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

Which can be picked up by a magnet? [8j-1]

iron nail
aluminium can
plastic comb
graphite rod

Which can be picked up by a magnet? [8j-2]

copper nail
nickel plate
paper boat
wooden rod

Which can be picked up by a magnet? [8j-3]

brass door handle
aluminium can
steel paper clip
ceramic bowl

Which can be picked up by a magnet? [8j-4]

pewter mug
aluminium screw
plastic fork
tinned steel can

Which can be picked up by a magnet? [8j-5]

cobalt plate
aluminium screw
plastic fork
pewter mug

Which of the following is TRUE? [8j-6]

if object x is attacted by a magnet, x must be a magnet
unlike poles attract
like poles have no effect on each other
if object x is repelled by a magnet, x cannot be a magnet

Which of the following is TRUE? [8j-7]

if object x is attacted by a magnet, x must be a magnet
magnetic forces cannot act through non-magnetic materials
like poles repel
if object x is repelled by a magnet, x cannot be a magnet

Which of the following is TRUE? [8j-8]

if object x is attacted by a magnet, x must be a magnet
magnetic forces cannot act through non-magnetic materials
like poles have no effect on each other
if object x is repelled by a magnet, x must be a magnet

Which of the following is TRUE? [8j-9]

if object x is attacted by a magnet, x may be a magnet
magnetic forces cannot act through non-magnetic materials
like poles have no effect on each other
if object x is repelled by a magnet, x cannot be a magnet

Which of the following is TRUE? [8j-10]

if object x is attacted by a magnet, x must be a magnet
magnetic forces can act through non-magnetic materials
unlike poles have no effect on each other
if object x is repelled by a magnet, x cannot be a magnet

Which of the following is TRUE? [8j-11]

if object x is attacted by a magnet, x must be a magnet
unlike poles have no effect on each other
magnetic forces cannot act through magnetic materials
if object x is repelled by a magnet, x cannot be a magnet

Which of the following is TRUE? [8j-12]

if object x is attacted by a magnet, x must be a magnet
magnetic forces cannot act through non-magnetic materials
magnetic forces can act through magnetic materials
magnetic materials can be made into a magnet by stroking with the pole of a magnet

Which of the following is TRUE? [8j-13]

a freely moving magnet comes to rest pointing in a north-south direction
magnetic forces cannot act through non-magnetic materials
magnetic forces can act through magnetic materials
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]

a freely moving magnet comes to rest pointing in an east-west direction
the Earth's geographic north pole is actually the south pole of the Earth's magnetic field
magnetic forces can act through magnetic materials
unlike poles have no effect on each other

Which of the following is TRUE? [8j-15]

the magnetic field of a bar magnet goes from the south pole to the north pole
the Earth's geographic north pole is actually the north pole of the Earth's magnetic field
if two pieces of metal repel each other, they are both a magnet
unlike poles have no effect on each other

Which of the following is TRUE? [8j-16]

a freely moving magnet comes to rest pointing in an east-west direction
the Earth's geographic south pole is actually the south pole of the Earth's magnetic field
if two pieces of metal repel each other, neither can be a magnet
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]

magnetic force field
electrical force field
gravitational force field
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]

hard steel
soft iron
malleable copper
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]

to hold the coil in place
to ensure it is a good electrical conductor
to concentrate the magnetic field produced
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]

steel wire
insulated steel wire
bare copper wire
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]

its strong, magnetic and a good electrical conductor
its strong, high melting and a good conductor of heat
its high melting, strong but flexible and a good electrical conductor
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]

to keep the electrical circuit complete
to ensure the contacts stay together
to spring back the contacts on current overload
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]

the rocker heats up and bends away from the upper contact breaking the circuit
the end of the rocker melts breaking the circuit
the magnetic field increases sufficiently for the soft iron core to attract the rocker breaking the circuit
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]

make the radius of the coils larger
make the core longer
use thinner wire
add more coils of wire around the core

Which of the following is TRUE? [8j-25]

soft iron makes a good temporary magnet
steel makes a poor permanent magnet
iron is a poor magnetic shield
copper is a good magnetic shield

Which of the following is TRUE? [8j-26]

soft iron makes a poor temporary magnet
steel makes a good permanent magnet
iron is a poor magnetic shield
copper is a good magnetic shield

Which of the following is TRUE? [8j-27]

soft iron makes a good permanent magnet
steel makes a good temporary magnet
iron is a good magnetic shield
copper is a good magnetic shield

Which of the following is TRUE? [8j-28]

soft iron makes a good permanent magnet
steel makes a good temporary magnet
iron is a poor magnetic shield
copper is a poor magnetic shield

