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Gcse Science
Physics - Conduction And Convection (Aqa)
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Q.1
Why do hot air ballons rise?
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The flames from the burner are going upwards and they push the balloon into the air
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The helium they contain is lighter than air
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The heat from the burners causes the air inside to become less dense
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They only rise because the pilot throws out some weight from the basket
Q.2
Which state(s) of matter is (or are) fluids?
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Solids and liquids
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Liquids only
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Liquids and gases
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Gases only
Q.3
In what substances can convection occur?
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Solids
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Only liquids
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Liquids and gases
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Only gases
Q.4
"Particles with more energy move in to take the place of particles with less energy" What method of heat transfer is being described in the previous sentence?
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Sublimation
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Conduction
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Convection
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Radiation
Q.5
On a sunny day, why is it slightly harder to swim back to the shore of a lake than to swim towards the centre?
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The sun makes the water at the edge of the lake expand more than at the centre so you are swimming uphill
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The sun heats shallow water at the edge faster than the deep water, creating a convection current that flows towards the centre
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You are more tired because you have already swum out to the centre of the lake
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There is no difference
Q.6
How does extra heat affect the particles of a metal?
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It makes them vibrate faster
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It makes them move around more and change places, reducing its density
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It slows down the movement of the particles
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It melts them
Q.7
What is the main way that heat passes through a brick in the wall of a building?
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Convection
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Conduction
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Radiation
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All of the above
Q.8
Houses built with thick stone walls usually stay cooler inside during the summer than houses built with thinner brick walls. Why might this be?
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Conduction is slower through the thicker walls
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No convection can occur through the thicker walls
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No conduction can occur through the thicker walls
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The clay used to make bricks always contains some impurities that make it a better conductor of heat than stone
Q.9
Why are metals good heat conductors?
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They are shiny and solid
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Their particles are far apart
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Their particles are packed close together
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They are malleable and ductile
Q.10
Thunderstorms are created by which form(s) of energy transfer in the atmosphere?
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Convection
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Evaporation and conduction
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Radiation only
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Conduction and radiation
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