Subject :NSO Class : Class 4
The movements of the hot and cold air set up a convection current. This explains why ________.
AAn air conditioner is placed at the ceiling end of the wall.
BA heater is placed as low as possible in room.
CThe back of a refrigerator is often painted black.
DBoth A and B
Ans 1:
Class : Class 7
D
Ans 2:
Class : Class 4
the correct ans is D