Which of the following is TRUE? [8j-29]

steel is a good magnetic shield
iron in contact with a magnet cannot become a magnet
aluminium is a good magnetic shield
only iron, and not steel, can be magnetised inside wire coils of an electric circuit

Which of the following is TRUE? [8j-30]

steel is a poor magnetic shield
iron in contact with a magnet becomes a magnet
aluminium is a good magnetic shield
only iron, and not steel, can be magnetised inside wire coils of an electric circuit

Which of the following is TRUE? [8j-31]

steel is a poor magnetic shield
iron in contact with a magnet cannot become a magnet
aluminium is a poor magnetic shield
only iron, and not steel, can be magnetised inside wire coils of an electric circuit

Which of the following is TRUE? [8j-32]

steel is a poor magnetic shield
iron in contact with a magnet cannot become a magnet
aluminium is a good magnetic shield
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]

NOTHING
REPEL
ATTRACT

WHAT HAPPENS when the two magnets are brought together? [8j-34]

NOTHING
REPEL
ATTRACT

WHAT HAPPENS when the two magnets are brought together? [8j-35]

NOTHING
REPEL
ATTRACT

WHAT HAPPENS when aluminium and a steel magnet are brought together? [8j-36]

NOTHING
REPEL
ATTRACT

WHAT HAPPENS when the two magnets are brought together? [8j-37]

NOTHING
REPEL
ATTRACT

WHAT HAPPENS when the two magnets are brought together? [8j-38]

NOTHING
REPEL
ATTRACT

WHAT HAPPENS when the two magnets are brought together? [8j-39]

THEY VIBRATE
THEY DO NOTHING
THEY ATTRACT
THEY REPEL

WHAT HAPPENS when the two magnets are brought together? [8j-40]

THEY VIBRATE
THEY DO NOTHING
THEY REPEL
THEY ATTRACT

Various rods are placed inside a transparent plastic tube surrounded with coils of insulated wire. Which is TRUE for the effect of switching the d.c. current ON and OFF in the three circuits shown above? [8j-41]

when current switched ON the two rods repel in coil 3
when current switched OFF nothing happens to the rods in coil 3
when current switched ON nothing happens to the rods in coil 5
when current switched ON the two rods attract in coil 4

Various rods are placed inside a transparent plastic tube surrounded with coils of insulated wire. Which is TRUE for the effect of switching the d.c. current ON and OFF in the three circuits shown above? [8j-42]

when current switched ON nothing happens to the rods in coil 3
when current switched OFF the two rods roll back in coil 3
when current switched ON nothing happens to the rods in coil 5
when current switched ON the two rods attract in coil 4

Various rods are placed inside a transparent plastic tube surrounded with coils of insulated wire. Which is TRUE for the effect of switching the d.c. current ON and OFF in the three circuits shown above? [8j-43]

when current switched ON nothing happens to the rods in coil 3
when current switched OFF nothing happens to the rods in coil 3
when current switched ON the two rods repel in coil 5
when current switched ON the two rods attract in coil 4

Various rods are placed inside a transparent plastic tube surrounded with coils of insulated wire. Which is TRUE for the effect of switching the d.c. current ON and OFF in the three circuits shown above? [8j-44]

when current switched ON nothing happens to the rods in coil 3
when current switched OFF nothing happens to the rods in coil 3
when current switched ON nothing happens to the rods in coil 5
when current switched ON nothing happens to the two rods in coil 4

Various rods are placed inside a transparent plastic tube surrounded with coils of insulated wire. Which is TRUE for the effect of switching the d.c. current ON and OFF in the three circuits shown above? [8j-45]

when current switched OFF the rods stay apart in coil 5
when current switched OFF nothing happens to the rods in coil 3
when current switched ON nothing happens to the rods in coil 5
when current switched ON the two rods attract in coil 4

Which is TRUE for the effect of switching ON the d.c. in the two circuits shown above? [8j-46]

there is no magnetic field outside coil 2
there is a magnetic field produced in coil 1
the iron rod weakens the magnetic field in coil 2
there is a much stronger magnetic field produced in coil 1

Which is TRUE for the effect of switching ON the d.c. in the two circuits shown above? [8j-47]

there is no magnetic field outside coil 2
there is no magnetic field produced in coil 1
the iron rod strengthens the magnetic field in coil 2
there is a much stronger magnetic field produced in coil 1

