Worksheets8th Science Review
Total questions: 20
Worksheet time: 26mins
What step should the students take next in the investigation to increase the strength of the motor?
Reduce the size of the axle running through the center of the motor.
Increase the number of coils of wire within the two sections of the motor.
Decrease the voltage of the power source being used to operate the motor.
Place the permanent magnets and coils of wire farther apart inside the motor.
Which pair of statements is a valid description and explanation of the motion of the ball based on evidence from the diagram?
description: The ball slows down as it moves to the right because the horizontal forces are unbalanced, with the larger force acting to the left.
explanation: The ball speeds up as it moves downward because the vertical forces are unbalanced, with the larger force acting downward.
description: The ball speeds up as it moves to the right because the horizontal forces are unbalanced, with the larger force acting to the right.
explanation: The ball speeds up as it moves downward because the vertical forces are unbalanced, with the larger force acting downward.
description: The ball moves at a constant speed to the right because the horizontal forces are unbalanced, with the larger force acting to the left.
explanation: The ball slows down as it moves downward because the vertical forces are unbalanced, with the larger force acting upward.
description: The ball slows down as it moves to the right because the horizontal forces are unbalanced, with the larger force acting to the right.
explanation: The ball moves at a constant speed downward because the vertical forces are unbalanced, with the larger force acting upward.
Which statement is the BEST analysis of the data for the runner?
The runner covers the first 80 m running at a constant speed and then slows down, reaching a minimum speed during the final 20 m.
The runner starts slower and speeds up, reaching a constant speed between 20 and 80 m, and then speeds up again during the final 20 m.
The runner covers the first 70 m running at a constant speed and then speeds up, reaching a maximum speed during the final 30 m.
The runner starts slower and speeds up, reaching a maximum speed between 50 and 70 m, and then slows down during the final 30 m.
Which statement is an accurate analysis of the vertical motion of the shot?
The direction of the velocity is upward for both the first second and the last second, and the acceleration remains constant for the entire period.
The direction of the velocity is downward for both the first second and the last second, and the acceleration decreases during the entire period.
The direction of the velocity is upward for the first second and then downward for the last second, and the acceleration decreases during the entire period.
The direction of the velocity is upward for the first second and then downward for the last second, and the acceleration remains constant for the entire period.
A student reads that a number of electrical devices utilize electromagnets. Some of these devices require strong magnetic fields. The student decides to investigate how to increase the strength of a basic electromagnet.
How can the student test whether the magnetic field produced by an electromagnet is increasing in strength?
A stronger magnet will require less wire for the coils.
A stronger magnet will have more widely spaced coils.
A stronger magnet will have a reduced measurable current.
A stronger magnet will attract a greater number of metallic items.
How would the model be different for a sound wave that is being transmitted through the same substance?
The wavy arrows representing sound waves would have a smaller wavelength.
The wavy arrows representing sound waves would go in the opposite direction.
The atoms in the model would move parallel to the direction of the incoming wave.
The atoms in the model would move perpendicular to the direction of the incoming wave.
Which explanation correctly uses the data in the diagram to show how infrared radiation and ultraviolet radiation are related in terms of energy?
Ultraviolet radiation has less energy than infrared radiation because energy is inversely proportional to frequency and the frequency of ultraviolet radiation is higher.
Ultraviolet radiation has more energy than infrared radiation because energy is inversely proportional to frequency and the frequency of ultraviolet radiation is lower.
Ultraviolet radiation has less energy than infrared radiation because energy is proportional to frequency and the frequency of ultraviolet radiation is lower.
Ultraviolet radiation has more energy than infrared radiation because energy is proportional to frequency and the frequency of ultraviolet radiation is higher.
What wave behavior does the image model?
(a)
Which model shows the wave behavior of an echo?
When white light enter through a prism, its path is changed because the light is _________________ at the boundary between the glass and the air.
absorbed
diffracted
reflected
refracted
Different colors are seen because each color of light that emerges from the prism has a different
amplitude
energy
speed
wavelength
Based on the information in the graph, which statement describes the motion of the two toy cars?
Car 1 is traveling faster than car 2.
Car 2 is traveling farther than car 1.
