Discussion
Which of the following is an example of a fluid?
Answer: B
Mercury is a fluid, because it is a liquid at room temperature and flows. Wood, marble and glass are treated as solids in the question: wood and marble are rigid solids, and glass, though it is an amorphous solid, does not flow at ordinary temperatures.
A fluid is any substance that can flow, meaning a liquid or a gas, and mercury is the only option that is one.
A fluid is any substance that flows and takes the shape of its container, and it includes liquids and gases. Mercury is the only metal that is liquid at ordinary room temperature, so it is the one fluid on the list. Wood and marble hold a fixed shape, and glass is an amorphous solid whose very slow flow is not seen at room temperature.
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