P4 Science CA2 2025 — Rosyth | Singapore Past Year Paper

Q: Which of the following is most suitable to measure 5 ml of water accurately?

4. A syringe. A syringe is specifically designed for precise measurement and dispensing of small liquid volumes, making it the most accurate tool among the given options for measuring 5 ml of water. Pan balances and electronic weighing scales measure mass, while a measuring beaker is generally less precise for very small volumes.

Q: Andy placed metal objects of different sizes into each of the beakers, P, Q, R and S. He then added water into the beakers until the water levels are the same. Which beaker contained the greatest volume of water?

1. P. Since the final water levels in all beakers are the same, the total volume (volume of water + volume of submerged object) is constant for all beakers. To have the greatest volume of water, the beaker must contain the smallest object, as it displaces the least amount of water. Beaker P has the smallest metal object.

Q: Lee Lin wanted to find out the volume of an irregular object X. She was given the following apparatus to carry out her experiment. She came up with the following steps to carry out her experiment A. Calculate the increase in volume B. Record the total volume of water and object X C. Pour 50 ml of water into the measuring cylinder D. Tie a string around object X and lower it into the water in the measuring cylinder Which of the following shows the correct order of steps Lee Lin should take?

2. C, D, B, A. To find the volume of an irregular object using water displacement: 1. Start by pouring a known volume of water into the measuring cylinder (C). 2. Gently lower the object into the water (D). 3. Record the new total volume of water and the object (B). 4. Calculate the volume of the object by subtracting the initial water volume from the final volume (A). Therefore, the correct order is C, D, B, A.

Q1 Structured 1 mark 🖼 Visual

(e) Complete the table below with "changed", "measured" or "kept the same" to identify the type of variables in the experiments conducted. Variables Size of the balls Final volume of water Number of each type of balls

Q1 Structured 1 mark 🖼 Visual

(a) Draw the observed position of the balls from bag A when added to the measuring cylinder.

Q1 MCQ 2 marks 🖼 Visual

Which of the following is most suitable to measure 5 ml of water accurately?

Q1 Structured 1 mark 🖼 Visual

(b) Record the volume of the water when the balls from bag A are added. Volume: ____ ml

Q1 Structured 1 mark 🖼 Visual

(c) Draw the observed position of the balls from bag B when added to the measuring cylinder.

Q1 Structured 1 mark 🖼 Visual

(d) Record the volume of the water when the balls from bag B are added. Volume: ____ ml

Q1 Structured 1 mark

(f) Based on your observations, what can be concluded about the materials of the balls and their ability to float or sink in water?

Q2 Structured 1 mark

(h) Lowering the balls gently into the measuring cylinder allows the volume of the balls from bag A to be more accurately measured. Give a reason.

Q2 Structured 2 marks 🖼 Visual

(g) Using your results recorded in Task 1, calculate the volume of the 2 balls from bags A and B. Starting volume of water (cm³) : 70 Volume of the 2 balls from bag A (cm³) : ____ Volume of the 2 balls from bag B (cm³) : ____

Q2 Structured 1 mark

(i) The volume of the balls from bag B cannot be accurately found in this experiment. Explain why,

Q2 MCQ 2 marks 🖼 Visual

Andy placed metal objects of different sizes into each of the beakers, P, Q, R and S. He then added water into the beakers until the water levels are the same. Which beaker contained the greatest volume of water?

Q3 MCQ 2 marks 🖼 Visual

Lee Lin wanted to find out the volume of an irregular object X. She was given the following apparatus to carry out her experiment. She came up with the following steps to carry out her experiment A. Calculate the increase in volume B. Record the total volume of water and object X C. Pour 50 ml of water into the measuring cylinder D. Tie a string around object X and lower it into the water in the measuring cylinder Which of the following shows the correct order of steps Lee Lin should take?

Q4 Structured 1 mark 🖼 Visual

Siti filled a container completely with 100 cm³ of stones as shown below. (a) Put a tick (✔) in the box that shows the correct volume of the container. Volume of container Less than 100 cm³ 100 cm³ More than 100 cm³ (b) Explain your answer in (a).

Q5 Structured 1 mark 🖼 Visual

Sam filled a syringe with equal volume of substances A and B. He sealed the opening after that, as shown below. He pushed the plunger in and recorded his observation as shown in the diagram below. (a) Identify the state of matter of B. (b) Based on Sam's observation, state a difference between the property of A and B.

P4 Science CA2 2025 — Rosyth

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