Question 1

Eric wanted to find out which metal bars, AB, CD and EF, are magnets. He hung each bar from a string and brought them near each other. His results are as shown. Which of the following is correct?

Accepted Answer

A. (1) AB: not a magnet, CD: magnet, EF: magnet. In all four set-ups, bars AB, CD and EF are attracted to a hanging bar (shown shaded/striped above). Attraction alone does not prove that a bar is a magnet because magnetic materials can also be attracted to magnets. The hanging bar acts as the magnet; AB shows attraction in all positions consistently as a magnetic material (not a magnet). CD and EF are shown attracting in orientations that demonstrate repulsion-capable behavior, confirming they are magnets. Only a magnet can both attract and repel — the only consistent conclusion is AB is not a magnet while CD and EF are magnets.

Question 2

Gwen made an electromagnet as shown. She changed the number of batteries in the set-up and counted the number of paper clips attracted by the iron nail. The results are as shown. Based on the results, which statements are correct?
A  The iron nail in set-up H has the strongest magnetism.
B  The strength of the electromagnet depends on the number of batteries.
C  The iron nail in set-up G is a stronger electromagnet than the iron nail in set-up F.
D  The strength of the electromagnet depends on the number of coils around the iron nail.

Accepted Answer

A. (1) A, B and C only. Set-up H with 4 batteries attracted the most paper clips (13), so it has the strongest magnetism (A correct). As the number of batteries increased from 1 to 4, the paper clips attracted increased from 2 to 13, showing the electromagnet's strength depends on the number of batteries (B correct). Set-up G (3 batteries, 10 clips) attracted more clips than F (2 batteries, 5 clips), so G is stronger than F (C correct). The number of coils was not varied in this experiment, so D cannot be concluded.

Question 3

The diagram shows an uprooted tree after a thunderstorm. Why did the uprooted tree die after a month?

Accepted Answer

D. (4) The roots of the tree could not take in water and mineral salts from the soil.. When a tree is uprooted, its roots are no longer in contact with the soil. Roots take in water and mineral salts from the soil, both of which the plant needs to survive and to make food via photosynthesis. Without water and mineral salts, the tree dies.

Question 4

Which part, (1), (2), (3) or (4), supports the plant upright?

Accepted Answer

C. (3) stem. The stem of a plant holds and supports the plant upright, allowing the leaves to be spread out to receive sunlight. Roots anchor the plant and absorb water, the flower is for reproduction, and the leaves make food.

Question 5

The functions of the four body systems, A, B, C and D, are as listed.
System A: supports the body and gives its shape
System B: involves in the exchange of gases between the body and our surroundings
System C: transports digested food, water and oxygen to different parts of the body
System D: breaks down food into simpler substances for the body to absorb
Which of the following correctly represents systems A, B, C and D?

Accepted Answer

B. (2) A: skeletal, B: respiratory, C: circulatory, D: digestive. The skeletal system supports the body and gives it shape (A = skeletal). The respiratory system handles gas exchange between the body and surroundings (B = respiratory). The circulatory system transports digested food, water and oxygen to body parts (C = circulatory). The digestive system breaks down food into simpler substances for absorption (D = digestive).

Question 6

Which of the following is correct?

Accepted Answer

C. (3) Organ involved in digestion of food: small intestine; Organ involved in absorption of food: small intestine. The small intestine is involved in both the digestion of food (digestive juices break down food further) and the absorption of digested food into the bloodstream. The mouth and stomach also digest food, but the large intestine mainly absorbs water, not digested food.

P4 Science CA1 2025 — Catholic High

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