P6 Science CA1 2025 — Henry Park

Four students were asked to draw a circuit showing three bulbs in parallel, a battery, and a switch that controls all three bulbs. Which student is correct?

Ram sets up a circuit containing two batteries and three lamps as shown. Which of the following is the correct circuit diagram for this arrangement?

Jenny arranged three similar iron bars on a wooden table as shown below. End F of iron bar R was brought close to each end of the other two iron bars. Based on the information given, which of the following is likely to be correct?

Jamie prepared a set-up as shown in the diagram below. She then placed 50 cm³ of marbles, pumped in 100 cm³ of air into the container and sealed it. Which of the following statement(s) is / are possible observations made by her? A. The mass of the set-up will not change. B. The total volume of air in the set-up will increase. C. The total volume of water in the set-up will increase. D. The marbles will take up 50 cm³ of space in the set-up.

Huimin set up the following electrical circuits to find out if materials W, X, Y and Z were electrical conductors. She recorded her observations: Bulb A — No, Bulb B — Yes, Bulb C — Yes, Bulb D — Yes, Bulb E — Yes. Based on the observations above, which materials are electrical conductors or electrical insulators?

Rani prepared four containers of water labelled W, X, Y and Z. She added substance H to W and then placed W and X in the freezer for an hour. She then added substance H to Y and then heated Y and Z for twenty minutes. The diagrams below show what she observed. Based on the above experiment, which of the following statements are correct about the freezing point and boiling point of water when substance H is added? A. The boiling point of water increases. B. The boiling point of water decreases. C. The freezing point of water increases. D. The freezing point of water decreases.

Lisa wanted to find out if a metal bar is a magnet. She drew four diagrams A, B, C and D as shown below. [Diagram A: end W of metal bar is attracted to end Y of a magnet (poles Y on the left, Z on the right). Diagram B: end W of metal bar is attracted to end Z of a magnet (poles Z on the left, Y on the right). Diagram C: end W of metal bar is repelled by end Z of a magnet (poles Z on the left, Y on the right). Diagram D: end W of metal bar is attracted to end Y of a magnet (poles Y on the left, Z on the right).] Which pair of diagrams allows her to confirm that the metal bar is a magnet?

The table below shows the properties of a substance at different temperatures. Which of the following statements about the substance is / are definitely correct? A. It is water. B. It melts at 150°C. C. It is a gas at 250°C. D. Its freezing point is lower than 150°C.

The set-up below uses a light sensor to count the number of objects on a moving belt. The objects are of the same size. The graph below shows the data recorded when the objects passed the light sensor within a period of 20 seconds. [Graph: Amount of light vs time (s). Light level drops to lower values between roughly 2–4 s, 6–8 s, 10–12 s, 16–18 s with one shallower dip indicating an object further away or smaller gap.] Based on the graph above, which of the following statement(s) is/are correct? A. Five objects moved past the light sensor. B. The belt did not move at a same speed. C. Two of the objects were placed further apart. D. All the objects allowed same amount of light to reach the sensor.

Christine conducted an experiment to compare how well different types of materials absorb water. She placed 4 strips of materials, W, X, Y and Z, of identical size, into a basin of blue-coloured water for 10 minutes. Christine recorded her observations as shown in the diagram below. Based on the information above, which of the following shows the most suitable material to make a raincoat, a towel and a cup?

Wenhao went for a run at the track. After the run, he perspired and felt even colder when it became windy. Which of the following best explains why he felt colder when it became windy?

The diagrams below show Devi blowing air into a float and then sitting on it in water. Based on what Devi has done, which of the following shows correctly the properties of the material used to make the float?

Four metal pins A, B, C and D were fixed onto a wooden board as shown in Figure 1. Figure 2 shows two batteries and a bulb connected to two wires X and Y. [Figure 1: Pins arranged as A (top-left), B (top-right), D (bottom-left), C (bottom-right). Figure 2: Two batteries in series connected to a bulb with two free leads X and Y.] Ravi connected some but not all the pins with wires. He then connected X and Y across different pairs of pins. He recorded his results in the table below. Which one of the following correctly shows the connections tested by Ravi?

