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WorksheetsTransfer of Thermal Energy
Total questions: 10
Worksheet time: 3mins
Oil storage tanks are painted white because white surfaces are
good absorbers of radiation
good emitters of radiation
poor absorbers of radiation
poor emitters of radiation
Convection of heat
can happen in a solid
does not happen in a gas
only happens in fluids
does not happen in a liquid
Which of the following is the poorest conductor of heat?
air
copper
glass
water
On a hot day, a drink in a bottle can be kept cool by standing it in a bowl of water and placing a wet cloth over it.
How is the drink kept cool?
Hot air cannot escape from the bottle.
The drink cannot evaporate from the bottle.
The cloth conducts heat from the bottle into the water.
Water evaporating from the cloth cools the drink.
Ice cubes are used to cool a drink. What is the main process by which the liquid at the bottom of the glass cools?
conduction
convection
radiation
diffusion
Why does the ice take a long time to melt, even when the water at the top of the test-tube
is boiling?
Convection cannot occur in water.
Ice is a poor radiator of heat.
Convection is taking place.
Water is a poor conductor of heat.
Why the the cooling fins at the back of a refrigerator painted black?
black surfaces are good absorbers of radiation
black surfaces are good emitters of radiation
black surfaces are poor absorbers of radiation
black surfaces are poor emitters of radiation
In cold countries, animals grow thicker layers of fur in winter because
it is a good conductor of heat.
it is a poor conductor of heat.
it traps more air, which is a good conductor of heat.
it traps more air, which is a poor conductor of heat.
The diagram shows a plate-warmer in which candles are used as heaters. The flames of the candles do not touch the underside of the top tray. How does heat pass to the top tray?
mainly conduction and some convection
mainly conduction and some radiation
mainly convection and some radiation
mainly radiation and some conduction
The following objects all lose heat.
Which object loses all of its heat by radiation?
the heating element of a water heater at 50 degrees Celsius, in water
a white space shuttle at 20 degrees Celsius, in space
a plastic block with black surfaces at 50 degrees Celsius, in air
an iron block with shiny surfaces at 120 degrees Celsius, in air
