Science 8 · Unit 3: Forces and energy · Cambridge Lower Secondary Science Stage 8

Questions

1. 1. What happens to pressure in a liquid as depth increases?

   • It becomes zero.
   • It stays the same.
   • It increases.
   • It decreases.
   Check

2. 2. Where is air pressure largest?

   • at the top of a mountain
   • at the top of the clouds
   • at the top of the atmosphere
   • at sea level
   Check

3. 3. A car tyre gets warmer as the car moves. What happens to the air pressure in it?

   • It increases.
   • It stays the same.
   • It becomes zero.
   • It decreases.
   Check

4. 4. A sealed bottle of air is squeezed so its volume decreases. What happens to the pressure?

   • It stays the same.
   • The air escapes.
   • It decreases.
   • It increases.
   Check

5. 5. A fish is in still, deep water. In which direction is the water pressure largest?

   • from the front only
   • It is equal in all directions.
   • from above only
   • from below only
   Check

6. 6. Water comes out of three holes at different heights in a bottle. Which hole squirts furthest?

   • the lowest hole
   • they are all the same
   • the highest hole
   • the middle hole
   Check

7. 7. What conclusion comes from the three-hole bottle?

   • Pressure in a liquid increases with depth.
   • Water has no pressure.
   • Pressure decreases with depth.
   • Pressure only acts downwards.
   Check

8. 8. A sealed balloon's temperature decreases. What happens to the pressure inside?

   • It decreases.
   • It stays the same.
   • It doubles.
   • It increases.
   Check

9. 9. Very cold liquid is poured over a sealed balloon. Why does it shrink from 20 cm to 5 cm?

   • The particles slow down and exert less pressure, so the balloon gets smaller.
   • Air escapes through the rubber.
   • The balloon melts.
   • The particles get bigger.
   Check

10. 10. As a plane descends from 11 000 m to the ground, what happens to the atmospheric pressure outside?

    • It decreases.
    • It drops to zero.
    • It increases.
    • It stays the same.
    Check

11. 11. Aeroplane tyres warm from −50 °C to 25 °C after landing. What happens to the gas pressure in them?

    • It becomes negative.
    • It stays the same.
    • It decreases.
    • It increases.
    Check

12. 12. What causes gas pressure?

    • gravity only
    • the colour of the gas
    • gas particles hitting the walls of their container
    • gas particles standing still
    Check

13. 13. Why do divers' ears hurt when they go deep?

    • There is less pressure deep down.
    • The water pressure increases with depth.
    • Fish are noisy.
    • The water gets warmer.
    Check

14. 14. Why do dams have thicker walls at the bottom?

    • To save concrete.
    • Water pressure is greatest at the bottom.
    • It looks better.
    • The top has more pressure.
    Check

15. 15. A pressure cooker has a sealed lid. The water inside boils. What happens to the pressure inside?

    • It drops to zero.
    • It increases.
    • It stays the same.
    • It decreases.
    Check

16. 16. All the air is pumped out of a metal can. Why is the can crushed?

    • The air pressure outside is no longer balanced by air inside.
    • The metal melts.
    • The can gets very cold.
    • The vacuum pulls the can inwards.
    Check

17. 17. Marcus's basketball has a higher pressure on a hot day than a cold day. Why?

    • The particles get bigger.
    • The ball gets smaller.
    • The air particles move faster and hit the walls harder.
    • More air gets into the ball.
    Check