Which statement about heat energy is true?
Heat energy does not flow
Heat energy flows from a region of high temperature to a region of low temperature
Heat energy flows from a region of low temperature to a region of high temperature
What is an insulator?
A material that allows heat energy to follow through it easily
A material that will not allow heat energy to flow through it easily
A metal
Which statement about convection is false?
Convection occurs in solids
Convection occurs in liquids
Convection occurs in gases
Why is loft insulation so effective?
It traps air which helps to reduce heat lost from the home
It is itchy but reduces noise in the loft
The fibres do not burn easily if there is a fire
What would make the best material for wrapping around a mug to keep a hot drink warm for as long as possible?
Aluminium foil
A sheet of black paper
Copper foil
What happens to the molecules in a liquid as it gets hotter?
They speed up
They slow down
They stay at the same speed
What happens to the molecules in a solid as it gets hotter?
Start vibrating
Vibrate faster
Vibrate slower
How much energy will a 30 W heater provide in 5 minutes?
6 J
150 J
9000 J
Higher tier only
What is the main reason that metals have high thermal conductivity?
Metals contain free electrons
Vibrations pass from atom to atom transferring heat energy as they do so
Metals can be heated to high temperatures
Which statement is true about a dull, matt surface?
A dark, matt surface is worse at absorbing heat energy than a light shiny surface
A dark, matt surface is better at absorbing heat energy than a light shiny surface
A dark matt surface is worse at radiating heat energy than a light shiny surface
Look at the table below:
Which one of these metals would be best to use for the bottom of a saucepan?
Copper
Iron
Aluminium