| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.97 |
| Score | 0% | 59% |
A subatomic particle found in the nucleus of an atom. It carries no electric charge. This desribes which of the following?
neutron |
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electron |
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atom |
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proton |
A neutron is a subatomic particle found in the nucleus of an atom. It is neutral as it carries no electric charge.
What kind of weather front is likely to create clouds and storms?
warm front |
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cold front |
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temperate front |
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stationary front |
A warm front is the boundary between warm and cool (or cold) air when the warm air is replacing the cold air. Warm air at the surface pushes above the cool air mass creating clouds and storms.
The hottest of Earth's atmospheric layers is which of the following?
troposphere |
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mesosphere |
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stratosphere |
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thermosphere |
Temperatures again increase with altitude in the thermosphere which is the hottest (4,530 °F / 2,500 °C) atmospheric layer due to direct exposure to the Sun's radiation. However, the gas in this layer is highly diluted so even though the atoms of gas may be very high in temperature, there are too few of them to effectively transfer much heat.
Which of the following temperatures is least like the others?
32°F |
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0K |
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-273°C |
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absolute zero |
Absolute zero is the coldest possible temperature in the universe. In the Kelvin scale, absolute zero is 0K and in the Celsius scale it is -273°C.
Which of the following would be found on a reflecting telescope?
convex mirror |
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concave lens |
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convex lens |
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concave mirror |
A concave (or converging) mirror bulges inward and focuses reflected light on the mirror's focal point where the mirror's angles of incidence converge. In contrast, a convex (or diverging) mirror bulges outward and diffuses the light waves that strike it. A common use of a concave mirror is in a reflecting telescope, a common use of a convex mirror is in the side view mirror of a car.