I just took a test in school today. What question was I asked?

Question I was asked: Which of the following devices relies on electromagnetic radiation in the radio wave region of the spectrum for operation?

Random question?

Where is most of Earth's water located?

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Question generated: Which statement best describes the energy transformations that occur when a candle burns?

Problem: Write a question you would see in a school textbook.

Answer: What structure surrounds the cell and regulates materials that enter and leave the cell?

question: Write a question you would see in a school textbook. OPTIONS:
- discovering new reservoirs of water in the aquifer
- reducing water usage through conservation measures
- combining hydrogen with oxygen to make water
- piping in water from an aquifer elsewhere
answer: As the population in an area grows, water usage increases. Eventually, water usage can outstrip the supply. Which measure to increase the amount of available water demonstrates the best stewardship of the resource?

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Question generated:
In any physical or chemical process, what two quantities are always conserved?