Free GED SCIENCE Exam Braindumps (page: 18)

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A polar bear's furry coat protects the bear from the frigid air temperature. Similarly, a covering of ice floating on a pond of water protects the fish that inhabit the pond.
Why does water remain in a liquid state below the surface of ice?

  1. Water is less dense than ice, so it settles to the bottom.
  2. Ice weighs more, so it is heavier than water.
  3. The layer of ice acts as insulation, keeping the water from freezing.
  4. The layer of ice protects the water from the Sun.
  5. Ice contains atoms different from those in water.

Answer(s): C



Making products from recycled materials, such as aluminum cans, glass, and plastic usually saves energy and other resources. For example, it takes about 75% less energy to make steel from scrap than from ore. All forms of recycling involve some energy to produce the recycled materials, a process that also results in the production of some pollution.

The chart at the left shows the energy savings from recycling.
When Anil is at the grocery store, he can choose to buy juice in a glass bottle, an aluminum can, a plastic jug, a juice box (paper), or foil-covered juice container.
If Anil's community requires that he recycles, which container would provide the MOST overall energy savings?

  1. aluminum can
  2. plastic jug
  3. waxy, cardboard juice box
  4. glass bottle
  5. foil-covered container

Answer(s): A



When choosing an organism to study, geneticists prefer the following characteristics. The organism should be small, have a fast growth rate, and have the ability to produce many offspring.
Based on these criteria, which plant would be LEAST useful for a genetic study?

  1. moss
  2. grass plant
  3. dandelion
  4. oak tree
  5. tomato plant

Answer(s): D



According to the bar graph, in 1997, the use of which energy source(s) most closely paralleled the use of coal?

  1. hydroelectric
  2. nuclear
  3. oil
  4. natural gas
  5. coal and oil

Answer(s): D






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