| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
Water freezing or boiling is an example of which of the following?
sublimation |
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cooling |
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phase transition |
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heating |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
The pitch of the siren of an approaching ambulance changes as it approaches you. This is an example of which of the following?
reflection |
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refraction |
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sound radiation |
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Doppler effect |
The Doppler effect occurs when the source or listener (or both) of sound waves is moving. If they're moving closer together, the listener perceives the sound with a higher pitch and, when they're moving apart, the listener perceives the sound with a lower pitch.
These clouds grow upward and can develop into cumulonimbus or thunderstorm clouds.
cirrus clouds |
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cumulus clouds |
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stratus clouds |
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nimbus clouds |
Cumulus clouds are large, puffy, mid-altitude clouds with a flat base and a rounded top. These clouds grow upward and can develop into a cumulonimbus or thunderstorm cloud.
The connective tissue that connects bones to other bones at joints is called:
tendons |
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knuckles |
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ligaments |
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cartilage |
Tough fibrous cords of connective tissue called tendons connect muscles to the skeleton while another type of connective tissue called ligaments connect bones to other bones at joints (elbow, knee, fingers, spinal column).
Which of the following does not filter air as part of the respiratory system?
nasal cavity |
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trachea |
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epiglottis |
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pharynx |
After air enters through the nose, it passes through the nasal cavity which filters, moistens, and warms it. Further filtering takes place in the pharynx, which also helps protect against infection, and then in the trachea which is just past the epiglottis which prevents food from entering the airway.