Fun with Magnets quiz

A natural magnet is:

Which of these is attracted by a magnet?

A freely suspended magnet comes to rest in the:

Like poles of two magnets:

The attraction of a bar magnet is strongest:

A compass needle is a:

A magnet has:

Magnets lose their properties if they are:

Which of the following is a non-magnetic material?

Unlike poles of two magnets:

Name the three shapes in which magnets are commonly made. (2 marks)

Why is a compass useful for travellers? (2 marks)

Can a magnet have only one pole? Explain. (2 marks)

How is a magnet used in a refrigerator door? (2 marks)

How can you find the north pole of an unmarked bar magnet? (2 marks)

Why should magnets be kept away from TV sets and computers? (2 marks)

What happens when a magnet is brought near a heap of iron pins? (2 marks)

Name two objects in your home that contain magnets. (2 marks)

Why is repulsion a surer test of magnetism than attraction? (2 marks)

How can you make a compass at home with a needle and a cork? (2 marks)

A student tested 15 objects with a magnet. 6 were attracted. How many were not attracted? What fraction of the objects were magnetic? (3 marks)

A bar magnet held over pins picked up 25 pins at the N end, 23 pins at the S end and none in the middle. Find the total. If the magnet is weakened by dropping and picks up 40 percent fewer pins at the N end, how many does that end now pick up? (3 marks)

Two ring magnets are placed on a pencil. When like poles face each other, the upper magnet floats 2 cm above the lower one. If a third ring magnet is added with like poles facing, what will happen? What happens if one magnet is flipped over? (3 marks)

A ship sails using a compass. It travels 30 km north and then 40 km east. Name the directions the compass needle points throughout. In which two directions did the ship travel, and what is the total distance travelled? (3 marks)

A scrap dealer separates 500 kg of mixed metal scrap with a large electromagnet. If 60 percent of the scrap is iron and steel, how much is picked up by the magnet? How much remains? Name two metals that may remain. (3 marks)

Read the passage and answer the questions. A long time ago, a shepherd named Magnes was grazing his sheep on a mountain. He found that the iron tip of his stick and the nails of his shoes were pulled towards a rock. The rock was later named after him. (i) What was the rock made of? (ii) Why were the stick's tip and nails attracted? (iii) Name one more material that such a rock would attract. (5 marks)

Read the passage and answer the questions. Riya hung a bar magnet with a thread from a wooden stand. It swung for some time and then stopped. She turned it in another direction and released it, but it came to rest in the same direction again. (i) In which direction did the magnet come to rest? (ii) What is the end pointing north called? (iii) Name a device that uses this property. (5 marks)

Read the passage and answer the questions. Arjun had two toy cars, each with a bar magnet fixed on the top. When he brought the cars close with their front ends facing each other, they moved away from each other. When he turned one car around, they moved towards each other. (i) Why did the cars move away at first? (ii) Why did they move towards each other later? (iii) State the rule shown here. (5 marks)

Read the passage and answer the questions. Mohit's teacher gave him an iron needle and a bar magnet. He stroked the needle with one pole of the magnet many times in one direction. Then he brought the needle near some pins. (i) What happened to the pins? (ii) Why did the needle attract the pins? (iii) How can Mohit check which end of the needle is its north pole? (5 marks)

Read the passage and answer the questions. A science teacher keeps the school's bar magnets in a wooden box in pairs, with opposite poles side by side, a piece of wood between them and two soft iron pieces across the ends. (i) Why are magnets kept in pairs with unlike poles on the same side? (ii) What are the soft iron pieces called? (iii) Name two things that can make a magnet lose its magnetism. (5 marks)

Describe an activity to show that the attraction of a magnet is strongest at its poles. Draw a labelled diagram of a bar magnet with iron filings. Explain the observations. (6 marks)

Describe the stroking method of making a magnet from an iron strip. Draw a labelled diagram showing the direction of stroking. Explain how you would test the magnet you made. (6 marks)

Draw a labelled diagram of a compass. Explain how it shows direction and how to use it to find north. Describe how to make a simple compass using a magnetised needle floating on water. (6 marks)

Draw diagrams showing attraction and repulsion between the poles of two bar magnets for all combinations of poles. Explain the rule, and describe how repulsion can be used to test whether an object is a magnet. (6 marks)

List four uses of magnets in daily life and four precautions for storing and handling magnets. Draw a labelled diagram of magnets stored with keepers and explain why this keeps them strong. (6 marks)