Free GED SCIENCE Exam Braindumps (page: 1)

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Many scientists believe that early in Earth's history, life began in water, aided by the energy from sunlight. Dissolved molecules probably bonded chemically with each other to produce increasingly complex organic molecules called "heterotroph aggregates." These molecules eventually developed the ability to reproduce.
Why are heterotroph aggregates not found on Earth's Moon?

  1. The effect of Earth's gravity on the Moon is too weak.
  2. The Moon is composed of elements not found on Earth.
  3. There is no energy from sunlight on the Moon.
  4. There is no liquid water on the Moon.
  5. The Moon is composed of inorganic molecules.

Answer(s): D



A steel ball fits exactly into a hole in a wooden block. If the steel ball is heated, which of the following will occur?

  1. The ball will be too large to fit in the hole.
  2. The ball will become oval shaped.
  3. The ball will shrink and be loose in the hole.
  4. The ball will crack into two equal parts.
  5. The ball will still fit exactly into the hole.

Answer(s): A



Pressure is explained as the force (a push or a pull) applied on a surface, divided by the total area over which the force is applied. For example, more pressure is exerted under Abby's heel wearing spiked heel shoes than under Abby's heel wearing flat heeled shoes.
In figure A, the man is walking in snow with snowshoes and does not sink into the deep snow. In figure B, the man has no snowshoes on and immediately sinks into the deep snow.


What would cause the man in figure A to sink less deeply into the snow than the man in figure B?

  1. The man in figure B is much heavier than the man in figure
  2. The man in figure A is much heavier than the man in figure
  3. The man in figure A has his weight spread out over the area covered by the snowshoe, which lessens the pressure.
  4. The man in figure B has his weight spread out over the small area covered by his running shoes, which lessens the pressure.
  5. The man in figure A has his weight spread out over the area covered by the snowshoe, which increases the pressure.

Answer(s): C



Air is a mixture of gases, mostly nitrogen and oxygen, but it also contains a small amount of water vapor. Depending on its temperature, water can exist in any of the three states of matter.
In the diagram at the left, water droplets have formed on the outside of the can, and the can contains pieces of ice.


Based on the information and diagram, which statement regarding the droplets on the outside of the can is the most accurate?

  1. The can leaked water from the ice cubes as they melted.
  2. The ice in the can cooled the air around the can, causing the water droplet formation.
  3. Liquid on the can is CO2 from the exhaled air of the observers of the demonstration.
  4. Many more droplets would have appeared if a styrofoam cup had been substituted for the tin can.
  5. Many more droplets will form on the outside of the can on a windy day, when the air is less humid.

Answer(s): B



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