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WorksheetsMAGNETISM CELEBRATION
Total questions: 44
Worksheet time: 1hrs 28mins
What is magnetic force?
A force that acts between electric charges
A force that acts between magnets or moving electric charges
A force that acts only on stationary objects
A force that acts only in liquids
The interactions of magnets can be described as:
They attract or repel each other depending on their poles.
They always attract each other.
They have no effect on each other.
They only repel each other.
The magnetic field lines of a magnet:
Start from the north pole and end at the south pole outside the magnet.
Start from the south pole and end at the north pole outside the magnet.
Are straight lines between the poles.
Do not form closed loops.
Magnetic declination is:
the angle between magnetic north and true north
the strength of the Earth's magnetic field
the process of magnetizing a material
the distance between two magnetic poles
A magnetic domain is:
A region within a material where the magnetic moments are aligned in the same direction.
A type of electric field.
A particle with a magnetic charge.
A device used to measure magnetism.
Magnetosphere is:
the region around a planet dominated by its magnetic field
the layer of gases surrounding a planet
the solid outer shell of a planet
the process of generating magnetic fields
A ferromagnetic material is:
A material that is strongly attracted by a magnet
A material that does not conduct electricity
A material that is transparent to light
A material that is a good insulator
What will happen if you were to break a magnet in half?
Each piece will become a new magnet with its own north and south poles.
The magnet will lose its magnetism completely.
Only one piece will remain magnetic.
The pieces will attract each other and form a single magnet again.
A magnet can be demagnetized by:
Heating it
Cooling it
Polishing it
Painting it
What creates a magnetic field?
Electric current
Sound waves
Light rays
Heat energy
If the direction of the current in a wire is upward, what is the direction of the magnetic field?
Clockwise around the wire
Counterclockwise around the wire
Upward along the wire
Downward along the wire
A solenoid is:
a coil of wire that acts as a magnet when electric current passes through it
a type of battery
a device used to measure temperature
a kind of resistor
A galvanometer is:
a device used to measure electric current
a device used to measure temperature
a device used to measure pressure
a device used to measure mass
Why is soft iron used as the cores of electromagnets?
Because it retains magnetism permanently
Because it is a good conductor of electricity
Because it easily loses its magnetism when the current is switched off
Because it is cheaper than other materials
What does the electromagnet in a galvanometer do?
It produces a magnetic field to deflect the needle.
It generates electricity for the circuit.
It measures temperature changes.
It amplifies sound signals.
The process of an electric motor involves:
Converting electrical energy into mechanical energy
Converting mechanical energy into electrical energy
Storing electrical energy
Transmitting sound energy
How can voltage be increased in a wire coiled around a magnet?
By increasing the number of coils
By decreasing the number of coils
By using a thinner wire
By reducing the strength of the magnet
Alternating current is:
A current that flows in one direction only.
A current that changes direction periodically.
A current that does not flow at all.
A current that flows only in a vacuum.
Direct current is:
a type of current that changes direction periodically
a type of current that flows only in one direction
a type of current found only in batteries
a type of current used only in homes
Electromagnetic induction is the process by which:
Electric current is produced by changing magnetic fields
Heat is generated by resistance
Light is emitted by a filament
Sound is produced by vibration
What is a generator? What does it do?
A generator is a device that converts mechanical energy into electrical energy.
A generator is a device that stores electrical energy.
A generator is a device that measures electrical energy.
A generator is a device that consumes electrical energy.
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Which of the following is NOT a type of transformer?
Step-up transformer
Step-down transformer
Isolation transformer
Resistor transformer
The output voltage and current of a transformer are determined by:
The number of turns in the primary and secondary coils
The core material only
The input frequency only
The physical size of the transformer
A turbine is:
a device that converts energy from a fluid into mechanical work
a type of electrical circuit
a measuring instrument
a kind of chemical reaction
How are fossil fuels used to generate electrical energy?
By directly converting chemical energy to electrical energy
By burning fossil fuels to heat water, producing steam that turns turbines to generate electricity
By using fossil fuels as conductors in electrical circuits
By freezing fossil fuels to create electrical charges
Where is the magnetic field the strongest in a magnet?
At the center
At the poles
At the sides
At the surface
Magnetic Force is
A force of attraction between any two objects in the universe
A force that acts between objects that are electrically charged
The force of attraction or repulsion between unlike or like poles
A contact force that resist motion between two objects that are touching
Magnetic force can cause
push only
pull only
a push or a pull
no change in motion at all
When a magnet is brought near another magnet, the second magnet moves toward the first. The second magnet moves because of -----i----- force between them which acts ----ii-----
i-Gravitational, ii-Directly
i-Gravitational, ii-Indirectly
i-Magnetic, ii-Indirectly
i-Magnetic, ii-Directly
True or False: All metals are attracted to magnet.
True
False
Which two metals will be attracted by a magnet?
iron and steel
gold and silver
aluminum and lead
copper and cobalt
What would we call a nail that can pick up a paperclip because it is touching a magnet?
temporary magnet
poles
force
detector
What is the main difference between an electromagnet and a permanent magnet?
An electromagnet can be turned on and off, while a permanent magnet cannot.
A permanent magnet can be turned on and off, while an electromagnet cannot.
Electromagnets do not have magnetic poles, while permanent magnets do.
Permanent magnets can only attract materials, while electromagnets can attract and repel.
The ability of some materials to attract certain metals is called
Electricity
Magnetism
Electromagnetism
Atoms
How can the strength of an electromagnet be increased?
By decreasing the current in the coil.
By using a weaker magnetic material for the core.
By decreasing the number of coils.
By increasing the voltage or current to the wires
How can the strength of an electromagnet be increased?
By decreasing the current in the coil.
By using a weaker magnetic material for the core.
By increasing the number of coils.
By using a smaller battery.
Are the magnetic field lines in the picture correct?
Yes, because they point from north to south.
No, because they point from north to south (they're supposed to go the other way).
Yes, because the North pole is on the left in all pictures.
No, because the North pole is on the left in all pictures (it's supposed to be on the right).
The lines on this image are called...
magnetic field lines
iron fillings
graphite lines
none of these
Iron, Nickel and cobalt are all __________________ materials
Shiny
poles
magnetic
cold
Iron filings and a compass are examples of ________________
poles
detectors
temporary magnets
force
Which of the following items cannot be magnetised
Iron Bolt
Plastic Pipe
Nickel Block
Any material that attracts iron or materials containing iron
A. electric generator
B. solenoid
C. magnet
D. magnetic force
What causes the northern lights?
Gravity
Electricity
Friction
Magnetism
What is the main difference between an electromagnet and a permanent magnet?
An electromagnet can be turned on and off, while a permanent magnet cannot.
A permanent magnet can be turned on and off, while an electromagnet cannot.
Electromagnets do not have magnetic poles, while permanent magnets do.
Permanent magnets can only attract materials, while electromagnets can attract and repel.
