P6 Science SA1 2025 — Catholic High

The diagram represents the water cycle. What of the following is correct? [Table with two columns 'Condensation occurred at' and 'Evaporation occurred at'.]

Set-ups J and K were placed on a table. They contained equal amounts of water at 70 °C and equal number of ice cubes as shown. The beaker in set-up K was narrower. After a while, more water droplets formed in set-up J. Which statement explains this observation?

Rashida conducted an experiment using four set-ups with beakers each containing an equal volume of water at the start of the experiment. At the end of the experiment, she recorded her results as shown. [Table — Set-up | Exposed surface area of beaker (cm²) | Windy | Location | Volume of water left in beaker (ml). W: 70, yes, open field, 160. X: 100, yes, under a tree, 165. Y: 70, no, under a tree, 170. Z: 100, yes, open field, 150.] Which two set-ups support the hypothesis, 'the greater the exposed surface area of the water, the lesser the volume of water left in the beaker'?

Which of the following is not an effect of a force?

In the set-up, a compressed spring was used to push a block. The block would then slide along the tabletop before stopping. Which force(s) acted on the sliding block? [Table with columns: Elastic spring force | Gravitational force | Frictional force.]

In the set-up, the bulb will light up if the load has a mass of 15 kg or more. How can the set-up be changed so that the bulb will light up if the load has a mass of 12 kg?

Melling set up an experiment as shown. When she pushed the car from X, it moved down the ramp and stopped at point Y. [Diagram 1: a car with a magnet attached is pushed from X down a ramp and stops at Y on the flat surface.] She repeated the experiment with object G placed near Y. She pushed the car from X with the same force and it moved down the ramp, and then rolled backwards before stopping at Z. The car did not touch object G. [Diagram 2: the car stops at Z, which is before Y, with G located near Y.] She replaced object G with object H and pushed the car from X with the same force. The car moved towards object H at a faster speed, made contact with it and stopped. [Diagram 3: the car reaches H, which sits near Y.] What could objects G and H possibly be? [Table with columns G | H.]

Hock Siang placed a ping pong ball on a mouthpiece as shown. He then blew into the mouthpiece and observed the ball hovering in mid-air for a short period of time. Which statement(s) explained why the ball was able to hover in mid-air? A. The force exerted by the moving air was greater than the weight of the ball. B. The warm air exhaled from the mouth heated the air up and cause the ball to rise. C. The gravitational force acting on the ball was greater than the force exerted by the moving air.

A scientist conducted a study and observed that organism L prefers a dark and moist environment. The table shows two physical characteristics, X and Y, and the habitats that organisms live in. [Table — Habitat | Characteristic X | Characteristic Y. field: high, high. desert: low, high. M: low, low. N: high, low.] What habitat does organism L live in and what are the characteristics of X and Y? [Table with columns Habitat of L | Characteristic X | Characteristic Y.]

A tree supports only the organisms shown. Which of the following is correct?

(a) State what boiling means. [1] (b) Melvin wanted to cook some eggs at 80 °C. When the water boiled, he removed the pot from the stove and placed it on a metal tabletop. He added some cold water before putting in some eggs. He covered the pot for 12 minutes. Without reheating the pot, suggest two ways that Melvin can do to ensure that the water was kept at about 80 °C in the same pot. [2] (i) To reduce heat loss from the water: ____ (ii) To supply heat to the water: ____

Keith placed a wooden block on a ramp as shown. When angle X was 5°, the block did not slide down the ramp. He gradually increased angle X by making the ramp steeper until the block first began to slide. He recorded angle X when this happened. He conducted the experiment using ramps made of two other different surfaces. The results of the experiment are as shown. [Table — Type of surface | Angle X (°). rubber: 45. wood: 30. plastic: 20.] (a) When angle X was 5°, the block did not slide down the ramp. Explain why. [1] (b) Explain why angle X was smaller for the plastic surface as compared to the wooden surface. [1] (c) The picture shows a staircase with anti-slip tapes pasted to the steps to help prevent slipping while walking down. [Picture: a flight of stairs with dark anti-slip tape strips fixed across the front of each step.] Based on the results, which material is most suitable for making the anti-slip tape? Explain why. [2]

Aloysius conducted an experiment using the set-ups as shown. He added the same amount of water onto four similar cloths, W, X, Y and Z. The graph shows the mass of each cloth over a period of time. [Graph: mass of cloth (g) on the y-axis versus time (min) on the x-axis; four lines starting from the same mass and decreasing — Z decreases the least, then Y, then X, then W decreases the most.] (a) Based on the graph, explain how the different distances of the lamp from the cloth affect the mass of the cloth. [2] (b) Based on the graph, which variable, light or wind, has a smaller effect on the mass of the cloth? Give a reason. [1]