Q.1
Some types of thermometer are filled with mercury, a liquid metal. Why do they work?
  • Mercury is a metal so it conducts heat into the thermometer
  • Mercury behaves in an unusual way
  • Particles of liquids expand when they are heated and contract when they are cooled so the mercury fills more or less of the thermometer depending on the temperature
  • The particles move faster or slower depending on the temperature so the mercury expands and contracts
Q.2
What happens to the particles of water vapor as it changes from a gas into a liquid to form a film of water on the inside surface of a cold window?
  • When the particles of the water vapor hit the window, they stick to it
  • The particles lose energy to the cold surface, slow down and become closer together
  • The particles clump together because of the light coming through the window, forming water
  • The particles speed up, forming water droplets
Q.3
What happens to a gas in a sealed container when it is heated?
  • The gas explodes
  • The pressure of the gas increases
  • The gas implodes
  • The gas condenses
Q.4
Which states of matter contract when you cool them?
  • Only gasses
  • Only solids
  • Liquids and gasses
  • All of them
Q.5
What will a substance do when it is heated?
  • It will expand
  • It will contract
  • It will burn
  • It will explode
Q.6
Which of the following would increase the speed at which a liquid evaporates?
  • Covering the liquid with a beaker
  • Making sure that there were no drafts
  • Spreading it out over a larger area
  • All of the above
Q.7
When a liquid is evaporating it cools down. Why?
  • The faster particles escape leaving the slower particles behind
  • There are fewer particles
  • Evaporation needs a breeze and breezes cool things down
  • It has a smaller volume than before
Q.8
Why does hot air rise?
  • Heat naturally goes upwards
  • It is pushed there by the cold air
  • It is less dense than colder air
  • It doesn't, this is a myth
Q.9
According to the kinetic theory, what are the particles in a heated solid doing?
  • Vibrating more slowly than when the solid was cool
  • Vibrating more rapidly than when the solid was cool
  • Moving around more slowly than when the solid was cool
  • Moving around more rapidly than when the solid was cool
Q.10
Why are warm fluids less dense than their cold equivalent?
  • Some of the fluid escapes from the particles so they are lighter
  • Their particles are closer together
  • Hot particles lose their quarks and become lighter
  • Their particles are further apart
0 h : 0 m : 1 s