Exploring Magnets — Practice

Q1. Which of the following best describes a magnet?

• A. An object that glows when rubbed.
• B. An object that attracts certain materials like iron.
• C. An object that conducts electricity through any metal.
• D. An object that floats on the surface of water.

Q2. The naturally occurring magnets discovered in ancient times are known as

• A. Bar magnets
• B. Electromagnets
• C. Lodestones
• D. Solenoids

Q3. A magnet that is rectangular like a small stick is called a

• A. Ring magnet
• B. Bar magnet
• C. U-shaped magnet
• D. Disc magnet

Q4. Which shape of magnet is bent so that its two poles end up close to each other?

• A. Bar magnet
• B. U-shaped magnet
• C. Ring magnet
• D. Spherical magnet

Q5. A ring magnet is shaped like

• A. A flat ring with a hole in the middle
• B. A solid sphere
• C. A long thin rod
• D. The letter U

Q6. Reshma noticed that her pencil box closed tightly. Which everyday item is most likely to contain a small magnet?

• A. A rubber eraser
• B. A wooden ruler
• C. A pencil-box flap or a purse flap
• D. A plastic water bottle

Q7. Materials that are attracted towards a magnet are called

• A. Non-magnetic materials
• B. Insulators
• C. Magnetic materials
• D. Conductors

Q8. Apart from iron, the other two metals named in the chapter as magnetic materials are

• A. Nickel and cobalt
• B. Copper and aluminium
• C. Silver and gold
• D. Zinc and tin

Q9. Materials that are not attracted towards a magnet are called

• A. Magnetic materials
• B. Non-magnetic materials
• C. Magnetised materials
• D. Inert materials

Q10. From the list — pencil, eraser, iron nail, plastic comb, wooden ruler, paper clip — how many items are non-magnetic?

• A. Two
• B. Three
• C. Four
• D. Five

Q11. In Activity 4.1, what is the correct order of steps a student should follow?

• A. Observe → Predict → Record
• B. Predict → Observe → Record
• C. Record → Predict → Observe
• D. Predict → Record → Observe

Q12. Every magnet has exactly

• A. One pole
• B. Two poles
• C. Three poles
• D. Four poles

Q13. When iron filings are sprinkled over a bar magnet placed on paper, where do most of them stick?

• A. Uniformly all over the magnet
• B. Mainly at the centre
• C. Mainly near the two ends
• D. Only on the top face

Q14. The magnetic effect of a bar magnet is strongest

• A. Exactly at the centre
• B. At the two poles
• C. On the painted surface
• D. At a point one-third from one end

Q15. Can a magnet have a single isolated North pole only?

• A. Yes, if the magnet is strong enough
• B. Yes, if cut into a very tiny piece
• C. No — poles always exist in pairs
• D. Yes, only in U-shaped magnets