Olympiad Test: Fun with Magnets - Class 6 MCQ

- A magnet can attract materials that are ferromagnetic, such as iron, steel, and nickel.
- Container (i): Contains a copper coin and an iron nail. The iron nail is magnetic and can be separated using a magnet.
- Container (ii): Contains a steel nail and an aluminum earring. The steel nail is magnetic and can be separated using a magnet.
- Container (iii): Contains a marble and a gold coin. Neither is magnetic.
- Container (iv): Contains a nickel coin and a steel nail. Both are magnetic.

Thus, the correct answer is A: Containers (i), (ii) can be separated using a magnet.

P and S are the poles of the magnet and the magnetic force is strongest at these ends. So, they will attract the maximum number of pins.

- The stroking method involves stroking the iron rod with a permanent magnet.
- The end of the iron rod where the stroking begins becomes the opposite pole of the magnet’s starting pole.
- If a magnet's North pole is stroked from end P to end S, P will become the South-seeking pole.
- Thus, the opposite end, S, will become the North-seeking pole.
- Therefore, the correct answer is D: S.

The match box must contain some magnetic material i.e., steel ball bearing.

Since like poles repel each other, magnet P will repel magnet Q.

More is the amount of iron filings stick to a magnet, the more is its strength. Hence, the correct order for the strength of given magnets is X > Y > Z.

The unlike poles were facing each other causing the two magnets to be attracted to each other. As magnet P moved towards magnet Q, the spring coil extended.

Wood placed across the poles will preserve the magnetism for a long time.

Magnetic force is pulling as well as pushing force.

P and S are the poles of the magnet and the magnetic force is strongest at these ends. So, they will attract the maximum number of pins.