In an experiment, four nails 1, 2, 3 and 4 are fixed with candle wax onto a metal bar and one end of bar is heated by means of boiling water as shown in the diagram below.
A, B, C and D are thermometers inserted in holes along the bar to measure the temperatures at the various points.
(i)
What is the temperature of the boiling water?
(ii)
State the observations that will be made about nails 1, 2, 3 and 4.
(iii)
State the observations that will be made about the temperature recorded by thermometers A, B, C and D.
(iv)
What mode of heat transfer is demonstrated in the experiment?
(v)
State one effect of heat that is associated with the experiment.
(vi)
State the aim of the experiment.
The diagram below is an illustration of a thermos flask.
Study the diagram carefully and answer the questions that follow.
(i)
Name the parts labelled I, II, III, IV and V.
(ii)
How does the device minimize heat loss or gain through
(α)
conduction?
(β)
convection?
(γ)
radiation?
(iii)
State one use of the thermos flask.
The diagram below is an illustration of an experiment that was carried out. In the experiment three pins 1, 2 and 3 were fixed with candle wax onto a metal bar and one end of the bar was heated by means of boiling water. A, B and C are thermometers inserted in holes along the bar to measure the temperature at the various points.
Study the diagram carefully and answer the questions that follow.
i)
Suggest an aim for the experiment.
ii)
What is the temperature of the boiling water?
iii)
State the observation that would be made about the pins 1, 2 and 3.
iv)
State the observation that would be made about the temperatures recorded by the thermometers A, B and C.
v)
State how heat from the sun is transmitted to the earth.
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