KS3 Science - Magnetism Quiz

What is the shape of the magnetic field around a bar magnet?

• Circular lines

• Straight parallel lines

• Lines that curve from the north pole to the south pole

• Random lines

What happens when two north poles of two magnets are brought close together?

• They attract each other

• They repel each other

• They lose their magnetism

• They form a single magnet

Which of the following increases the strength of an electromagnet?

• Reducing the number of coils

• Using a plastic core

• Increasing the current and the number of coils

• Using thinner wire

What is a solenoid?

What is an electromagnet?

• A. A permanent magnet

• B. A coil of wire that produces a magnetic field when current flows through it

• C. A material that blocks magnetic fields

• D. A magnetic field with no electric current

Which of the following is a use of electromagnets in everyday life?

• A. Making permanent magnets

• B. Lifting heavy objects in scrapyards

• C. Blocking magnetic fields in circuits

• D. Producing light in LED bulbs

What causes the aurora borealis (Northern Lights)?

• A. Earth's magnetic field interacting with the Sun's charged particles

• B. Refraction of sunlight through Earth's atmosphere

• C. Electrical discharges in the sky

• D. Heat waves rising to the upper atmosphere

What is Earth's magnetic field most similar to?

• A. The magnetic field of a solenoid

• B. The magnetic field of a bar magnet

• C. The electric field of a charged wire

• D. The gravitational field of the Earth

Why does the core of an electromagnet need to be made of iron?

• A. Iron is a good conductor of electricity

• B. Iron becomes a temporary magnet when current flows through the solenoid

• C. Iron prevents heat loss in the solenoid

• D. Iron reduces resistance in the circuit

How can you reverse the polarity of an electromagnet?

• Increase the number of coils in the solenoid

• Reverse the direction of the electric current

• Use a thicker wire for the solenoid

• Remove the iron core from the solenoid