WorksheetsPHYSICS_GRADE 7_LIGHT and COLOURS and MAGNETISM
Total questions: 45
Worksheet time: 23mins
What colours is white light made from?
Orange, Green, Pink, Magenta, Peach, Rose, Lemon
Red, Orange Yellow, Green, Black, Indigo, Violet
Red, Orange, Yellow, Green, Blue, Indigo, Violet
Red, Orange, Yellow, Grey, Blue, Indigo, Violet
Which image correctly shows how light would interact with the t-shirt and shorts?
A
B
C
D
Why does this the t-shirt appear red and the shorts appear blue?
The t-shirt reflects red light, the shorts reflect green light, other colours are absorbed.
The t-shirt reflects blue light, the shorts reflect red light, other colours are absorbed.
The t-shirt reflects red light, the shorts absorb yellow light, all other colours are reflected
The t-shirt reflects red light, the shorts reflect blue light, other colours are absorbed.
What is the correct reason why a blue filter and a green filter produce coloured light?
The blue filter allows blue light to pass through, the green filter allows green light to pass through, others colours are absorbed.
The blue filter reflects blue light, the green filter reflects green light, other colours are absorbed.
Which image correctly shows how a magenta filter and a yellow filter produce coloured light?
A
B
What are the correct reasons why a magenta filter and a yellow filter produce coloured light?
Magenta and yellow filters allow only one wavelength (colour) of light to pass through.
Magenta and yellow filters allow primary colours of light to pass through. These colours mix to make yellow and magenta.
Magenta and yellow are primary colours of light
Magenta and yellow absorb the other colours
When a rainbow is formed outside naturally, what causes the light to refract?
Small raindrops
Tiny mirrors
concave mirror
convex mirror
Which explains why the fork looks different under water?
light can't pass through the glass
the wavelength of light lengthens
the amount of light increases when going through water
light is refracted at an angle
Why do we see objects as white?
They absorb all light
They reflect all light
They absorb some light and reflect some light
They reflect none of the colours of light
Another name for light bending is ....
Reflection
Absorbing
Refraction
Mirroring
The Law of Reflection:
The angle of incidence is _________ the angle of reflection
bigger than
the same as
smaller than
What three things may happen to light that strikes an object?
The light may be reflected, transmitted or absorbed.
The light may be reflected and refracted.
The light may be absorbed and transmitted.
An actorś red shirt and blue pants both appear black. What color is the stage light shining on the actor?
Blue
Red
Magenta
Green
The two kinds of reflection are
transparent and translucent
opaque and translucent
regular and diffuse
This is used to separate white light into colors.
prism
reflection
plane mirror
sunlight
Light travels ___________.
backwards
in curves
in a straight line
at a right angle
What do water droplets in a rainbow act like?
reflectors
rays of light
lasers
prisms
What color appears when all colors are absorbed?
black
red
white
violet
Materials that allow light to pass through them clearly are called transparent. Which of the following materials is NOT transparent?
window glass
a mirror
clean air
water
Materials such as wood and metal do not let light travel through them. They are said to be ______________.
invisible
opaque
translucent
transparent
If you place the North pole of a magnet next to the South pole of another magnet, they will:
Shatter
Repel
Do nothing
Attract
What do the lines around this magnet represent?
North Pole
South Pole
Magnetic Declination
Magnetic Field
As the distance between two magnets increases (they get farther apart), the force between them:
Increases
Decreases
Stays the Same
If you cut a magnet in half, what happens to the poles?
One half gets the North Pole, the other half gets the South Pole
Both halves get only a North Pole
Both halves get only a South Pole
Both halves get a North pole and a South Pole
A paper clip is an example of a:
permanent magnet
bar magnet
insulator
magnetic material
If the North Pole of a permanent magnet is placed next to a compass as seen in the picture, which direction will the needle move?
Clockwise
Counter-clockwise
It will not move
Need more information
An electromagnet's poles may be reversed by:
decreasing the current in the coil
increasing the number of coils
changing the direction of current flow
altering the material used to make the coils
What would we call a nail that can pick up a paperclip because it is touching a magnet?
poles
temporary magnet
force
detector
What is an electromagnet?
a magnet that creates an electric current
a magnet created by an electric current
a magnet that has an electric charge
an electric charge that is magnetic
Two ways to increase the magnetic force of an electro-magnet
Increase the current flow, reduce the number of coils
Increase the voltage, decrease the number of coils
Increase the number of coils and the current flow
Spread out the coils, replace iron core with rubber
Electric current passing through a wire produces ________
permanent magnet
magnetic field around wire
compass
geographic poles
GLASS
Magnetic or Non-Magnetic?
magnetic
non-magnetic
NICKEL
Magnetic or
Non-Magnetic?
magnetic
non-magnetic
How is a permanent magnet DIFFERENT from a temporary magnet?
A permanent magnet attracts materials made of iron.
A permanent magnet has poles.
A permanent magnet has a magnetic field.
A permanent magnet keeps its magnetism for a long time.
Which of the following is NOT part of an electromagnet?
Wire
Iron
Toothpick
Power source
How many poles does a magnet have?
1
3
2
4
Magnets that are arranged like this will _______.
move away from each other (repel)
move towards each other (attract)
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
Reverse the poles of the magnet.
Remove all the coils and the nail.
Use a smaller battery.
Add more coils of wire to the nail.
What is the device seen here?
generator
electric motor
electromagnet
magnet
Magnets attract things made of
copper
iron
wood
plastic
Which is NOT a use of magnets?
Generating electricity
Holding cabinet doors closed
Sorting paper from plastic
Storing information on computer hard drives.
Which of these can move a nail lying on the table without touching the nail?
A magnet
String
A wire
A ruler
A magnet will pick up a nail, but not a penny because the nail
has rust on it.
is lighter than the penny.
has a sharp point.
contains iron.
Which of the following is NOT magnetic?
zinc
iron
cobalt
nickel
Which will make an electromagnet WEAKER?
more coils of wire around nail
thicker wire
an extra battery attached
remove one of the nails from the coils
