
    • A has an ammeter.
    Check

14. 14. In circuit A, the switch is drawn with its lever lifted away from the contact. Is it open or closed?

    • open
    • closed
    Check

15. 15. How many differences are there between circuit A and circuit B?

    • 3: B has an extra cell, an ammeter, and no buzzer
    • 4: B has an extra cell, an ammeter, no buzzer, and its switch is closed
    • 1: B has an ammeter
    • 2: B has more lamps and no switch
    Check