Traffic policemen on duty at busy street crossings during heavy traffic rush hours are advised to use:__________?
Correct answer: C. Oxygen tank
- A. Hydrogen tank
- B. Nitrogen tank
- C. Oxygen tank
- D. None of these
Explanation
Traffic police working in polluted, congested areas may use oxygen supplied from an oxygen tank to reduce the effects of inhaling air containing harmful exhaust gases. Nitrogen does not support respiration, and a hydrogen tank would create a serious fire risk. Students may choose none of these because oxygen does not remove pollutants, but it can provide cleaner breathing gas.
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