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WorksheetsScience 8 Diagnostic (Fall 2020)
Total questions: 40
Worksheet time: 20mins
A boy and a girl are sledding down a hill. The boy and the girl weigh the same, and they are using sleds that weigh the same.
If the boy and girl are sledding at the same speed, which child has more motion energy (kinetic energy)?
The boy has more motion energy
The girl has more motion energy.
Both of them have the same amount of motion energy.
Neither the boy nor the girl has any motion energy.
Which of the following statements is TRUE if a moving object is slowing down?
A force within the object must be decreasing.
A force that is pulling or pushing the object forward must be decreasing.
A force that is causing the object to slow down must be increasing.
A force that is causing the object to slow down must be greater than the sum of the forces that are pulling or pushing the object forward.
What will happen to an object that is moving forward if a force pushing it backward is greater than the force pushing it forward?
The object will move at constant speed for a while and then slow down and stop.
The object will slow down for a while and then move at a slower constant speed.
The object will slow down, stop, and then begin to move faster and faster in the opposite direction.
The object will slow down, stop, and then begin to move at a constant speed in the opposite direction.
A ball is thrown straight up into the air. What happens to the ball’s speed as it goes up and as it comes down?
The ball goes up at a constant speed, stops, and then comes down at a constant speed.
The ball goes up at a constant speed, stops, and then moves faster and faster as it comes down.
The ball moves slower and slower as it goes up, stops, and then comes down at a constant speed.
The ball moves slower and slower as it goes up, stops, and then moves faster and faster as it comes down.
The motion energy (kinetic energy) of an object depends on which of the following?
Both the mass and the speed of the object.
The mass of the object but not the speed of the object.
The speed of the object but not the mass of the object.
Neither the mass nor the speed of the object.
Object 1 and Object 2 are traveling at the same speed, but the motion energy (kinetic energy) of Object 1 is greater than the motion energy of Object 2. Does Object 1 weigh more than, less than, or the same as Object 2?
Object 1 weighs more than Object 2.
Object 1 weighs less than Object 2.
Object 1 weighs the same as Object 2.
More information is needed to compare the weights of the objects.
In the drawing below, the arrows labeled Force 1 and Force 2 represent two forces acting on an object. The directions of the arrows show the directions of the forces, and the lengths of the arrows represent the strengths of the forces. Which drawing below shows the net force on the object?
Jeremy took a styrofoam cup and rubbed it with some plastic wrap.
Next he borrowed his sister's necklace: a metal coin hung from a piece of yarn. He brought the coin close to the styrofoam cup and observed that it was attracted to the cup as shown in the diagram below.
Which of the following statements best explains this observation?
Friction caused static to flow onto the cup; the static attracted the coin.
The cup is charged and attracts the coin which may or may not be charged.
The neutral coin was attracted to the oppositely-charged cup.
The coin and the cup must be oppositely charged.
Jeremy heard his Dad say that the balloon was "charged."
What does this really mean?
The number of (+) and (-) charges in the balloon are not equal.
The rubber balloon is now a conductor.
The balloon now has electrons that were created by friction.
Static flowed onto the balloon from the sweater.
What can you make visible by sprinkling iron filings around a magnet?
the areas called domains
the magnetic forces
the north and south poles
the magnetic field lines
A student created an electromagnet out of a piece of copper wire, a nail, and a battery, as shown.
The student observed that the electromagnet could not lift paper clips off a desktop as expected.
Which hypothesis will most likely help the student build an electromagnet capable of lifting paper clips?
Using a wooden stick instead of a nail will increase the number of paper clips that the electromagnet can pick up.
Adding more coils of copper wire to the nail will increase the number of paper clips that the electromagnet can pick up.
Pushing the coils of copper wire closer together will increase the number of paper clips that the electromagnet can pick up.
Using a battery that produces less electric current will increase the number of paper clips that the electromagnet can pick up.
The kinetic energy of an object depends on which of the following?
The mass of the object but not the speed of the object
The speed of the object but not the mass of the object.
Both the mass and the speed of the object.
The mass, speed and direction of travel of the object.
A man is driving a car. He slows down to stop at a stop sign.
When does the car have the most kinetic energy?
When the car's speed is 0 miles per hour.
When the car's speed is 30 miles per hour.
The car's kinetic energy is the same the whole time.
The car did not have kinetic energy as it did not hit anything.
What two variables can increase or decrease gravitational pull?
mass and direction
mass and distance
velocity and distance
size and velocity
The gravitational interaction is caused by ...
Earth’s magnetic field.
Earth’s rotation.
Earth’s atmosphere.
The interaction between two masses.
Based upon the scale chart of planet size, HOW MANY cm less is Mercury than Neptune is?
21. 4 cm
17.7 cm
7.4 cm
2.4 cm
What is wrong with this (and most) images of the solar system?
Pluto shouldn't be there
There are too many asteroids between Mars and Jupiter
The distances between planets are not to scale if the planetary size is to scale.
Mercury is way too close to the sun. It will burn up
These are position vs. time graphs for strings plucked on the harp at different points in a song, produced by a motion detector.
Out of the following graphs, which represents vibrations that are producing the highest pitch sound?
