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| Focus: Explain the operation of measuring instrument and predict the effects of alterations of its components. | ||||||
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Questions / instructions: |
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%
response
|
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|
y4
1999(1995) |
y8
1999(1995) |
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 |
1. What do people use this piece of equipment for? |
to
measure temperature
|
65
(75)
|
90
(96)
|
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| If the student doesn't know, tell them it is used to find out what the temperature is. |
a
|
a
|
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| 2. What is this piece of equipment called? |
thermometer
|
44
(47)
|
83
(26)
|
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| If the student doesn't know tell them it is a thermometer |
a
|
a
|
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| 3. Can you explain how the thermometer works? |
Rising
temperature causes liquid to expand, pushing it along the tubing.
clear and correct |
3
(10)
|
16
(25)
|
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|
limited
understanding
|
66
(40)
|
71
(45)
|
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| 4. What would happen: |
a
|
a
|
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| • if you put the thermometer in some boiling water? |
measures
100
 C; (at sea level) |
8
(8)
|
29
(29)
|
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|
goes
to top
|
57
(66)
|
43
(55)
|
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| •
if you put the thermometer in something that is 130C?
|
breaks
|
20
(20)
|
40
(46)
|
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|
goes
to top
|
33
(43)
|
38
(39)
|
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| Point to the appropriate part of the thermometer for the student: |
a
|
a
|
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| 5. What would happen: |
a
|
a
|
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| • if the hole in the long part of the thermometer was fatter? |
move
less as temperature changed
|
3
(11)
|
10
(16)
|
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|
read
lower
|
15
(9)
|
28
(18)
|
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|
be
inaccurate
|
5
(14)
|
14
(12)
|
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| • if the bulb was made of thicker glass? |
take longer to register temperature change
|
7
(20)
|
29
(46)
|
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| Commentary: Year 8 students performed substantially better than year 4 students. Changes in performance between 1995 and 1999 were mixed, with some improvements and some declines in performance. Overall, there was a small decline in performance. |
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