Question

A refrigerator, with its power on, is kept in closed room with its door open. The temperature of the room will _________.

• A. fall
• B. rise
• C. remains the same
• D. None of the above

Answer 1

Answer: (B)

rise

If refrigerator's door is left open, the refrigerator's compressor will try to cool the air of whole room.

The work done by compressor and heat absorbed will get rejected as heat in the room itself.

$Q_{out}=Q_{in}+W$

So heat released would be more than the heat absorbed, and room's temperature will rise.