Physics Paper 2, May/June. 2012  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments

Question 7

Explain why it is desirable to install an air conditioner near the ceiling of a room and not close to the floor.


 There was lack of knowledge on the demand of the question. Only few candidates saw it from the air circulation by convection point of view.
Performance was poor.
I he expected answer is
Air molecules near the ceiling get cooled, become denser and sink. Warmer air molecules below being lighter rise to the top, get cooled, become denser and sink again; thus conventional current i set up

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