PSLE Science Exam Questions With 100% Verified
Questions and Answers (2024-2025)
1. Respiratory System - ANSWER Absorbs oxygen, releases carbon dioxide in blood.
2. Circulatory System - ANSWER Transports oxygen and carbon dioxide in blood.
3. Small Intestine - ANSWER Absorbs sugar into blood for energy.
4. Large Intestine - ANSWER Absorbs water and mineral salts from undigested food.
5. Experimental Reliability - ANSWER Repeat experiments and average results for
accuracy.
6. Temperature Definition - ANSWER Measurement of how hot or cold an object is.
7. Sound Level - ANSWER Not zero due to surrounding sound capture.
8. Volume Measurement - ANSWER Use water displacement to find object's volume.
9. Coin Bank Volume - ANSWER Coins cannot fit due to air spaces.
10. Forces on Rocket - ANSWER Gravitational and frictional forces act during ascent.
11. Bacteria Effectiveness - ANSWER Liquid T less effective than soap in killing bacteria.
12. Water Movement Measurement - ANSWER Time for stain to travel in xylem at
temperatures.
13. Stomata Function - ANSWER Increases size for faster gas exchange in plants.
14. Sound Production - ANSWER Hammer strikes bell due to on/off switch action.
15. Stronger Spring Effect - ANSWER Softer sound due to slower hammer movement.
16. Elastic Potential Energy - ANSWER Converted to other energy forms as toy flies.
17. Air Properties - ANSWER Air occupies space and can be compressed.
18. Jogging Blood Transport - ANSWER Increased blood flow for energy and waste
removal.
19. Digested Food Absorption - ANSWER Less blood to digestive system during jogging.
20. Reliable Results - ANSWER Repeated measurements show smaller differences.
21. Living Things Response - ANSWER Organisms react to environmental changes.
, 22. Propeller Experiment Variation - ANSWER Uncontrolled water changes affect distance
moved.
23. Oil Solidification - ANSWER Pipe temperature lower than oil's freezing point.
24. Short Circuit - ANSWER Extra wires in a circuit cause malfunction.
25. Boiling Definition - ANSWER Liquid to gas change at fixed temperature.
26. Heat Conduction - ANSWER Glass poor conductor; part A heats faster.
27. Glass Cracking - ANSWER Uneven heating causes expansion and cracking.
28. Seed Dispersal - ANSWER Prevents overcrowding and competition with parent plant.
29. Photosynthesis - ANSWER To ensure that plant X completes the process of
photosynthesis.
30. Food formation in plants - ANSWER During photosynthesis, chlorophyll in the leaves
trap sunlight to convert carbon dioxide and water into food and oxygen.
31. Frictional force and rubber strips - ANSWER The rubber strips increase the amount of
frictional force between the claw-like arms and the ball.
32. Heat loss comparison - ANSWER Block B loses heat faster to the cooler water droplets
than to the surrounding air.
33. Spring compression effect - ANSWER The tennis ball will move higher than the
original height. Spring B is compressed more than spring A when the same amount of mass
was placed on them.
34. Bottle sinking reason - ANSWER Air inside the bottle escaped from hole A so water
can enter hole B to occupy the space previously occupied by the escaped air.
35. Temperature difference in metal cans - ANSWER The exposed area of the metal strip
of can B is less than that of metal can A so less heat is lost from the metal strip of can B to the
cooler surroundings.
36. Kinetic energy conversion - ANSWER The kinetic energy of the toy luggage is
converted to heat energy which causes the luggage to slow down and eventually stop moving.
37. Distance travelled by luggage - ANSWER Distance 'd' travelled by the toy luggage will
increase. Less kinetic energy of the toy luggage is converted to less heat energy which causes
the luggage to slow down and eventually stop moving.
Questions and Answers (2024-2025)
1. Respiratory System - ANSWER Absorbs oxygen, releases carbon dioxide in blood.
2. Circulatory System - ANSWER Transports oxygen and carbon dioxide in blood.
3. Small Intestine - ANSWER Absorbs sugar into blood for energy.
4. Large Intestine - ANSWER Absorbs water and mineral salts from undigested food.
5. Experimental Reliability - ANSWER Repeat experiments and average results for
accuracy.
6. Temperature Definition - ANSWER Measurement of how hot or cold an object is.
7. Sound Level - ANSWER Not zero due to surrounding sound capture.
8. Volume Measurement - ANSWER Use water displacement to find object's volume.
9. Coin Bank Volume - ANSWER Coins cannot fit due to air spaces.
10. Forces on Rocket - ANSWER Gravitational and frictional forces act during ascent.
11. Bacteria Effectiveness - ANSWER Liquid T less effective than soap in killing bacteria.
12. Water Movement Measurement - ANSWER Time for stain to travel in xylem at
temperatures.
13. Stomata Function - ANSWER Increases size for faster gas exchange in plants.
14. Sound Production - ANSWER Hammer strikes bell due to on/off switch action.
15. Stronger Spring Effect - ANSWER Softer sound due to slower hammer movement.
16. Elastic Potential Energy - ANSWER Converted to other energy forms as toy flies.
17. Air Properties - ANSWER Air occupies space and can be compressed.
18. Jogging Blood Transport - ANSWER Increased blood flow for energy and waste
removal.
19. Digested Food Absorption - ANSWER Less blood to digestive system during jogging.
20. Reliable Results - ANSWER Repeated measurements show smaller differences.
21. Living Things Response - ANSWER Organisms react to environmental changes.
, 22. Propeller Experiment Variation - ANSWER Uncontrolled water changes affect distance
moved.
23. Oil Solidification - ANSWER Pipe temperature lower than oil's freezing point.
24. Short Circuit - ANSWER Extra wires in a circuit cause malfunction.
25. Boiling Definition - ANSWER Liquid to gas change at fixed temperature.
26. Heat Conduction - ANSWER Glass poor conductor; part A heats faster.
27. Glass Cracking - ANSWER Uneven heating causes expansion and cracking.
28. Seed Dispersal - ANSWER Prevents overcrowding and competition with parent plant.
29. Photosynthesis - ANSWER To ensure that plant X completes the process of
photosynthesis.
30. Food formation in plants - ANSWER During photosynthesis, chlorophyll in the leaves
trap sunlight to convert carbon dioxide and water into food and oxygen.
31. Frictional force and rubber strips - ANSWER The rubber strips increase the amount of
frictional force between the claw-like arms and the ball.
32. Heat loss comparison - ANSWER Block B loses heat faster to the cooler water droplets
than to the surrounding air.
33. Spring compression effect - ANSWER The tennis ball will move higher than the
original height. Spring B is compressed more than spring A when the same amount of mass
was placed on them.
34. Bottle sinking reason - ANSWER Air inside the bottle escaped from hole A so water
can enter hole B to occupy the space previously occupied by the escaped air.
35. Temperature difference in metal cans - ANSWER The exposed area of the metal strip
of can B is less than that of metal can A so less heat is lost from the metal strip of can B to the
cooler surroundings.
36. Kinetic energy conversion - ANSWER The kinetic energy of the toy luggage is
converted to heat energy which causes the luggage to slow down and eventually stop moving.
37. Distance travelled by luggage - ANSWER Distance 'd' travelled by the toy luggage will
increase. Less kinetic energy of the toy luggage is converted to less heat energy which causes
the luggage to slow down and eventually stop moving.
