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Slide 1

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Question 1
· 4 (a) In some countries, snow is melted from paths by scattering black coal dust on
top of
· the snow. This helps to use heat energy from the Sun to melt the snow.
· 4 (a) (i) Name the heat transfer mechanism that carries heat from the Sun to the
Earth.
· ..................................................................................................................................
· (1 mark)
· 4 (a) (ii) How does scattering the black coal dust on the snow help the snow to melt
· faster?
· ..................................................................................................................................
· ..................................................................................................................................
· ..................................................................................................................................
· (2 marks)
LO understand energy transfer and U
Sunday, 13 May 2012
values…read more

Slide 2

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Question 2
· 4 (b) Some clouds are held up in the air by
convection currents below them.
· 4 (b) (i) Draw a diagram by adding arrows to
show how the convection currents flow below
the cloud to help keep it up in the air.
· (2 marks)
LO understand energy transfer and U
Sunday, 13 May 2012
values…read more

Slide 3

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Question 3
· 4 (b) (ii) Explain how these convection currents are
formed.
· (3 marks)
· 4 (b) (iii) Which of the following allow convection
currents to flow through them?
· Solids Liquids Gases Vacuum
· Circle all your choices.
· (1 mark)
LO understand energy transfer and U
Sunday, 13 May 2012
values…read more

Slide 4

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Question 4
· 4 (c) A bird's nest is made of many small twigs and leaves, with a layer of
feathers or with
· wool from sheep where available.
· Layer of feathers
· or wool
· Nest made from
· small twigs and leaves
· 4 (c) (i) Explain why feathers and wool are both poor conductors of heat.
· ........................................................................................................................
..........
· ........................................................................................................................
..........
· ........................................................................................................................
..........
· (2 marks)
LO understand energy transfer and U
Sunday, 13 May 2012
values…read more

Slide 5

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Question 5
· 4 (c) (ii) Explain how this layer of feathers or wool reduces the rate of heat loss by
· convection.
· ..................................................................................................................................
· ..................................................................................................................................
· ..................................................................................................................................
· (2 marks)
· 4 (c) (iii) What effect would a thicker layer of feathers or wool have on the U-value
· for the nest?
· Give a scientific reason for your answer.
· ..................................................................................................................................
· ..................................................................................................................................
· ..................................................................................................................................
· ..................................................................................................................................
· (2 marks)
LO understand energy transfer and U
Sunday, 13 May 2012
values…read more

Slide 6

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Question 6
5 An architect is converting two identical barns into houses. The original barns
have hollow
walls as shown in the diagram , the U-value of the original barn is considered to be
too high.
5 (a) Explain what is meant by the U-value of the building. (3)
LO understand energy transfer and U
Sunday, 13 May 2012
values…read more

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