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WorksheetsTransfer of thermal energy
Total questions: 10
Worksheet time: 50mins
Density changes are responsible for which method of thermal energy transfer?
conduction only
convection only
radiation only
conduction, convection and radiation
In a vacuum flask, which methods of heat transfer are prevented by the vacuum?
conduction only
convection only
conduction and convection only
conduction, convection, and radiation
A student needs a double-walled glass vessel to contain a hot liquid. What reduces heat losses by radiation?
a vacuum in the space between the walls
painting surface Q black
painting surface R black
painting surface S silver
The tubes inside solar heating panels use the Sun’s radiation to warm water. Why are the tubes painted black?
Black surfaces absorb radiation well
Black surfaces conduct heat well
Black surfaces emit radiation well
Black surfaces reflect radiation well
How is heat conducted in a metal?
by movement of electrons through the metal only
by movement of atoms through the metal only
by vibration of atoms and movements of electrons through the metal
by vibration of atoms only
A heater is designed to radiate thermal energy.
Which change to the design decreases the thermal energy emitted by radiation?
a darker coloured surface
a higher surface temperature
a larger surface area
a shinier surface
In which states of matter does convection occur?
gases, liquids and solids
gases and liquids only
gases and solids only
liquids and solids only
A slice of bread is placed under a red-hot electric grill to make toast. How does heat energy reach the bread?
conduction and convection
conduction only
convection and radiation
radiation only
A silver cup is filled with boiling water from a kettle.
A man touches the outside surface of the cup and finds that it is extremely hot.
Why is the surface so hot?
Convection takes place in the boiling water
Silver is a good conductor of heat
The boiling water gives out latent heat
The shiny surface is a good emitter of infra-red radiation
Four wet towels are hung out to dry as shown.
Which towel dries most quickly?
