Question 1

1. A padlock is made of metal because metal is

Accepted Answer

(1) strong. Metal is primarily chosen for padlocks because of its strength, which allows the padlock to resist force and tampering. While metal can be heavy and waterproof, and some metals are flexible, strength is the most critical property for a padlock's security function.

Question 2

2. Which of the following objects are made from plants?

Accepted Answer

(1) A and B only. Object A (Eraser) can be made from rubber, which is derived from rubber trees (plants). Object B (Toilet Paper) is made from wood pulp, which comes from trees (plants). Object C (Plastic cup) is made from plastic, a petroleum product. Object D (Wool sweater) is made from wool, an animal product. Therefore, only A and B are made from plants.

Question 3

3. Mr Tan is looking for materials to make a mop as shown below. He needs two types of materials to make parts X and Y.
Look at the table of some of the materials and their properties.
Which material above is most suitable to be used for part X and Y ?

Accepted Answer

(3) G, E. Part X is the mop handle, which needs to be rigid (not flexible) and durable (does not break easily). Material G fits these criteria: it is not flexible and does not break easily. Part Y is the mop head, which needs to be flexible and able to absorb water. Material E fits these criteria: it is flexible, absorbs water, and does not break easily. Thus, G for Part X and E for Part Y is the most suitable combination.

Question 4

4. Siti conducted an experiment to test the flexibility of four different materials, P, Q, R and S. The strips are of the same thickness and length.
The results are shown below.
Arrange the materials from the most flexible to the least flexible.

Accepted Answer

(3) R, Q, S, P. Flexibility is indicated by how much the material bends; a greater distance bent means greater flexibility. From the table:
- R bent 7 cm (most flexible)
- Q bent 5 cm
- S bent 4 cm
- P bent 2 cm (least flexible)
Arranging from most to least flexible gives R, Q, S, P.

Question 5

5. Three organisms, W, X and Y have characteristics as shown in the table below.
Abby, Bala and Charles made the following statements.
Who is/are correct?

Accepted Answer

(3) Abby and Charles only. Organism W has flowers, which is a characteristic of flowering plants. So, Abby's statement 'W is a flowering plant' is correct. Organism X reproduces by spores. This includes fungi (like mushrooms) and non-flowering plants (like ferns), so Bala's statement 'X can only be a fungi' is incorrect. Organism Y can only be seen using a microscope, indicating it is microscopic. Bacteria are microscopic organisms, so Charles's statement 'Y is likely a bacteria' is correct. Therefore, Abby and Charles are correct.

P3 Science SA1 2025 — Ai Tong

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