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OR - 2000-2001 - Science - Grade 8

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  • Some students are taking part in a community running race. Five minutes into the race, what happens in the students’ circulatory systems?

    The heart pumps more blood to the legs.
    The muscles start to tighten.
    Fluids pour into the stomach.
    The lungs need more air.


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  • Some students are taking part in a community running race. Ten minutes into the race, the students are perspiring or sweating. Which human body system is now involved?

    Nervous system
    Respiratory system
    Skeletal system
    Integumentary system


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  • Some students are taking part in a community running race. One of the students falls and sprains an ankle. A part of which system is now injured?

    Circulatory system
    Respiratory system
    Skeletal system
    Respiratory system


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  • Some students are taking part in a community running race. Several students get sunburned during the race. The skin is an organ in which human system?

    Circulatory system
    Integumentary system
    Skeletal system
    Respiratory system


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  • Alfredo and his friends rode their bikes on a bike path. The path was perfectly level, except where it went up over a small bridge and then came back down. There was no wind. The picture shows a side view of the shape of the path they followed. They had a contest to see who could coast the farthest. They pedaled as fast as they could from point 1 to point 2, and then they stopped pedaling and coasted to a stop at point 7. Of points 3, 4 and 5, at which point did their bikes travel fastest?

    3
    4
    5
    They went about the same speed at all three points.


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  • Alfredo and his friends rode their bikes on a bike path. The path was perfectly level, except where it went up over a small bridge and then came back down. There was no wind. The picture shows a side view of the shape of the path they followed. They had a contest to see who could coast the farthest. They pedaled as fast as they could from point 1 to point 2, and then they stopped pedaling and coasted to a stop at point 7. Which of the following would NOT have helped them coast farther?

    Crouching low over their bikes while coasting
    Swerving their bikes from side to side
    Pumping more air into their tires
    Oiling the wheel bearings


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  • Alfredo and his friends rode their bikes on a bike path. The path was perfectly level, except where it went up over a small bridge and then came back down. There was no wind. The picture shows a side view of the shape of the path they followed. They had a contest to see who could coast the farthest. They pedaled as fast as they could from point 1 to point 2, and then they stopped pedaling and coasted to a stop at point 7. They were going faster at point 5 than at point 4 because of what energy change?

    From chemical energy to mechanical energy
    From kinetic energy to heat
    From kinetic energy to mechanical energy
    From potential energy to kinetic energy


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  • Alfredo and his friends rode their bikes on a bike path. The path was perfectly level, except where it went up over a small bridge and then came back down. There was no wind. The picture shows a side view of the shape of the path they followed. They had a contest to see who could coast the farthest. They pedaled as fast as they could from point 1 to point 2, and then they stopped pedaling and coasted to a stop at point 7. Their bikes were accelerating between points

    1 and 2.
    2 and 3
    3 and 4.
    5 and 6.


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  • The Friends of Nature youth club has been studying a local greenbelt area for several years. The plants and land shapes in the area have changed very little, except that a very strong wind about a year ago blew down nearly all the large dead trees. Some of the other things the club has learned are shown in the table. The club has decided to investigate the population changes shown in the table. To explain the decline in the squirrel population, they should first investigate

    changes in the fox population.
    dwindling food supply.
    the increase in the duck population.
    loss of a safe nesting area.


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  • The Friends of Nature youth club has been studying a local greenbelt area for several years. The plants and land shapes in the area have changed very little, except that a very strong wind about a year ago blew down nearly all the large dead trees. Some of the other things the club has learned are shown in the table. The club has decided to investigate the population changes shown in the table. The club could well predict that the change in the duck population might be due to reduction in

    habitat.
    number of squirrels.
    trees.
    predators.


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  • Shown are two pictures of the same mountain. Use the pictures to answer the question. These pictures show a mountain at two different points in time. About how long did it probably take the mountain to change from “Before” to “After”?

    Less than a year
    About ten thousand years
    About a million years
    Over a billion years


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  • Shown are two pictures of the same mountain. Use the pictures to answer the question. Changes like those in the pictured mountain are most likely to occur in states near the

    Atlantic Ocean.
    Great Lakes.
    Gulf of Mexico.
    Pacific Ocean.


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  • Shown are two pictures of the same mountain. Use the pictures to answer the question. Scientists observing the changes shown in the pictures would probably learn the most by using which of the following instruments?

    Anemometer
    Barometer
    Seismograph
    Thermometer


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  • The force that makes it hard for you to swim through water is

    drag.
    thrust.
    lift.
    gravity.


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  • A small ball is dropped down one end of a pipe. When air is blown in from the opposite end, the ball stops in the pipe. Which is a probable explanation?

    The pipe fills with air which will keep anything from falling through it
    Gravity’s pull is less inside the pipe than outside the pipe.
    The ball is made of very lightweight plastic.
    The force of the air on the ball balances the pull of gravity.


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  • You want to measure the volume of a rock. The best way to do this is with

    a ruler, water and a balance.
    a beaker and water.
    a beaker, a hot plate and water.
    a beaker, a graduated cylinder and water.


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  • The migration of Canadian geese heading south may be observed between December 15 and January 5 in Forest Grove every year. This is an example of

    a cyclic phenomenon.
    molting.
    random behavior.
    coincidence.


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  • Look at this diagram. Each circle shows one state of matter. The arrows show ways that matter might change state. For example, arrow 2 shows that matter can change from a liquid to a gas. A pan of water boiling on a stove would match arrow 2. Heating a substance almost never causes the change shown by arrow

    1
    2
    3
    4


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  • Which energy change is usually made directly?

    Sound to light
    Mechanical to nuclear
    Light to heat
    Sound to electrical


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