GED-Science 試験問題を無料オンラインアクセス

Cholera is a disease caused by a bacterium that is transmitted by water, shellfish, and raw vegetables. The major symptom is severe diarrhea. Epidemics of cholera in the Americas, common in the 19th century, are much less frequent now with the advent of modern medicine and improved methods of hygiene.
However, in 1991, the number of cholera epidemics increased again in one South American country, causing over 4000 deaths.
The high number of cases of cholera in the South American country noted above was most probably due to which factor?

• A.lack of variety in foods
• B.widespread overuse of antibiotics
• C.poor water and sewage treatment
• D.eating the wrong kinds of foods
• E.prolonged smoking of cigarettes

A family wants to plant a garden, but the soil around the house is mainly clay. Clay soil easily becomes saturated with water, cutting off the air supply needed by plants. Adding sand and peat moss can help plants grow in clay soil.
Which is the procedure for preparing the clay soil for planting?

• A.Plant only in sand or peat moss.
• B.Wait until midsummer before trying to plow or spade the soil.
• C.Mix sand and peat moss with the soil while it is fairly dry.
• D.Wet the soil thoroughly for a week before trying to plow or spade it.
• E.Dig deep holes and keep them filled with water for several weeks.

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Nancy and Sophia are studying weather in science class. Nancy tells Sophia that warm air ismore dense than cold air.
Which of the following statements proves that Nancy's belief is false?

• A.Precipitation forms where cold and warm air masses meet.
• B.A warm air mass cannot form clouds.
• C.A cold air mass can push a warm air mass upward.
• D.Cool, dry air can move around warm, moist air.
• E.Cold, dry air pushes clouds past a front.

The battery of an automobile produces electricity from a chemical reaction. This electricity leaves the battery from a post called a terminal and is used in starting the engine. Sometimes a crusty deposit forms on the terminals, preventing the engine from starting. Simply cleaning off the deposit often restores the battery to operable condition.

Which effect does the deposit have on the battery terminals?

• A.improves spark plug firing
• B.causes hazardous sparks
• C.is caused by hard water
• D.does not conduct electricity
• E.conducts electricity

Temperature is a measure of the average kinetic energy (motion) of individual particles in a substance. Thermal energy is the total combined energy of all the particles. When
comparing samples of the same substance, the total thermal energy of the sample depends on its temperature and mass.
Cheryl fills five containers with different amounts of the same substance as shown in the diagram below. The contents of all five containers are kept at the same 50(degrees) Celsius temperature.

To remain buoyant, an object must displace a mass of liquid equal to its own mass. Shown below are five identical corks each placed in small vials, containing equal volumes of liquids that have different salt concentrations. The solution with the highest concentration of salt will have the highest mass and will require the least displacement of liquid.

Based on the information and diagram, which vial has the greatest concentration of salt?

• A.A
• B.E
• C.B
• D.C
• E.D