Graph A
Graph B
Graph C
Graph D
These are position vs. time graphs for strings plucked on the harp at different points in a song, produced by a motion detector.
Which graph represents vibrations that are producing the quietest sound?
Graph A
Graph B
Graph C
Graph D
These are position vs. time graphs for strings plucked on the harp at different points in a song, produced by a motion detector.
Which graph represents vibrations that are producing the loudest sound?
Graph A
Graph B
Graph C
Graph D
A sound wave cannot travel through which of the following?
Air
Water
Metal
vacuum (no matter)
Sound waves need a medium to travel through
TRUE
FALSE
What is the source of a sound wave?
Electricity
Vibration
Light Waves
Conduction
What is wave frequency
The length of time it takes for a wave to pass a certain point.
A measure of how fast a wave can travel.
The number of waves that pass a certain point in one second.
The distance from the peak of one wave to the peak of the next.
Genes are located on...
RNA
Chromosomes
Alleles
Traits
A mutation in the hemoglobin gene causes sickle-cell hemoglobin. People with sickle-cell hemoglobin are immune to malaria. If a population is exposed to malaria, how will the frequency of the mutated-sickle cell hemoglobin change over time?
The frequency will increase because people with sickle-cell hemoglobin will not die from malaria.
The frequency will decrease because all mutations are harmful, thus people with this mutation will die.
The frequency will decrease because people with the sickle cell hemoglobin will die because the protein no longer works.
The frequency will not change because people get one copy of each gene from mom and one from dad, thus the mutation will not have an affect.
A change in the DNA of a gene or chromosome is
mutation
allele
homozygous
trait
What is a goal of selective breeding?
I. To increase the value of species to humans.
II. To produce species that resist disease.
III. To produce species with specific traits.
I and II
II and III
I and III
I, II, and III
A student observed an example in which all of the offspring of an organism have the same genetic material, which is identical to the parent organism. Based on this the student can conclude that this organism?
makes its own food.
is unicellular.
reproduces asexually.
has a lot of genetic diversity.
Genetic engineering is manually adding new traits to an organism that are not already found in that organism.
TRUE
FALSE
What are different forms of genes inherited from each parent?
Alleles
Chromosomes
Recessive
Dominant
Which of the following is TRUE about the species that are living on earth today?
All species living today have existed since the time life began.
Most species living today have existed since the time life began, but a few have appeared more recently.
Most species living today did not exist at the time life began.
There is no way of finding out whether all, most, or only a few species living today existed since the time life began.
The bones in the human arm and whale flipper are similarly arranged, as shown in the diagram.
Which statement best explains the similarity in the arrangement of the bones in these two structures?
The bones of all animals are similarly arranged.
The bones of animals that take in oxygen are similarly arranged.
Humans and whales use these structures to perform the same functions.
Humans and whales inherited these structures from a common ancestor.
This diagram shows stages in the development of tortoise and chicken embryos.
Which observation of the tortoise and chicken embryos provides the strongest evidence of a close relationship not easily seen in their adult forms?
similar pattern of body development
similar length of time before hatching
similar length of tails in early development
similar number of limbs in late development
Suppose a population of rabbits is introduced to an environment that has hot summers and extremely cold winters. Every winter, many rabbits dies because of the cold and lack of food. The rabbits have a range of ear sizes (shown in the image below).
Rabbits lose a lot of their body heat through their ears. Every winter, more of the long-eared rabbits dies than the others. Every summer, more of the short-eared rabbits die than the others.
At first, there is an equal number of rabbits with each size of ears. After several years, what will the frequency of ear sizes in the population be like?
There will be an equal number of rabbits with each ear size.
There will be more rabbits with large ears than any others.
There will be fewer rabbits with large ears than any of the others.
There will be fewer rabbits with medium ears than any others.
The diagrams show the developing embryo and the adult form of several kinds of animals with backbones.
Which claim is best supported by comparing the development of these four animals with backbones?
The differences seen in the adult forms prove they lack a common ancestor.
The shape of each adult form is clearly seen in the earlier embryonic stages of its development.
The similarities seen in earlier embryonic stages provide strong evidence of a common ancestor.
The embryos of all animals with backbones share an identical pattern of development into adults.
The offspring of sexual reproduction
receives all of its genetic material from one parent
receives genetic material from an outside source
develops genetic material independent of any other source
receives half its genetic material from each parent
Earth orbits the Sun because there is a
gravitational pull from the Sun on the Earth. The Earth is pulled toward the Sun, rather than going off in a straight line.
gravitational pull from the Sun on the Earth. The Sun pulls the Earth in the direction of the Earth’s orbital path.
strong magnetic interaction between the Sun and the Earth. The gravitational interaction between the Sun and the Earth is small.
gravitational push from the Sun on the Earth. The Sun pushes the Earth away so it does not crash into the Sun.
What happens to the moon when it orbits Earth each month?
The moon gets larger.
The moon moves faster.
The moon changes shape.
The moon’s position changes and appears as phases.
In the diagram below, at which position in Earth’s orbit will a city in the Northern Hemisphere be experiencing spring?
Position D
Position A
Position C
Position B
