Question 1

Two identical magnets were tied to toy cars X and Y as shown below. The S-poles of the two magnets are placed close together. Which of the following shows the direction the toy cars will move?

Accepted Answer

A. Direction toy car X moves: left arrow; Direction toy car Y moves: right arrow. Like poles repel each other. Since the S-poles of the two magnets are placed close together, they will push each other away. Toy car X, on the left, will move to the left. Toy car Y, on the right, will move to the right. This corresponds to option A in the visual provided.

Question 2

Which one of the following can be made into a temporary magnet?

Accepted Answer

A. steel rod. Temporary magnets are typically made from soft magnetic materials like iron or steel, which can be easily magnetized and demagnetized. Glass, plastic, and wood are non-magnetic materials and cannot be made into magnets.

Question 3

The diagram below shows a U-shaped magnet. A, B, C and D are different points on the magnet. Adalyn placed the magnet in a box of steel clips. Which part of the magnet will attract the most number of steel clips?

Accepted Answer

A. A. Magnetic force is strongest at the poles of a magnet. In a U-shaped magnet, the poles are located at the two ends of the 'U'. Point A is positioned at one of these ends, making it a pole where the magnetic force is concentrated, thus attracting the most steel clips.

Question 4

Daniel made an electromagnet as shown below. The batteries were in good working condition and the wires were connected properly. When the electromagnet was brought close to some steel paper clips, none of the paper clips were attracted to it. What could be the reason?

Accepted Answer

D. The rod was made of a non-magnetic material.. For an electromagnet to function, the core material around which the wire is coiled must be a magnetic material (e.g., iron or steel) that can be easily magnetized. The diagram explicitly labels the core as a 'copper rod'. Copper is a non-magnetic material, meaning it cannot be magnetized, and thus an electromagnet cannot be formed regardless of the current or coil turns.

Question 5

Jane used the stroking method to make a magnet. She stroked an iron rod 20 times. The iron rod attracted four paper clips as shown below. What should Jane do if she wants to attract fewer paper clips? She should

Accepted Answer

B. stroke the iron rod fewer times. The strength of a magnet created by the stroking method is generally proportional to the number of strokes applied, up to a certain point. To make a weaker magnet that attracts fewer paper clips, Jane should stroke the iron rod fewer times. Using a plastic rod would prevent it from becoming a magnet at all, not just a weaker one.

Question 6

Three bar magnets PQ, RS and TU can be arranged as shown below. Which one of the following arrangements of the magnets is not possible?

Accepted Answer

C. Magnets stacked vertically: U over S, R over P, Q over T. For magnets to be stably arranged in a stack, attracting poles must be adjacent to each other. Repulsion occurs between like poles and would make the arrangement unstable or impossible to maintain. Let's assume a consistent pole assignment (e.g., P, R, T are North poles and Q, S, U are South poles for magnets PQ, RS, TU respectively). In option C, the arrangement shows U (South pole) directly above S (South pole), and R (North pole) directly above P (North pole). Both pairs involve like poles, which would repel each other, thus making this arrangement not possible.

Question 7

Linda wanted to use a magnet to tell direction. Which of the above set-ups would allow her to do so?

Accepted Answer

C. B and C. To use a magnet to tell direction (like a compass), the magnet must be allowed to rotate freely so it can align itself with the Earth's magnetic field. Set-up B, where the magnet floats on foam in water, allows free rotation. Set-up C, where the magnet is suspended by a thread, also allows free rotation. Set-up D, where the magnet lies on a table, does not allow sufficient free rotation due to friction. Set-up A is functionally identical to Set-up B. Therefore, B and C are valid set-ups.

Question 8

Four magnets were arranged such that they were attracted to one another. A compass was placed near end X and the direction of the compass needle is as shown below. What would be the direction of the needle when the compass was placed at Y?

Accepted Answer

A. Needle points left.. A compass needle's red (North) end points towards the South pole of a magnet. The compass at X shows its North end pointing away from X, indicating that X is a North pole. Since X and Y are the two ends of the same bar magnet (the top magnet), if X is a North pole, then Y must be a South pole. Therefore, when a compass is placed at Y, its North end will be attracted to Y (the South pole), meaning the compass needle will point towards Y, which is to the left.

Question 9

Michael set up an experiment to compare the different strengths of four different magnets, A, B, C and D. The set-ups are as shown below. Which of the following statements is most likely true?

Accepted Answer

D. Magnet C is stronger than magnet A.. The strength of a magnet can be determined by the number of magnetic items (e.g., blocks) it can attract. From the diagrams: Magnet A attracts 2 blocks, Magnet B attracts 3 blocks, Magnet C attracts 4 blocks, and Magnet D attracts 1 block. Comparing these values: C (4 blocks) is the strongest, and D (1 block) is the weakest. Option D states that Magnet C (4 blocks) is stronger than Magnet A (2 blocks), which is true.

P4 Science SA1 2023 — Methodist Girls

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