Physics Worksheet - Annual Examinations For Secondary Schools, 2013 Page 8
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107.(a) The diagram below shows a simple heat exchanger. Heat is transferred from the hot
water to the cold water through the walls of the pipe.
Rachel and Caroline investigate if the efficiency of a heat exchanger depends on the
material used to make the pipe. The students test three different materials.
Thermometer
Cold water
Hot water
out
in
Cold water
Pipe
(i)
Name the main process by which heat is transferred from the hot water inside the pipe
to the cold water in the tank.
__________________________________________________________________________
(1)
The results obtained are recorded in the table below.
Initial temperature
Final temperature of
Change in
Material
o
o
o
of cold water (
C)
the cold water (
C)
temperature (
C)
Copper
20
36
Glass
20
23
Plastic
20
21
(ii)
Fill in the missing values in the above table.
(3)
(iii) Name one precaution to obtain accurate results.
__________________________________________________________________________
(2)
(iv) Use the above table to choose which one of the three materials is the best heat
exchanger. Give a reason for your answer.
__________________________________________________________________________
__________________________________________________________________________
(2)
3
3
(v)
The density of water is 1 g/cm
and volume of water is 15 000 cm
. Calculate its mass.
__________________________________________________________________________
__________________________________________________________________________
(2)
Physics – Secondary Schools – Track 3 – Form 3 – 2013
Page 8 of 10
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