Anna made a toy. First, she cut out a square of dimension 1 cm by 1 cm from a piece of cardboard and taped the piece to one end of a paper tube. Next, she fixed a torch onto the other end of the paper tube. She then moved the toy to different distances, in front of a wall in a completely dark room and switched the torch on as shown in the diagram below. [Figure: Toy held at 30 cm, 60 cm, and 100 cm from the screen.] A shadow was cast on a screen and Anna made the following statements. A. The shadow formed on the wall was bigger when the toy was nearer to the screen. B. The size of the shape formed on the screen was the same at 30 cm and 60 cm. C. At a distance of 60 cm, the shape formed on the screen was smaller than at a distance of 100 cm. Which of the statement(s) about the shadow formed on the wall is / are correct?

Andy wants to buy an umbrella to use on rainy days. The diagram shows part Q of the umbrella. Andy has material S shown in the diagram below. [Figure: A roll of flexible sheet material labelled Material S.] He wants to know if material S is suitable to make part Q of an umbrella. (a) Besides flexibility, name two other properties that Andy needs to test to confirm if material S is suitable to make part Q. [2] (b) Explain your answer in (a)(i). [1] (c) Choose the property you have mentioned in (a)(ii). Describe how Andy could test material S for the property. Or you may draw how the set-up looks like for testing the material. [2]

Dani conducted an experiment to study how the arrangements of bulbs in a circuit affected their brightness. He used all of the apparatus for his experiment: six identical bulbs, four identical batteries, wires. After setting up his experiment, he discovered that when one bulb fused, the remaining bulbs in set-up A did not light up, while the remaining bulbs in set-up B still remain lit. (a) In the space provided below, draw a diagram (using circuit symbols) for each of the set-ups that he constructed to conduct his experiment. He conducted both experiments at the same time. [2] (b) Using the circuit diagram (of the hairdryer with switch 1, switch 2, motor M and heater), describe how Dani uses switches 1 and 2 to get hot and cold air from the hairdryer. [2]

Organism W lives in the desert. The temperature in the desert can range from as low as 10°C at night to as high as 45°C in the day. (a) In the morning, water droplets are found on the back of organism W. How are the water droplets formed? [2] The diagram shows a bottle which is designed to obtain water from the surrounding air. The dome-shaped design resembles the body of organism W. [Figure: A dome-shaped metal bottle with an uneven (ridged) surface and an opening for drinking water.] The bottle is placed outside in the evening, allowing the steel body to cool. In the morning, when the surrounding air is warmer, the dew drops are formed and collected in the bottle. (b) How does the uneven surface of the bottle help to collect more water? [1]

Jack and Jill were standing outdoors on either side of a wall during the day. From where he was standing, Jack was not able to see Jill. Explain why.

Swee Heng and Rahimah wanted to find out how the type of material affects the rate of heat transfer. Their experimental set-up: two identical cups of hot water at 98°C, each with a spoon — one made of material X, the other of material Y. Swee Heng's results: after 3 minutes — X cup 89°C, Y cup 94°C. Rahimah's results: after 3 minutes — X cup 89°C, Y cup 94°C; after 6 minutes — X cup 82°C, Y cup 91°C; after 9 minutes — X cup 75°C, Y cup 86°C. (a) Explain how Rahimah's results give a better comparison of how quickly heat passes through the materials X and Y. [1] (b) Based on the results of Rahimah's and Swee Heng's experiments, state which material, X or Y, is more suitable to make the warming tray. Explain your answer. [2] (c) Based on the results from Rahimah's and Swee Heng's experiments, explain why material X is not suitable to make the container. [2]

David inserted a rod of material W and a thermometer into a styrofoam box as shown. He poured water at 98°C into the styrofoam box and covered the box with a lid. After 10 minutes, the temperature of the water was recorded. David repeated the experiment with similar sized rods of different materials, X, Y and Z. He recorded his results: Material W — 98°C → 66°C; X — 98°C → 90°C; Y — 98°C → 74°C; Z — 98°C → 85°C. (a) State the aim of the experiment. [1] (b) Why did the temperature of water decrease after each rod was inserted? [1] (c) Explain why the temperature of water at the start of the experiment has to be the same when different rods were used. [1]