Q.1
Why do hot air ballons rise?
  • The flames from the burner are going upwards and they push the balloon into the air
  • The helium they contain is lighter than air
  • The heat from the burners causes the air inside to become less dense
  • They only rise because the pilot throws out some weight from the basket
Q.2
Which state(s) of matter is (or are) fluids?
  • Solids and liquids
  • Liquids only
  • Liquids and gases
  • Gases only
Q.3
In what substances can convection occur?
  • Solids
  • Only liquids
  • Liquids and gases
  • 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?
  • Sublimation
  • Conduction
  • Convection
  • 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?
  • The sun makes the water at the edge of the lake expand more than at the centre so you are swimming uphill
  • The sun heats shallow water at the edge faster than the deep water, creating a convection current that flows towards the centre
  • You are more tired because you have already swum out to the centre of the lake
  • There is no difference
Q.6
How does extra heat affect the particles of a metal?
  • It makes them vibrate faster
  • It makes them move around more and change places, reducing its density
  • It slows down the movement of the particles
  • It melts them
Q.7
What is the main way that heat passes through a brick in the wall of a building?
  • Convection
  • Conduction
  • Radiation
  • 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?
  • Conduction is slower through the thicker walls
  • No convection can occur through the thicker walls
  • No conduction can occur through the thicker walls
  • 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?
  • They are shiny and solid
  • Their particles are far apart
  • Their particles are packed close together
  • They are malleable and ductile
Q.10
Thunderstorms are created by which form(s) of energy transfer in the atmosphere?
  • Convection
  • Evaporation and conduction
  • Radiation only
  • Conduction and radiation
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