Plutonium is
A. radioactive.
B. chemically toxic to humans.
C. fissionable.
D. All of the choices are correct.
Answer: D
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Germanium, Ge (number 32), computer chips operate faster than silicon, Si (number 14), computer chips. So how might a gallium, Ga (number 31), chip compare with a germanium chip?
A. Gallium is located just below aluminum, which is widely known to be an electrical insulator. B. A gallium chip would be even faster because the gallium is more metallic. C. Gallium is more nonmetallic and so it does not conduct electrons very well. D. A gallium chip would be slower because its electrons are more loosely held.
Methane, nitrous oxide, and halocarbons
A) are not as potent as carbon dioxide and water vapor. B) exert a negative radiative forcing effect in the atmosphere. C) are all potent greenhouse gases but at present are less of a threat for climate change than carbon dioxide. D) are removed from the atmosphere as fast as they enter and pose no threat of climate change.
What is the name of the rock in the above image?
A) Breccia B) Limestone C) Shale D) Coquina
Which of the following is TRUE when the soil is at field capacity?
A) The soil is holding the maximum amount of water that it can hold against the pull of gravity. B) A surplus definitely exists. C) No gravity drainage has occurred. D) The capillary force is not acting.