Physics Worksheet - Annual Examinations For Secondary Schools, 2015 Page 2
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12Section A: This section has 7 questions. Each question carries 10 marks (70 marks).
1. A solar water heater is shown in Figure 1.
a) The solar collector is dark coloured. Why?
storage tank
___________________________________________ [1]
hot water out
solar
energy
b) Why is the back of the solar collector well insulated?
solar
cold water in
collector
___________________________________________ [2]
c) Why is the storage tank placed above and not below
Figure 1
the solar collector?
_______________________________________________________________________________ [2]
d) A student is told that heat from the sun reaches the solar collector by convection. Is this statement
correct? Explain.
_______________________________________________________________________________ [2]
e) Why are the pipes used in the solar water heater made of a metal such as copper?
_______________________________________________________________________________ [1]
f) The pipes are also long and in the shape of a coil. Why?
_______________________________________________________________________________ [2]
2. Maria places two iron cores in a cardboard tube as shown in Figure 2. When she closes the switch she
observes that the iron cores move.
plotting
coil
iron cores
compass
X
Y
battery
switch
Figure 2
cardboard tube
Figure 2
a) Draw arrows to represent the direction of the current through the coil.
[1]
b) End X becomes a ____________ pole while end Y becomes a ____________ pole.
[2]
c) In which direction do the iron cores move? Explain.
_______________________________________________________________________________ [2]
d) Draw an arrow on each plotting compass to indicate the direction of the magnetic field.
[2]
e) State one way by which the magnetic field can be made stronger.
_______________________________________________________________________________ [1]
f) The polarity of the battery is reversed. Explain why the movement of the iron cores is unchanged.
_______________________________________________________________________________ [2]
Physics – Form 5 Secondary – Track 2 – 2015
Page 2 of 12
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