Text: A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. It is also a valve used in air brake systems on heavy trucks.

Question: is a double check valve the same as a backflow preventer?

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Answer: no

Text: The great white shark has no known natural predators other than, on very rare occasions, the killer whale. The great white shark is arguably the world's largest known extant macropredatory fish, and is one of the primary predators of marine mammals. It is also known to prey upon a variety of other marine animals, including fish and seabirds. It is the only known surviving species of its genus Carcharodon, and is ranked first in having the most recorded shark bite incidents on humans.

Question: do great white sharks have any natural predators?

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- no
- yes
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Answer: no

Text: Condensation is the change of the physical state of matter from gas phase into liquid phase, and is the reverse of vapourisation. The word most often refers to the water cycle. It can also be defined as the change in the state of water vapour to liquid water when in contact with a liquid or solid surface or cloud condensation nuclei within the atmosphere. When the transition happens from the gaseous phase into the solid phase directly, the change is called deposition.

Question: is condensation of water vapor a physical change?

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Answer: yes

Text: It is often believed that eating cooking apples raw will make a person sick. In reality cooking apples are harmless raw and are just varieties of apples whose characteristics are well suited to cooking. This myth is simply a product of cooking apples' tart taste and the possibility of it not sitting well in the stomach.

Question: is it ok to eat cooking apples raw?

OPTIONS:
- no
- yes
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Answer:
yes