P4 Science CA2 2023 — Nan Hua

Q: Study the diagram of a measuring cylinder below. What is the volume of liquid Q?

C. 43 ml. The close-up view shows that the liquid level is between 40 ml and 50 ml, sitting at the 3rd small marking above 40. Each small marking represents 1 ml (10 divisions between 40 and 50). Reading the meniscus at the bottom gives 43 ml.

Q: The diagram below shows an air-tight container with a capacity of 500 cm³. 200 cm³ of water had been poured into the container. An additional 50 cm³ of air was later pumped into the container using an air pump. Which of the following shows the final volume of air in the air-tight container and the change to the total mass of the air-tight container?

A. Final volume of air: 300 cm³; Total mass: increases. Air is compressible, so any volume of air pumped in still occupies only the space not taken up by water, which is 500 − 200 = 300 cm³. The added air has mass, so the total mass of the container increases.

Q: Which of the following is not a source of heat energy?

D. a towel. A switched-on iron, a switched-on computer and a campfire all give out heat, so they are sources of heat. A towel does not produce heat on its own; it only traps body heat. Therefore the towel is not a source of heat energy.

Q: Alex's fingers feel cold when he touches the spoon placed in a cup of ice water. Which of the following statements is correct?

D. Heat travels from his fingers to the water through the spoon.. Heat (not 'coldness') always flows from a hotter object to a colder one. Alex's fingers are warmer than the ice water, so heat flows from his fingers through the spoon to the cold water, which is why his fingers feel cold.

Q: In the set-up below, a drop of red ink is placed in the middle of the glass tube connecting the two identical flasks, X and Y. Each flask is then placed in a basin of water. Which arrangement will make the drop of red ink move the closest to flask X?

D. Place flask X in a basin of ice water; place flask Y in a basin of water at 95 °C. Air in flask Y heated to 95 °C expands strongly, while air in flask X placed in ice water contracts. The red ink drop is pushed from the higher-pressure (expanding) Y side towards the lower-pressure (contracting) X side, so it moves closest to flask X.

P4 Science 2023 CA2 8 questions 20 marks

Source: Nan Hua, 2023

This P4 Science CA2 paper from Nan Hua (2023) contains 8 questions worth 20 marks. Use it as a study reference for Science topics typically tested at P4 level in Singapore schools.

Q1 MCQ 2 marks 🖼 Visual

Study the diagram of a measuring cylinder below. What is the volume of liquid Q?

Q2 MCQ 2 marks 🖼 Visual

The diagram below shows an air-tight container with a capacity of 500 cm³. 200 cm³ of water had been poured into the container. An additional 50 cm³ of air was later pumped into the container using an air pump. Which of the following shows the final volume of air in the air-tight container and the change to the total mass of the air-tight container?

Q3 MCQ 2 marks 🖼 Visual

Which of the following is not a source of heat energy?

Q4 MCQ 2 marks 🖼 Visual

Alex's fingers feel cold when he touches the spoon placed in a cup of ice water. Which of the following statements is correct?

Q5 MCQ 2 marks 🖼 Visual

In the set-up below, a drop of red ink is placed in the middle of the glass tube connecting the two identical flasks, X and Y. Each flask is then placed in a basin of water. Which arrangement will make the drop of red ink move the closest to flask X?

Q6 Structured 4 marks 🖼 Visual

David carried out the following experiment in the kitchen which had a room temperature of 30 °C. He filled containers P and Q with different amounts of water at 80 °C. He wanted to find out in which container, P or Q, would an egg be cooked more quickly. (a) What is the changed (independent) variable in this experiment? [1] (b) If both eggs were left in the containers for 10 minutes, in which container, P or Q, would the egg be cooked more quickly? Explain your answer. [2] (c) The above set-up was left untouched in the kitchen. What would happen to the temperature of the water in containers P and Q after one day? [1]

Q7 Structured 3 marks 🖼 Visual

Two cups were found stuck to each other in Mrs Raju's cupboard. She added some ice cubes to cup B as shown in the diagram below. (a) Fill in the blanks with the correct words. After a while, Mrs Raju found it easier to remove the two cups from each other. Cup B ____ heat to the ice cubes and ____, making it easier for her to remove the two cups from each other. [1] (b) A metal bridge has gaps at its ends as shown below. Explain how the gaps help to prevent the bridge from bending on a very hot day. [2]

Q8 Structured 3 marks 🖼 Visual

Ali poured sand into a toy submarine and dropped it into a container of water as shown in the diagram below. He measured the distance, d, from the bottom of the container to the base of the toy submarine. Ali repeated the experiment by pouring different amounts of sand into the toy submarine. He recorded the results of his experiment as shown in the table below: Mass of sand in the toy submarine (g) | Distance d (cm) 10 | 25 20 | 20 30 | 15 40 | 10 (a) What is the relationship between the mass of the sand and distance d? [1] (b) Ali dropped the toy submarine on the floor and it cracked. When he placed the toy submarine back into the water, he observed bubbles coming out from the crack. After some time, the toy submarine sank deeper. Explain why. [2]

P4 Science CA2 2023 — Nan Hua

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