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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 4
the correct ans is D

Ans 2:

Class : Class 7

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