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

The air above the fire gets hotter and we know that hot air rises up. So, a fire alarm should be placed on the ceiling in a room.

So, option $(d)$ is correct.


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