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 KCPE revision questions and answers on heat transfer

A plastic bottle was placed in a carton and insulating material put around the bottle as shown in the diagram below.
figheat24620201115.JPG
The bottle was then filled with hot water. Which one
of the following would help keep the water hot for a longer time?
A. Putting a lining of aluminium foil around the carton.
B. Using insulating material with large air spaces.
C.Using black insulating material.
D.Using a metal box instead of a carton.

 (2m 49s)
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