Practice Quiz

NAEP Science Grade 8 - Question List

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11. If you breathe on a mirror, part of the mirror clouds up. What are you actually seeing when you see the mirror cloud up?
  1. Water droplets that formed from cooled water vapor in your breath
  2. Carbon dioxide that you are breathing out from your lungs
  3. Oxygen that you are breathing out from your lungs
  4. Cooled nitrogen in the air around you
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12. Which is an example of water condensing?
  1. A puddle disappearing on a hot summer afternoon
  2. Sweat forming on your forehead after you do a lot of exercise
  3. Ice cubes melting when you put them out in the sun
  4. Dew forming on plants during a cold night
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13. All of the following would be helpful in separating a mixture of sand and salt EXCEPT
  1. a magnet
  2. a glass cup
  3. a filter paper and funnel
  4. water
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14. The Earth's Moon is
  1. always much closer to the Sun than it is to the Earth
  2. always much closer to the Earth than it is to the Sun
  3. about the same distance from the Sun as it is from the Earth
  4. sometimes closer to the Sun than it is to the Earth and sometimes closer to the Earth than it is to the Sun
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15. To keep a heavy box sliding across a carpeted floor at constant speed, a person must continually exert a force on the box. This force is used primarily to overcome which of the following forces?
  1. Air resistance
  2. The weight of the box
  3. The frictional force exerted by the floor on the box
  4. The gravitational force exerted by the Earth on the box
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