Home Past papers Science P5 Science SA1 2025 — Nanyang
P5 Science SA1 2025 — Nanyang
P5
Science
2025
SA1
13 questions
8 marks
Source: Nanyang, 2025
This P5 Science SA1 paper from Nanyang (2025) contains 13 questions worth 8 marks. Use it as a study reference for Science topics typically tested at P5 level in Singapore schools.
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q7 Q7 Q8 Q8 Q8 Q8
Q1
MCQ
🖼 Visual
Visual context
A table showing examples of water in different states. The columns are 'Solid', 'Liquid', and 'Gas'. Under 'Solid' are 'snow' and 'ice cubes'. Under 'Liquid' is 'rain'. Under 'Gas' are 'water vapour' and 'steam'.
The diagram below shows some examples of water in different states. Which of the following has been wrongly classified?
(1) rain
(2) snow
(3) steam
(4) water vapour
Explanation
Steam, when observed as visible mist, is actually composed of tiny liquid water droplets suspended in air or water vapour. Therefore, in a strict scientific classification, it is not purely in the gaseous state (unlike invisible water vapour), which makes its classification solely as 'Gas' in the provided table misleading or 'wrong'.
Q2
MCQ
🖼 Visual
Visual context
A table with three rows for processes (A Freezing, B Boiling, C Evaporation) and two columns for heat transfer ('Water lost heat', 'Water gained heat'). All cells in the 'Water lost heat' and 'Water gained heat' columns are blank.
Study the table below. Which process(es) was/were the transfer of heat correctly indicated.
(1) A only
(2) C only
(3) A and B only
(4) B and C only
Explanation
Freezing (Process A) is the change from liquid to solid, which requires water to lose heat. Boiling (Process B) is the change from liquid to gas, which requires water to gain heat. Both of these statements are scientifically correct about the transfer of heat involved in these processes. Evaporation (Process C) also involves water gaining heat, but if only A and B are indicated as correct, it implies a specific context for the 'indication' in the (blank) table.
Q3
MCQ
🖼 Visual
Visual context
A diagram showing an ice cube partially submerged in water, labeled as 'melting ice cube' and 'water'.
The diagram below shows a melting ice cube made of pure water. Which of the following statements is definitely correct?
(1) The temperature of the ice cube is increasing as heat is gained.
(2) The temperature of the ice cube is below 0°C as it is still a solid.
(3) The temperature of the ice cube is above 0°C as some of it has melted.
(4) The temperature of the ice cube remains constant at 0°C as it is melting.
Explanation
During the melting process of a pure substance like ice, the temperature remains constant at its melting point (0°C for water) as long as both the solid (ice) and liquid (water) phases are present. The heat gained is used as latent heat to change the state, not to increase the temperature.
Q4
MCQ
Which of the following statements is true about the water cycle?
(1) The water cycle ensures that there will not be pollution.
(2) Water vapour is formed when condensation takes place.
(3) Evaporation takes place only when the temperature is above 30°C.
(4) Evaporation and condensation ensure a continuous supply of water.
Explanation
The water cycle involves continuous processes of evaporation (liquid to gas) and condensation (gas to liquid), which ensures the natural recycling and continuous availability of water on Earth. Pollution can occur and be transported within the water cycle. Water vapour is formed during evaporation, not condensation. Evaporation occurs at all temperatures above freezing, not only above 30°C.
Q5
MCQ
🖼 Visual
Visual context
A diagram showing a 'water puddle' on a 'road'. Below this is a flow diagram with states 'water vapour', 'water', 'steam', and 'ice'. Arrows represent processes: E (water to water vapour), F (water vapour to water), G (water vapour to steam), H (water to ice), I (ice to water).
A puddle of water was formed on the road as shown below. The arrows, E, F, G, H and I, in the diagram below represent processes. Which of the following best represents the process that the puddle of water is going through?
(1) E
(2) F
(3) G
(4) I
Explanation
Process F represents condensation, which is the change from 'water vapour' to 'water'. If a puddle of water is 'going through' condensation, it means that water vapour from the surrounding air is changing into liquid water and collecting to form or add to the puddle.
Q6
MCQ
🖼 Visual
Visual context
A diagram illustrating the water cycle. 'A' points from the 'sea' upwards to 'water vapour'. 'B' points from 'water vapour' to 'cloud'. 'C' points from 'cloud' downwards to 'rain'. 'D' points from 'rain' towards the 'sea'.
The diagram below represents the water cycle. A, B, C and D represent processes in the water cycle. Which of the following involves a change in the state of water?
(1) A and B
(2) B and C
(3) A, B and C
(4) A, C and D
Explanation
Process A is evaporation (liquid water from the sea turns into gaseous water vapour), which is a change of state. Process B is condensation (gaseous water vapour forms liquid cloud droplets), which is also a change of state. Process C (rain falling from clouds) and D (rain collecting in the sea) are precipitation and collection, respectively, which do not involve a change in the state of water (it remains liquid).
Q7
Structured
1 mark
🖼 Visual
Visual context
Two identical bottles, E and F, with covers. Bottle E shows water droplets on its inner surface. Bottle F shows water droplets on its outer surface.
(ai) Which bottle, E or F, contained water at 95°C?
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Q7
Structured
2 marks
🖼 Visual
Visual context
Two identical bottles, E and F, with covers. Bottle E shows water droplets on its inner surface. Bottle F shows water droplets on its outer surface.
(aii) Explain your answer in (ai).
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Q7
Structured
1 mark
(b) What is the state of matter of the mist?
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Q8
Structured
1 mark
🖼 Visual
Visual context
A distillation setup. Container T, placed on a stand with a flame underneath, contains a liquid from which mist rises. This mist goes up to a metal plate, where water droplets form on the underside. These droplets fall into container U, which also contains a liquid.
(a) Identify the two processes involved in the set-up above.
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Q8
Structured
1 mark
🖼 Visual
Visual context
A distillation setup. Container T, placed on a stand with a flame underneath, contains a liquid from which mist rises. This mist goes up to a metal plate, where water droplets form on the underside. These droplets fall into container U, which also contains a liquid.
(b) In which container, T or U, was the seawater stored in the setup?
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Q8
Structured
1 mark
🖼 Visual
Visual context
A diagram showing two containers, W and V, filled with water. Container W is a wide, shallow bowl labeled '10cm'. Container V is a tall, narrow cylinder labeled '25cm'. A sun icon is drawn above the containers.
(c) Which factor affecting the rate of evaporation was John trying to investigate?
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Q8
Structured
1 mark
🖼 Visual
Visual context
A table showing the amount of water left in Container W and Container V after 11 hours. Container W has 8ml left. Container V has 'K' ml left.
(d) State a value best represented by K.
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