WorksheetsScience 8 Online Revision 5
Total questions: 50
Worksheet time: 2hrs 0mins
A scientist is using a color filter in her experiment. What would be true if she was using a green color filter?
The color filter will only absorb green light.
The color filter will only transmit colors of light other than green.
Objects seen through a green filter will look green if the objects absorb green light.
Non-green objects will appear black because other wavelengths are absorbed by the filter.
An apple is placed in front of a curved mirror. How would the reflected image of the apple look in the curved mirror?
W
X
Y
Z
Which part of the eye has tiny, light-sensitive parts that that transfer the energy of the light wave as impulses to the brain for interpretation?
convex lens
cornea
optic nerve
retina
What causes an object to appear black?
The object reflects black wavelengths
The object absorbs black wavelengths
The object reflects all wavelengths of light.
The object absorbs all wavelengths of light.
A speaker produces a sound wave that is directed toward an object. The image shows what happens to the sound wave once it touches the object. What is true about a sound wave?
The sound wave is reflected by the object, causing an echo
The sound wave is refracted by the object, changing the wave's direction
The sound wave is absorbed by the object, increasing the wave's volume
The sound wave is transmitted by the object, reducing the volume of the sound
Two objects (A and B) are placed on a table. Object A reflects red light and absorbs all other colors, while object B reflects green light and absorbs all other colors. What color will the objects appear?
Object A will appear red, and object B will appear green
Object A will appear black, and object B will appear white
Object A will appear white, and object B will appear black
Object A will appear green, and object B will appear red
While visiting a historical fort, John watched a demonstration of the firing of an old cannon from a distance of 50 m. When the cannon fired, John heard a loud boom a second later. What was the medium that allowed the sound waves to reach John?
the air
the cannon
the ears
the ground
Two sound waves of different frequencies interfere and produce a resulting waveform shown with four points (W, X, Y, and Z) marked on the new wave. At which point will the sound be the loudest?
W
X
Y
Z
Examine the diagram of the wave. What is the wavelength of the wave in the diagram?
1 meter
2 meters
180 meters
360 meters
If the speed of a sound wave increases, what other property of the wave must also increase when all other wave properties are held constant?
Amplitude
Frequency
Loudness
Wavelength
Where is DNA stored in a eukaryotic cell?
cell walls
nucleus
chloroplasts
lysosomes
In which organelle does photosynthesis occur?
lysosomes
mitochondrion
nucleus
chloroplasts
What three organelles do plants have that animals do not?
cell wall, chloroplasts, large central vacuole
chloroplasts, cell membrane, mitochondrion
cell wall, lysosomes, nucleus
lysosomes, mitochondrion, cell membrane
What happens when water vapor comes in contact with a cold surface?
melting
condensation
evaporation
boils
Anything that takes up space and has mass is called
water
air
solid
matter
How an object feels to the touch is
matter
mass
states of matter
texture
How can you measure temperature?
With a scale
With a thermometer
With a graduated cylinder
With a balance
When a puddle disappears outside what has happened?
evaporation
condensation
freezing
melting
What is the green pigment that "traps" sunlight?
Chlorophyll
Chloroplasts
Photosynthesis
ATP
How does most of the water needed by the plant get into its leaves?
It enters through the stomata
The roots absorb it and then it travels up the xylem
It's made during a chemical reaction in the stem
The flowers capture water and deliver it to the leaves
Exit: Carbon dioxide
Exit: Glucose
Exit: Oxygen
Exit: Water vapor
The moon's surface is visible to an observer on Earth because the moon
reflects sunlight
absorbs light from Earth
produces its own light
transmits sunlight it has stored
The diagram represents Earth orbiting the Sun. Approximately how long does it take Earth to complete one orbit around the Sun?
1 year
1 month
1 day
23.5o
Earth’s tilt on its axis is the cause of the seasons in the Northern and Southern Hemispheres. What is the approximate angle of Earth’s tilt?
365°
23.5°
90°
180°
The diagram shows Earth at four locations in its orbit around the Sun. Which motion do the arrows in the diagram represent?
Earth's rotation
the sun's rotation
Earth's revolution
the sun's revolution
The diagram represents the motion of the Moon around Earth as seen from above the North Pole. One position of the Moon in its orbit is shown. Which Moon phase will usually be seen from Earth when the Moon is in this position?
The time it takes the moon to revolve once around Earth is approximately one
day
month
week
year
The diagram below shows the positions of the Sun, Earth, and the Moon as seen from space. Which event is caused by the Moon passing through Earth’s shadow?
a meteor shower
a change of seasons
an eclipse
an earthquake
A bright object with a long tail of glowing gases is in orbit around the Sun. This object is most likely
a planet
a star
an asteroid
a comet
What effect does the moon have on Earth?
causes Earth to rotate faster
causes Earth to revolve around the sun faster
causes tides in Earth's oceans
has no effect on Earth
The photograph below shows an object in space that has an icy core with 2 tails of plasma and dust extending for millions of kilometers. The object is most likely
a star
a comet
a moon
an asteroid
The length of one day on Earth is determined by how long it takes
the moon to revolve once
the moon to rotate once
Earth to rotate once
Earth to revolve once
