Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2012 Page 11
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12c.
One of the metal beakers is painted black and the other is painted silver.
i.
Which beaker, A or B, is coloured black? __________
ii.
Give one reason for your answer. ___________________________________________
iii.
Name the two main processes through which heat is lost by the water in the covered,
black painted beaker.
_______________ and _______________
iv.
State the other process through which heat energy is also lost by the water in both
beakers when not covered. _______________
(6)
d.
When the investigation is over Joseph notes that the temperature of the water in each beaker
is 20°C. An hour later he takes the temperature of the water in both beakers again and finds
that it is still 20°C. Explain why there is no further temperature drop.
________________________________________________________________________________
________________________________________________________________________________
(2)
12.
This question is about the magnetic effect of current flowing through a solenoid.
a.
Robert and Sharon set up an experiment to investigate how the strength of the magnetic field
varies with the number of turns of wire. They are provided with the following apparatus:
a 12 V d.c. supply; five iron-core solenoids labelled A, B, C, D and E having 500, 1000,
1500, 2000 and 2500 turns respectively; an ammeter, a variable resistor, a switch, connecting
wire; iron nails in a small plastic dish, wooden stand and clamp
Explain how they should carry out this investigation. Your answer should include:
i.
a labelled diagram of the experimental setup,
(4)
ii.
a brief account of how the investigation is carried out,
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
(4)
Physics – Secondary Schools – Track 3 - Form 5 – 2012
Page 11 of 12
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