| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.07 |
| Score | 0% | 61% |
Which of the following is the primary difference between a comet and an asteroid?
comets orbit the Sun |
|
asteroids have a coma |
|
asteroids contain frozen water |
|
comets have an atmosphere |
A comet is a loose collection of ice, dust, and small rocky particles that, in contrast to an asteroid, has an extended atmosphere surrounding the center. When passing close to the Sun, this atmosphere warms and begins to release gases forming a visible coma or tail.
Which of the following states of matter exists at the highest temperature?
solid |
|
liquid |
|
gas |
|
none of these |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
Which of the following does not represent the freezing point of water?
0°C |
|
32°F |
|
273K |
|
0°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.
A subatomic particle found in the nucleus of an atom. It carries a positive electric charge. This desribes which of the following?
electron |
|
neutron |
|
atom |
|
proton |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
Which of these digestive enzymes is not produced by the pancreas?
lipase |
|
trypsin |
|
pancreatic amylase |
|
gastric acid |
The acids produced by the pancreas contain several enzymes that aid in digestion. Lipase converts fat to glycerol and fatty acids. Pancreatic amylase breaks down complex carbohydrates into simple sugars. Trypsin converts polypeptides (the building blocks of protein) into amino acids.