WorksheetsCh09 Transfer of Thermal Energy_sam yu bin
Total questions: 10
Worksheet time: 4mins
which of the following kettles loses the most heat through radiation
white plastic kettle
shiny silver-colored kettle
dull black metal kettle
shiny black plastic kettle
which of following are true?
cold air rises while hot air sinks
hot air rises while cold air sinks
dull objects emit more heat
shiny objects emit lesser heat
The reason for silvering is to reduce (a)
why is the freezing compartment placed at the top?
Cold air from the freezing compartment sinks
To create a convection current
It is cheaper
To radiate cold air down
Heat cannot be conducted through a (a)
why does the thermal flask get colder as signa drinks more?
Heat is conducted through the vacuum
More air will be trapped when the cap is open ,so a larger convection current will be created
More air will be trapped when the cap is open ,so a smaller convection current will be created
Heat radiates through the walls
Explain why water circulates through a rectangular flask when it is heated from below.
When water is heated, its volume increases and becomes more dense
The hot water conducts heat upwards
When water is heated, its volume increases and becomes less dense
The water radiates heat to the top
Fiberglass is a good insulator as it traps (a)
why is metal a better conductor of heat than glass
glass has delocalised free-moving electrons
metal has delocalised free-moving electrons
Metal is an insulator of heat
glass is an insulator of heat
If an object has particles that are moving very quickly, the object 's temperature is probably (a) .
