| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.21 |
| Score | 0% | 64% |
Which of the following states of matter exists at the lowest temperature?
liquid |
|
solid |
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gas |
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none of these |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
A subatomic particle found in the nucleus of an atom. It carries a positive electric charge. This desribes which of the following?
atom |
|
neutron |
|
proton |
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electron |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
Cellular fermentation takes place:
anaerobically |
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aerobically |
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in the presence of oxygen |
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in plant cells |
If no oxygen is present, cellular respiration is anaerobic and will result in fermentation where either lactic acid or alcohol is used instead of oxygen.
Earth's history is divided into time periods, which of these is the shortest time period?
epoch |
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eon |
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age |
|
period |
The Earth is approximately 4.6 billion years old and its history is divided into time periods based on the events that took place and the forms of life that were dominant during those periods. The largest graduation of time is the eon and each eon is subdivided into eras, eras into periods, periods into epochs, and epochs into ages.
Which of the following would be used in eye glasses to correct farsightedness?
convex mirror |
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convex lens |
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concave mirror |
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concave lens |
Unlike curved mirrors that operate on the principle of reflection, lenses utilize refraction. A convex lens is thicker in the middle than on the edges and converges light while a concave lens is thicker on the edges than in the middle and diffuses light. A common use for curved lenses is in eye glasses where a convex lens is used to correct farsightedness and a concave lens is used to correct nearsightedness.