Which is TRUE for the effect of switching ON the d.c. in the two circuits shown above? [8j-48]

there is no magnetic field outside coil 2
there is no magnetic field produced in coil 1
the iron rod weakens the magnetic field in coil 2
there is a much stronger magnetic field produced in coil 2

You are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 1? [8j-49]

You are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 2? [8j-50]

>You are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 3? [8j-51]

You are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 4? [8j-52]

You are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 5? [8j-53]

You are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 2? [8j-54]

: with current flowing : away from apparatus

You are shown the direction a compass would point on the right hand side of the coil when current is flowing and when it is far away from the apparatus. Two iron rods have been placed inside the coil and the switch closed to allow current flow. Predict the compass bearing for the magnetic field if the battery connections are switched round and the current turned on again? [8j-55]

: with current flowing : away from apparatus

You are shown the direction a compass would point on the right hand side of the coil when current is flowing and when it is far away from the apparatus. Two iron rods have been placed inside the coil and the switch closed to allow current flow. Predict the compass bearing for the magnetic field if the current is switched off after being on for 10 minutes? [8j-55]

: with current flowing : away from apparatus

You are shown the direction a compass would point on the right hand side of the coil when current is flowing and when it is far away from the apparatus. Two steel rods have been placed inside the coil and the switch closed to allow current flow. Predict the compass bearing for the magnetic field if the battery connections are switched round with the current turned on again? [8j-57]

: with current flowing : away from apparatus

You are shown the direction a compass would point on the right hand side of the coil when current is flowing and when it is far away from the apparatus. Two steel rods have been placed inside the coil and the switch closed to allow current flow. Predict the compass bearing for the magnetic field if the current is switched on for five minutes, and then switched off? [8j-58]

WHAT HAPPENS when two iron blocks are brought together? [8j-59]

NOTHING
REPEL each other
ATTRACT each other
start to VIBRATE

WHAT HAPPENS when a steel bar magnet and an iron block are brought together? [8j-60]

NOTHING
REPEL each other
ATTRACT each other
start to VIBRATE

WHAT HAPPENS when a copper block and steel bar magnet are brought together? [8j-61]

REPEL each other
NOTHING
ATTRACT each other
start to VIBRATE

WHAT HAPPENS when two steel blocks are brought together? [8j-62]

start to VIBRATE
REPEL each other
ATTRACT each other
NOTHING

Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-63]

arrangement in expt. 1
arrangement in expt. 7
arrangement in expt. 11
arrangement in expt. 13

Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-64]

arrangement in expt. 3
arrangement in expt. 5
arrangement in expt. 10
arrangement in expt. 12

Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-65]

arrangement in expt. 4
arrangement in expt. 6
arrangement in expt. 8
arrangement in expt. 15

Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-66]

arrangement in expt. 4
arrangement in expt. 17
arrangement in expt. 12
arrangement in expt. 9

Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-67]

arrangement in expt. 2
arrangement in expt. 17
arrangement in expt. 6
arrangement in expt. 13

Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-68]

arrangement in expt. 3
arrangement in expt. 14
arrangement in expt. 7
arrangement in expt. 15

Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-69]

arrangement in expt. 3
arrangement in expt. 6
arrangement in expt. 16
arrangement in expt. 11

Two blocks of iron are placed inside a coil through which a current is passed. Which of the following statements is NOT correct? [8j-70]

the blocks of iron become very slowly magnetised
the bocks of iron move towards each other
the poles of the iron blocks will be [N-S] [N-S] or [S-N] [S-N] depending on the direction of current flow
the iron blocks stay together even after the current is switched off

Two blocks of iron are placed inside a coil through which a current is passed. Which of the following statements is NOT correct? [8j-71]

the blocks of iron become quickly magnetised
the bocks of iron repel each other
the poles of the iron blocks will be [N-S] [N-S] or [S-N] [S-N] depending on the direction of current flow
the iron blocks stay together even after the current is switched off

Two blocks of iron are placed inside a coil through which a current is passed. Which of the following statements is NOT correct? [8j-72]

the blocks of iron become quickly magnetised
the bocks of iron move towards each other
the poles of the iron blocks will be [N-S] [S-N] or [S-N] [N-S] depending on the direction of current flow
the iron blocks stay together even after the current is switched off

Two blocks of iron are placed inside a coil through which a current is passed. Which of the following statements is NOT correct? [8j-73]

the blocks of iron become quickly magnetised
the bocks of iron move towards each other
the poles of the iron blocks will be [N-S] [N-S] or [S-N] [S-N] depending on the direction of current flow
the iron blocks will repel each other after the current is switched off

What material should a compass needle be made of? [8j-74]

iron
brass
aluminium
steel

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

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