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Warm Air and Cool Air

A fire alarm ...

Question

Question 1

A fire alarm usually detects smoke in case of fire. Where should such an alarm be placed in a room?

(a) Near the door

(b) On the floor

(c) On any wall

(d) On the ceiling

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Solution

The air above the fire rises upwards as it becomes hotter, so the alarm should be placed on the ceiling.

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