This P5 Science CA2 paper from Anglo Chinese (2025) contains 10 questions worth 25 marks. Use it as a study reference for Science topics typically tested at P5 level in Singapore schools.
Q1Structured2 marks🖼 Visual
The diagrams show the various stages of the water cycle.
(a) Arrange the stages in the correct order by filling in the boxes with the letters W, X, Y and Z.
(b) Name the two processes that take place in the water cycle.
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The diagram shows Mr Daniel drinking a cup of hot coffee. His spectacles became misty as he drank his hot coffee as shown.
(a) What were the changes of state of water for the above observation?
(b) His spectacles became clear again after a while. Explain why.
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The diagram shows Andy hanging his wet clothes on the clothesline in the morning. He did not finish hanging all the clothes and left some in the basket.
(a) He came back in the evening and realised that the clothes in the basket were still wet. Explain why.
(b) Name two other factors which affects the rate of evaporation.
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Shamir placed a glass of cold water and ice cubes in a sealed transparent box as shown in the diagram. He then waited for 10 minutes.
(a) The amount of water vapour in the air decreased in the box after 10 minutes. Explain why.
Shamir then placed a hot glass of water in another similar box.
(b) What would happen to the amount of water vapour in the air in the box after 10 minutes?
(c) In diagram 2, draw where water droplets will be formed.
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Danny wanted to find out which type of liquid, A, B or C, evaporated the fastest. He prepared three beakers each with 500 ml with each type of liquid and left them on a table in the science lab. At the end of three hours, the volume of each liquid left was as shown.
(a) Based on Danny's observations, what can he conclude about liquid B?
(b) Name two other variables Danny should keep constant in his experiment for a fair test.
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Daniel used a handheld mist fan to cool himself down on a hot day. He usually turns on the fan which cools him down. However, on some days, he also turns on the mist, causing water to be sprayed on him, which helps him cool him down further.
(a) Explain why he cools himself down further when he turns on the mist in the fan.
(b) Suggest one change Daniel can make to the water so that it can help to cool him down faster.
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The melting points and boiling points of three substances, P, Q, and R are shown in the table.
Substance | Melting Point (°C) | Boiling Point (°C)
P | Below 0 | 10
Q | 4 | 70
R | 40 | 200
Chris has a closed container of volume 200 cm³. He stored 250 cm³ of a substance in the container at 30°C.
(a) State which substance, P, Q or R did he store in the container. Explain your answer.
Chris has a plastic tray as shown.
(b) State if he can store substance Q in the tray at 30°C. Explain your answer.
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List the procedure to carry out an investigation using only the following materials to find out how the presence of wind affects the rate of evaporation of water. The final step has been done for you.
Materials: 2 similar paper towels, Syringe, Beaker with 10ml of water, Electronic balance, Hair dryer
1. ____
2. ____
3. ____
4. ____
5. Compare the results.
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Tim set up the experiment with two identical trays, X and Y, as shown. Tray X was at 60°C and tray Y was at room temperature. Water droplets formed on each tray and were collected in beakers A and B. He then measured the amount of water collected in each beaker at the end of 10 minutes and plotted graph as shown.
(a) State the aim of Tim's experiment.
(b) Explain why more water was collected in beaker B than beaker A.
(c) Suggest one change Tim can make to Tray Y to collect water faster with beaker B.
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