KS3 Science-Physics Quiz on "MAGNETS and ELECTROMAGNETS" (based on QCA 8J)

Which can be picked up by a magnet? [8j-1]
1. iron nail
2. aluminium can
3. plastic comb
4. graphite rod
Which can be picked up by a magnet? [8j-2]
1. copper nail
2. nickel plate
3. paper boat
4. wooden rod
Which can be picked up by a magnet? [8j-3]
1. brass door handle
2. aluminium can
3. steel paper clip
4. ceramic bowl
Which can be picked up by a magnet? [8j-4]
1. pewter mug
2. aluminium screw
3. plastic fork
4. tinned steel can
Which can be picked up by a magnet? [8j-5]
1. cobalt plate
2. aluminium screw
3. plastic fork
4. pewter mug
Which of the following is TRUE? [8j-6]
1. if object x is attacted by a magnet, x must be a magnet
2. unlike poles attract
3. like poles have no effect on each other
4. if object x is repelled by a magnet, x cannot be a magnet
Which of the following is TRUE? [8j-7]
1. if object x is attacted by a magnet, x must be a magnet
2. magnetic forces cannot act through non-magnetic materials
3. like poles repel
4. if object x is repelled by a magnet, x cannot be a magnet
Which of the following is TRUE? [8j-8]
1. if object x is attacted by a magnet, x must be a magnet
2. magnetic forces cannot act through non-magnetic materials
3. like poles have no effect on each other
4. if object x is repelled by a magnet, x must be a magnet
Which of the following is TRUE? [8j-9]
1. if object x is attacted by a magnet, x may be a magnet
2. magnetic forces cannot act through non-magnetic materials
3. like poles have no effect on each other
4. if object x is repelled by a magnet, x cannot be a magnet
Which of the following is TRUE? [8j-10]
1. if object x is attacted by a magnet, x must be a magnet
2. magnetic forces can act through non-magnetic materials
3. unlike poles have no effect on each other
4. if object x is repelled by a magnet, x cannot be a magnet
Which of the following is TRUE? [8j-11]
1. if object x is attacted by a magnet, x must be a magnet
2. unlike poles have no effect on each other
3. magnetic forces cannot act through magnetic materials
4. if object x is repelled by a magnet, x cannot be a magnet
Which of the following is TRUE? [8j-12]
1. if object x is attacted by a magnet, x must be a magnet
2. magnetic forces cannot act through non-magnetic materials
3. magnetic forces can act through magnetic materials
4. magnetic materials can be made into a magnet by stroking with the pole of a magnet
Which of the following is TRUE? [8j-13]
1. a freely moving magnet comes to rest pointing in a north-south direction
2. magnetic forces cannot act through non-magnetic materials
3. magnetic forces can act through magnetic materials
4. the Earth's geographic north pole is actually the north pole of the Earth's magnetic field
Which of the following is TRUE? [8j-14]
1. a freely moving magnet comes to rest pointing in an east-west direction
2. the Earth's geographic north pole is actually the south pole of the Earth's magnetic field
3. magnetic forces can act through magnetic materials
4. unlike poles have no effect on each other
Which of the following is TRUE? [8j-15]
1. the magnetic field of a bar magnet goes from the south pole to the north pole
2. the Earth's geographic north pole is actually the north pole of the Earth's magnetic field
3. if two pieces of metal repel each other, they are both a magnet
4. unlike poles have no effect on each other
Which of the following is TRUE? [8j-16]
1. a freely moving magnet comes to rest pointing in an east-west direction
2. the Earth's geographic south pole is actually the south pole of the Earth's magnetic field
3. if two pieces of metal repel each other, neither can be a magnet
4. the magnetic field of a bar magnet goes from the north pole to the south pole
The sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What useful effect does the coil produce? [8j-17]
1. magnetic force field
2. electrical force field
3. gravitational force field
4. nuclear force field
The sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. To make the magnetic field effect of the coil stronger what should the core be made of?? [8j-18]
1. hard steel
2. soft iron
3. malleable copper
4. alloyed aluminium
The sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What is the purpose of the soft iron core? [8j-19]
1. to hold the coil in place
2. to ensure it is a good electrical conductor
3. to concentrate the magnetic field produced
4. to allow efficient conduction of heat to keep the switch cool at higher currents
The sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What should the coil surrounding the core be made of? [8j-20]
1. steel wire
2. insulated steel wire
3. bare copper wire
4. insulated copper wire
The sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. Which are the best combination of reasons why the rocker should be made of iron? [8j-21]
1. its strong, magnetic and a good electrical conductor
2. its strong, high melting and a good conductor of heat
3. its high melting, strong but flexible and a good electrical conductor
4. its strong, magnetic and won't corrode easily
The sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What is the purpose of the 'springy piece of steel? [8j-22]
1. to keep the electrical circuit complete
2. to ensure the contacts stay together
3. to spring back the contacts on current overload
4. to act as a switch control
The sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What happens if there is an unsafe increase in current? [8j-23]
1. the rocker heats up and bends away from the upper contact breaking the circuit
2. the end of the rocker melts breaking the circuit
3. the magnetic field increases sufficiently for the soft iron core to attract the rocker breaking the circuit
4. the spring breaks allowing the contacts to move apart breaking the circuit
The sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. How can the strength of the magnetic field of the coil be increased without change in the current? [8j-24]
1. make the radius of the coils larger
2. make the core longer
3. use thinner wire
4. add more coils of wire around the core
Which of the following is TRUE? [8j-25]
1. soft iron makes a good temporary magnet
2. steel makes a poor permanent magnet
3. iron is a poor magnetic shield
4. copper is a good magnetic shield
Which of the following is TRUE? [8j-26]
1. soft iron makes a poor temporary magnet
2. steel makes a good permanent magnet
3. iron is a poor magnetic shield
4. copper is a good magnetic shield
Which of the following is TRUE? [8j-27]
1. soft iron makes a good permanent magnet
2. steel makes a good temporary magnet
3. iron is a good magnetic shield
4. copper is a good magnetic shield
Which of the following is TRUE? [8j-28]
1. soft iron makes a good permanent magnet
2. steel makes a good temporary magnet
3. iron is a poor magnetic shield
4. copper is a poor magnetic shield
Which of the following is TRUE? [8j-29]
1. steel is a good magnetic shield
2. iron in contact with a magnet cannot become a magnet
3. aluminium is a good magnetic shield
4. only iron, and not steel, can be magnetised inside wire coils of an electric circuit
Which of the following is TRUE? [8j-30]
1. steel is a poor magnetic shield
2. iron in contact with a magnet becomes a magnet
3. aluminium is a good magnetic shield
4. only iron, and not steel, can be magnetised inside wire coils of an electric circuit
Which of the following is TRUE? [8j-31]
1. steel is a poor magnetic shield
2. iron in contact with a magnet cannot become a magnet
3. aluminium is a poor magnetic shield
4. only iron, and not steel, can be magnetised inside wire coils of an electric circuit
Which of the following is TRUE? [8j-32]
1. steel is a poor magnetic shield
2. iron in contact with a magnet cannot become a magnet
3. aluminium is a good magnetic shield
4. both iron and steel can be magnetised inside wire coils of an electric circuit
WHAT HAPPENS when brass and a steel magnet are brought together? [8j-33]
1. NOTHING
2. REPEL
3. ATTRACT<

KS3 Science-Physics Quiz on "MAGNETS and ELECTROMAGNETS" (based on QCA 8J)

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