Annual Examinations For Secondary Schools Physics Worksheet - 2012 Page 10

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11.
This question is about heat transfer.
Joseph investigates the heat loss
stirrer
from two metal beakers, A and B.
The beakers are identical except
for their outside colour.
a.
Joseph pours equal volumes of hot water into the two beakers. He inserts the temperature
sensors in the water through the small hole in the beaker covers.
Graph of temp θ θ θ θ (
o
C) against time t (min)
100
90
80
70
Beaker A
60
50
Beaker B
40
30
20
10
0
0
2
4
6
8
10
12
Tim e (m inutes)
From the above graph;
i
what was the initial temperature of the water?
_______________
(1)
ii.
for how long were readings taken during the experiment?
_______________
(1)
iii
what was the approximate temperature difference between the beakers at the end of the
experiment?
___________________________________________________________________________
(2)
iv.
which beaker (A or B) is cooler at the end of the experiment?
_____________
(1)
v.
the colour of the beaker which cooled faster was _______________.
(2)
vi.
Heat was lost from the beakers by: (mark with a
where appropriate):
Yes
No
Conduction
Convection
Radiation
(3)
vii.
Give two precautions that should be taken when performing this experiment.
________________________________________________________________________________
________________________________________________________________________________
(2)
Physics – Secondary Schools - Track 2 – Form 5 – 2012
Page 10 of 12

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