GED Section 3: Science SECTION 3: SCIENCE Dumps in PDF

Free GED SECTION 3: SCIENCE Real Questions (page: 8)

Making bread involves a chemical reaction. A chemical reaction involves starting materials (the reactants) and the substances produced (the products).
Which material is a product of this chemical reaction?

  1. yeast
  2. sugar
  3. carbon dioxide
  4. water
  5. starch

Answer(s): C



Adults generally breathe in and out 12 to 20 times per minute. People sitting down breathe more slowly than those standing up. The older adults become, the more slowly they breathe. Children breathe twice as fast as adults. Women generally breathe faster than men.
Which of the following persons would most likely breathe the slowest?

  1. a 10-year-old girl standing up
  2. a 15-year-old boy sitting down
  3. a 15-year-old girl sitting down
  4. a 50-year-old man sitting down
  5. a 50-year-old woman standing up

Answer(s): D



When single cells reproduce, 1 cell produces 2 cells. These 2 cells produce 4 cells. These 4 cells produce 8 cells, and so on. This growth results in an increase in the number of cells.
Which assumption must be made to understand why the cell number increases in this way?

  1. The number of cells is no more than 8.
  2. Cells must be observed under the microscope.
  3. The cells are too small to see with the naked eye.
  4. All the cells formed can divide.
  5. Mutations are occurring as the cells reproduce.

Answer(s): D



DDT is a toxic substance. The illustration below lists DDT levels in various organisms.
Which statement best explains why the amount of DDT is higher in the eagle than in the otherorganisms?
Exhibit:

  1. DDT is more poisonous to birds than to other living organisms.
  2. The DDT in the small bird passes directly to the eagle.
  3. The eagle has a diet of animals and plants.
  4. DDT becomes more concentrated as it passes through the food web.
  5. Mice are the only animals on which the eagles feed.

Answer(s): D



-- Exhibit --
Radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X rays, and gamma rays are forms of radiant energy that make up the electromagnetic spectrum. Each portion of the electromagnetic spectrum has waves that vary in frequency and wavelength, but all can be used by people. Radio waves can be used to carry music and voices for great distances through air, X rays can be used for diagnostic work in medicine, and infrared radiation can be used for heating and drying.

-- Exhibit --
Most genetic damage is caused by very short wavelengths of the electromagnetic spectrum.
Which of the following statements would support this statement?

  1. Gamma rays penetrate very deeply and are highly energetic.
  2. Ultraviolet rays are stopped by the skin.
  3. Short wavelengths may be photographed.
  4. Infrared light is used in night photography.
  5. Microwaves may be used to carry telephone conversations.

Answer(s): A



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