GED-Science 試験問題を無料オンラインアクセス

Every radioactive element has a specific half-life, which is the amount of time it takes one-half of a sample to decay. The following graph shows the radioactive decay of 2000 grams
(g) of Iodine-131. Iodine-131 has a half-life of about 8 days. So after 8 days, one half of the original sample, or 1000 g, of Iodine-131 remains.

Using the graph on the left, how much of the original 2000 g of Iodine-131 will remain after it has undergone radioactive decay for 16 days?

• A.250 g
• B.1000 g
• C.500 g
• D.2000 g
• E.125 g

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According to the map, what do the states of Minnesota, Louisiana, Colorado, and Delaware have in common?

• A.They have minor damage risk from earthquakes.
• B.They have the same weather.
• C.Their geography is similar.
• D.They have regions of major damage risk from earthquakes.
• E.Their major cities are in regions of no damage risk from earthquakes.

Exhibit:
Which title best describes the diagram?

• A.The Sun and the Four Larger Planets
• B.The Sun, Stars, and the Asteroids
• C.The Sun and the Five Smaller Planets
• D.The Sun, Moon, and Stars
• E.The Sun and the Nine Planets

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The pH scale has a range of 0-14. A pH of 7 is the neutral point. The acid range is less than 7. The basic range is greater than 7. Indicators are chemicals that in a solution change color to indicate an approximate pH. The indicator litmus is red in the acid range and blue in the basic range. The diagram below shows the pH scale and the pH values of several common substances.
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The pH scale has a range of 0-14. A pH of 7 is the neutral point. The acid range is less than 7. The basic range is greater than 7. Indicators are chemicals that in a solution change color to indicate an approximate pH. The indicator litmus is red in the acid range and blue in the basic range. The diagram below shows the pH scale and the pH values of several common substances.

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Based on the information and the diagram, which substance would cause the indicator litmus to be a blue color?

• A.apple juice
• B.tomato juice
• C.vinegar
• D.ammonia
• E.milk

As pressure in a closed container is increased, the volume, or amount of space that a gas takes up, decreases. Divers who work underwater use tanks containing oxygen in order to breathe. The amount of oxygen in the tanks allows the divers to stay underwater for some time, yet the tanks are not huge.
Which statement best explains this occurrence?

• A.Since the oxygen is under pressure, a large amount of oxygen can be placed in these small tanks.
• B.Oxygen takes up only a small amount of the air that we breathe.
• C.Most divers don't stay underwater for a very long time because they get very cold quickly.
• D.Oxygen has to be in small metal tanks so that divers don't sink.
• E.If the tanks are small, the fish will not be frightened by the divers.