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Primary 4 Science Materials Quiz
Free P4 Science Materials quiz, Qwen3.7 AI version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Primary 4 Science Quiz - Materials (Answer Key)
Section A: Multiple-Choice Questions
1. (3)
- Reasoning: Solids have a definite shape and a definite volume. They do not change shape to fit their container.
2. (3)
- Reasoning: The water changes its shape to fit the cylinder, bowl, and box. This shows that liquids have no definite shape but take the shape of their container.
3. (2)
- Reasoning: A raincoat must be waterproof to keep the wearer dry. Plastic is waterproof, whereas cotton, paper, and wood absorb water or get damaged by it.
4. (2)
- Reasoning: Bridges need to support heavy loads (cars, trains). Steel is chosen because it is very strong and hard.
5. (2)
- Reasoning: Windows need to let light in so we can see outside. Glass is transparent, allowing light to pass through clearly.
6. (4)
- Reasoning: Gases have no definite shape or volume. The particles move freely and spread out to fill the entire container they are in.
7. (3)
- Reasoning: A pot handle gets hot when cooking. Plastic is a poor conductor of heat (insulator), so it stays cool enough to touch. Metals like aluminum, copper, and iron are good conductors and would burn your hand.
8. (3)
- Reasoning: Scissors are made of metal (for the blades) and plastic or rubber (for the handles). A marble, ruler, and ring are typically made of a single material.
9. (2)
- Reasoning: Rubber bands need to stretch to go around the newspapers and then return to their original shape to hold them tight. This property is flexibility/elasticity.
10. (4)
- Reasoning: The three states of matter are Solid, Liquid, and Gas. Energy is not a state of matter; it is the ability to do work or cause change.
Section B: Structured Questions
11. (a) Material: P [1] Reason: It is transparent, allowing light to pass through so we can see outside. [1]
(b) Material: Q [1] Reason: It is absorbent (not waterproof) and soft, which allows it to soak up water from the body. [1] (Note: While the table says "Waterproof: No" for Q, in the context of a towel, "not waterproof" implies it absorbs water. Students should link "No" to absorption capability for a towel.)
(c) It is hard / It is a good conductor of heat. [1] (Note: Either is acceptable. Hardness ensures durability; conductivity ensures food cooks evenly.)
12. (a) The stone. [1] (Reasoning: Objects denser than water sink.)
(b) The stone is denser than oil. [1]
(c) Observation: The plastic duck will float back to the surface. [1] Explanation: The plastic duck is less dense than water (or lighter than the water it displaces), so the water pushes it up. [1]
13. (a) The size of the bag / The type of weights used / How the weights are added. [1] (Any one controlled variable is accepted.)
(b) Add weights to each bag one by one until the bag breaks or tears. The bag that holds the most weight before breaking is the strongest. [2] (1 mark for method of adding weights, 1 mark for criterion of "most weight before breaking".)
(c) To ensure the tear is caused by the weight limit and not by sudden jerking or uneven force. [1]
14. (a) [3]
- Transparent: Object B
- Translucent: (None)
- Opaque: Object A, Object C (Note: Mirrors are opaque because you cannot see through them to the other side.)
(b) It is opaque, which provides privacy and security. [1]
15. Air has mass and takes up space. [2] (1 mark for "has mass", 1 mark for "takes up space". Both are required to define matter.)
Section C: Open-Ended Questions
16. (a) Strength / Durability / Flexibility. [1]
(b) Nylon is stronger and more durable than thin plastic. It is also flexible, so it can bend in the wind without breaking easily, whereas thin plastic might tear or crack. [2] (1 mark for strength/durability comparison, 1 mark for flexibility/wind resistance.)
(c) Strength (or Durability). [1]
17. No, the statement is incorrect. [1] Explanation: Not all solids are hard. For example, a sponge or cotton wool is a solid, but it is soft and can be compressed. [1] (1 mark for correct judgment, 1 mark for valid counter-example.)
18. (a) Plastic / Tape / Wax. [1] (Any waterproof material is accepted.)
(b) It is waterproof / It does not allow water to pass through. [1]
19. (a) Gas [1] (b) Solid [1]
20. Metal is a good conductor of heat, allowing the food to cook quickly. [1] Plastic/Wood is a poor conductor of heat (insulator), keeping the handle cool so it can be held safely. [1]