Online Access Free GED-Science Practice Test

The table at the left lists the thermal conductivity of several common substances.The lower the thermal conductivity of a substance, the slower the transfer of energy as heat.

Equal amounts of hot soup at the same temperature are placed in identical, closed containers made of the materials listed below.
Based on the information and chart, which container would keep the soup warm longer?

• A.copper
• B.brass
• C.steel
• D.glass
• E.zinc

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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.

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What appears to be the difference in the waves when moving from radio waves to X rays in the electromagnetic spectrum?

• A.decreased frequency
• B.decreased wavelength
• C.decreased energy
• D.increased wavelength and frequency
• E.increased wavelength and energy

The left side of the brain dominates in verbal skills, reading, writing, and logical thinking. The right side of the brain is adept at space and pattern perception. While the right side does not express speech, the right side dominates in visual imagery and spatial relationships.
The left side of the brain would dominate in which of the following activities?

• A.recognizing a song on the radio
• B.using depth perception to park a car
• C.having a conversation on the telephone
• D.looking at a picture in a museum
• E.recognizing a person's face

Earth's atmosphere contains naturally-occurring ozone. Ozone, which contains three oxygen atoms joined together (O3), forms a layer miles above Earth's surface. The layer serves as a shield from the harmful ultraviolet rays of the Sun.
A group of chemicals called CFCs (chlorofluorocarbons) are used as refrigerants, propellants, and cleaning solvents. At Earth's surface CFCs are chemically stable. However, CFC molecules can be broken apart high in the atmosphere and they can destroy the protective ozone layer.
Based on the information, which action would reduce the destruction of the ozone layer?

• A.Plant more oxygen-producing trees.
• B.Build many ozone-producing plants.
• C.Use ultraviolet sunscreen more frequently.
• D.Limit the production and use of CFCs.
• E.Research ways to convert more ozone into oxygen.

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?

• A.sugar
• B.starch
• C.water
• D.yeast
• E.carbon dioxide