Car 1 has constant velocity between 0 and 10 seconds.
Car 2 is changing direction between 10 and 15 seconds.
The group claims that the amount of force needed to accelerate a toy block is directly proportional to its inertia.
Which explanation presents the BEST argument for whether the group’s claim is true?
The claim is false because every time the mass of the metal cube is increased, the pointer on the spring scale moves downward.
The claim is true because every time the mass of the metal cube is doubled, the gravitational force doubles.
The claim is false because every time the volume of the metal cube is increased, the pointer on the spring scale moves downward.
The claim is true because every time the volume of the metal cube is doubled, the gravitational force doubles.
Which statement is TRUE based on the graph?
Segment BC and segment EF show constant speed.
Segment OA and segment BC show constant speed.
Segment AB and segment CD show positive acceleration.
Segment OA and segment DE show positive acceleration.
Why are scientists warning that exclusively growing this mutant type by asexual reproduction presents a serious disadvantage?
The loss of an adequate Cavendish banana seed supply could result in extinction of this variety.
The changes in characteristics from a parent plant to a clone will produce inconsistent plants that are less healthy.
The lack of genetic variability among clones puts the whole species at increased risk of extinction through a catastrophic disease or pest.
The increasing number of homologous sets of chromosomes with each successive generation of clones will eventually result in widespread death of banana plants.
Growers on large banana farms that supply food commercially have chosen to limit their plantings exclusively to Cavendish banana plants. What advantage is likely cited by the growers for continued planting of these asexually produced crops year after year?
Seedless cloned plants are not damaged by disease and pest organisms.
Successive generations of clones produce larger bananas and healthier plants.
The cloned banana plants rapidly adapt to extreme environmental changes due to their limited genetic variation.
The bananas produced maintain consistent characteristics in quality, taste, and appearance from one crop of clones to the next
Which question can be studied by using a drone to observe recent changes in Earth’s surface along coastal areas?
How fast are the cliffs eroding?
How many people live near cliffs
How old are rock layers at the bottom of the cliff?
How can people stop the erosion of cliffs near the coast?
[ART A: Based on the picture, which steps would produce the BEST model of how the Himalayas formed over time?
step 1: Label one cardboard box as the Eurasian Plate.
step 2: Label another cardboard box as the Indian Plate.
step 3: Slowly push both plates toward each other.
step 4: Observe and record how the sizes of both plates change when the edges push against each other
step 1: Label one cardboard box as the Eurasian Plate.
step 2: Label another cardboard box as the Indian Plate.
step 3: Slowly push the Indian Plate toward the Eurasian Plate.
step 4: Observe and record how the size of the Indian Plate changes when it touches the edge of the Eurasian Plate.
step 1: Use light-colored clay to make the shape of the Eurasian Plate.
step 2: Use dark-colored clay to make the shape of the Indian Plate.
step 3: Slowly push the dark-colored plate toward the light-colored plate.
step 4: Observe and record how the shapes of both plates change when the edges push against each other.
step 1: Use light-colored clay to make the shape of the Eurasian Plate.
step 2: Use dark-colored clay to make the shape of the Indian Plate.
step 3: Slowly push the light-colored plate toward the dark-colored plate.
step 4: Observe and record how the shape of the Eurasian Plate changes when it touches the edge of the Indian Plate.
PART B: Which data could the student collect using the BEST model from part A?
the changing distance between the two plates
the time it takes for the two plates to collide
the mass of the materials used to make the two plates
the changing height of the edge where the two plates collide
Based on the evidence, which TWO arguments correctly match a magnet to its best use?
Magnet 1 should be used to pick up many small magnetic objects at once because the temporary magnet can pick up as many objects as the permanent magnet can.
Magnet 1 should be used to pick up magnetic objects in one location and dropping them off in another location because temporary magnets can be turned on and off.
Magnet 1 can be used in all the ways magnet 2 is used because temporary magnets can be made stronger or weaker and permanent magnets cannot.
Magnet 2 should be used to pick up magnetic objects in places where there is no power supply because permanent magnets do not run out of energy.
Magnet 2 should be used to pick up large magnetic objects because permanent magnets are stronger than temporary magnets.
