Multi gas monitors can detect?

• A. The presence of gas but not the exact gas
• B. The exact gas type
• C. Oxygen level only
• D. Flammable gas only

Answer: (A)

Multi-gas monitors are built with multiple sensors to sense different hazardous gases in the environment. Their primary role is to warn you when any target gas is present and to show readings for each gas they monitor. This means the strongest, most general statement about their capability is that they detect the presence of gas. While many models can indicate which gas is rising (through separate sensors like O2, CO, H2S, and LEL), the exam emphasizes the basic function of alerting you to gas presence rather than guaranteeing exact gas identification in every situation. The other options are too narrow, since the device isn’t limited to only oxygen or only flammable gases, and in practice, identifying the exact gas depends on the specific sensor and context.