39th B.P.S.C. (Pre) 1994
By opening the door of a refrigerator kept in a room -
aYou can cool the room by a few degrees
bYou can cool it to the temperature of a refrigerator
cYou can eventually heat the room up a bit✓ Correct
dYou can neither heat nor cool the room
Explanation
If the refrigerator door is kept open in a room, the room temperature increases, and as a result, the room becomes slightly warmer.
general-science