With multiple-choice questions, only one of the answers can be correct. If there are four choices, three must be wrong. An answer may be correct because it is precise or because it is vague. An answer may be wrong because it is too exaggerated or too restrictive. Consider the following question:

A firefighter is required to wear the mask at any fire scene where there is a lot of smoke and whenever there is clear danger of hazardous chemicals in the air. If a firefighters mask f... [read more]