| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.97 |
| Score | 0% | 59% |
Which of the following does not represent the freezing point of water?
0°F |
|
0°C |
|
273K |
|
32°F |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.
In cell biology, what part of the cell contains organelles?
nucleus |
|
cell membrane |
|
cell wall |
|
cytoplasm |
The nucleus of a eukaryotic cell contains the genetic material of the cell and is surrounded by cytoplasm which contains many organelles.
The asteroids in the Kuiper belt are composed of which of the following?
rock |
|
frozen methane, ammonia, and water |
|
gaseous methane, ammonia, and water |
|
minerals |
The Kuiper Belt is similar to the asteroid belt but much larger. Extending beyond the orbit of Neptune, it contains objects composed mostly of frozen methane, ammonia, and water. Most notably, the Kuiper Belt is home to Pluto, a dwarf planet that, until a 2006 reclassification, was considered the ninth planet of the solar system.
Which is the proper order of Earth's atmospheric layers from the surface up to space?
thermosphere, mesosphere, stratosphere, troposphere |
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stratosphere, troposphere, mesosphere, thermosphere |
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mesosphere, thermosphere, stratosphere, troposphere |
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troposphere, stratosphere, mesosphere, thermosphere |
The troposphere is the closest layer to Earth, followed by the stratosphere, mesosphere, and finally the thermosphere which borders space.
A subatomic particle that orbits the nucleus of an atom. It carries a negative electric charge. This desribes which of the following?
proton |
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isotope |
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neutron |
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electron |
An electron is a subatomic particle that orbits the nucleus of an atom. It carries a negative electric charge. Generally, an atom has the same number of negative electrons orbiting the nucleus as it does positive protons inside.