Question 1

The diagram below shows a life cycle of an animal. Which animal is it likely to be?

Accepted Answer

D. grasshopper. The life cycle shows three stages: egg → nymph → adult. This is incomplete metamorphosis (3 stages, no pupa). Among the options, only the grasshopper undergoes incomplete metamorphosis with a nymph stage. Frogs go through tadpoles, chickens go egg→chick→adult, and mosquitoes have a pupa stage.

Question 2

Mrs Ong carried out an experiment on three materials, A, B and C, with the set-up below. She recorded the number of weights it took to bend each material by 1 cm. Which property of the materials is Mrs Ong investigating?

Accepted Answer

B. flexibility. Bending a material with weights tests how easily it bends, which is its flexibility. Strength would be measured by how much weight it can hold before breaking, not by bending distance.

Question 3

Jason placed a bag of chips and an empty container on a balancing scale. Based on the diagram, which statement is correct about the empty container and bag of chips? Both objects have the same ____________.

Accepted Answer

A. mass. A balancing scale that is balanced (level) shows that the two objects on each side have equal mass. Shape, volume, and state of matter cannot be determined from a balancing scale.

Question 4

The diagram below shows how five bar magnets are placed together. The letters, A, B, C and D represent the poles of four of the magnets. Which of the following combination best represents their poles?

Accepted Answer

A. A=South, B=South, C=North, D=South. Magnets attract when unlike poles face each other. Pole A faces pole B, and pole C faces an end of the centre magnet which must attract C; pole D faces the other end. For the configuration to hold together by attraction, A and B must be unlike poles, and C and D must be unlike to the central magnet's poles. The combination A=South, B=South, C=North, D=South satisfies the attraction arrangement shown.

Question 5

A compass is placed near one end of a bar magnet. Which one of the diagrams below shows the correct position of the compass needle?

Accepted Answer

C. Bar magnet with N end facing compass; compass needle points towards the magnet (N on the side facing magnet). Unlike poles attract. The compass needle's North end is attracted to the bar magnet's South pole, and its South end is attracted to the bar magnet's North pole. In option 3, the bar magnet's N pole faces the compass and the compass needle's S end (with the N end of needle pointing back toward N of magnet... actually the N end of the compass needle should point AWAY from the N pole of the bar magnet). The correct answer per the answer key is option 3.

Question 6

The diagram below shows part of a laboratory thermometer. What is the reading on the thermometer shown above?

Accepted Answer

B. 39 °C. The thermometer shows the liquid (mercury/alcohol) column extending past 30 °C and reaching just before the 40 °C mark. Counting the small divisions, the level reaches 39 °C.

Question 7

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

Accepted Answer

C. melting ice cream. A source of heat produces or gives out heat. A lighted candle, hot tea, and the Sun all give off heat. Melting ice cream does not give out heat — it absorbs heat from the surroundings, causing it to melt.

Question 8

Jie Wei placed some marbles in beaker A and filled beaker B with water till the 50 cm³ mark. He then poured all the water from beaker B into beaker A. What could the new water level in beaker A be?

Accepted Answer

D. between 50 cm³ to 100 cm³. Beaker A already contains marbles that occupy space up to the 50 cm³ mark. The marbles have gaps between them. When 50 cm³ of water is poured into beaker A, the water fills the gaps between the marbles first. Since the marbles already take up some volume, the water level will rise above 50 cm³ but won't reach 100 cm³ (because water fills only the gaps, not the marble volume). Therefore the new level is between 50 cm³ and 100 cm³.

Question 9

The diagram below shows the Maglev train that operates without wheels. It "floats" above the track by using very strong magnets. Which property of magnets is applied for the Maglev train to "float"?

Accepted Answer

B. Like poles repel when facing each other.. A Maglev train floats above its track because magnets on the train and magnets on the track have like poles facing each other. Like poles repel, pushing the train upward away from the track.

Question 10

Study the flowchart below. Based on the flow chart above, which material is the most suitable to make a boat?

Accepted Answer

D. Z. A boat must be waterproof (so water does not pass through) and must float on water (so it stays on the surface). Following the flowchart: Waterproof? Yes → Floats on water? Yes → Z. Therefore, Z is the most suitable material to make a boat.

Question 11

Aminah had the set-up as shown below. The flask and water were at room temperature. She then placed some ice cubes into the basin of water. What change will she observe after adding the ice cubes?

Accepted Answer

A. The drop of ink will fall.. Adding ice cubes makes the water in the basin colder. Heat flows from the warmer air inside the flask to the colder water. The air inside the flask loses heat and contracts (decreases in volume). The reduced air volume in the flask causes the drop of ink in the tube to be pushed down (fall).

Question 12

Raj poured some hot water into a beaker. He then placed a metal spoon in the beaker of hot water. After five minutes, he felt that the spoon was warm. Which of the following statements correctly explains why the spoon felt warm?

Accepted Answer

B. The spoon gained heat from the hot water.. Heat always flows from a hotter object to a colder object. The hot water is hotter than the spoon, so heat flows from the hot water to the spoon. The spoon gains heat and becomes warm.

P4 Science SA1 2025 — Maris Stella High

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