| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.59 |
| Score | 0% | 72% |
A major difference between sound waves and light waves is which of the following?
a sound wave cannot travel through a vacuum |
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a sound wave is much slower than a light wave |
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all of these are correct |
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a sound wave is mechanical while a light wave is electromagnetic |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.
Carbohydrates are found in:
vegetable oils |
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food additives |
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animal sources |
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sugars and starches |
Carbohydrates are major sources of energy for the body and are found in sugars (fruit, cane sugar, beets) and starches (bread, rice, potatoes, pasta).
Poor balance could indicate an issue with which part of the nervous system?
cerebrum |
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spinal cord |
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cerebellum |
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medulla |
The cerebellum is a large cluster of nerves at the base of the brain that's responsible for balance, movement, and muscle coordination.
Veins __________ blood at __________ pressure.
deoxygenated, low |
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oxygenated, low |
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deoxygenated, high |
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oxygenated, high |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.
Which of the following states of matter exists at the lowest temperature?
solid |
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gas |
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liquid |
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none of these |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.