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Worksheets705 - Transfer of Heat
Total questions: 20
Worksheet time: 24mins
Heat can be transferred in three ways, there are :
Conduction
Convection
Radiation
Reflection
(a) is the transfer of energy from one molecule to another by direct contact.
(a) is the movement of heat by a fluid such as water or air.
(a) is the transfer of heat by electromagnetic waves, which does not require any medium to help with the transfer process.
Thermal conductivity of different metals is different.
True
False
The higher the temperature, the higher will be the radiation.
True
False
Convection currents always rise upwards and not sideways.
True
False
Which matters transfer heat by conduction are fastest ? Solids, liquids, or gases ?
Solids
Liquids
Gases
Pick the good conductor(s) :
Pick the good insulator(s):
Dark-coloured surfaces are good _________________ of heat.
absorbers
reflectors
radiators
insulators
Light-coloured or shiny surfaces are good _________________ of heat.
absorbers
reflectors
radiators
insulators
Example of convection currents of daily life:
Air-Conditioner
Radiator
Boiling Water
Refrigerator
It is recommended that air conditioners and ventilators should be fixed __________________ of a room.
near the roof
at the top
at the bottom
near the floor
The factor(s) determine the amount of radiation absorbed by an object :
The colour of the surface
The texture of the surface
Surface temperature
Surface area
Example of application of radiation in daily life:
Wearing dark-coloured clothes in colder climate
Wearing light-coloured clothes in hotter climate
The base of cooking vessels (eg: pans, pots) is painted black
Light colours paints are used on buildings that built in hot climate places.
A (a) is a device that prevents transmission of heat by minimizing the process of conduction, convection, and radiation.
Who invented thermos flask? What year that thermos flask invented?
Robert Soulen ; 1779
James Dewar ; 1892
Edgar Cortright ; 1975
John Haynes ; 1948
There is a thermos flask that has a double-walled glass inner bottle. Due to vacuum between the two walls, this can prevents heat loss due to :
convection
conduction
reflection
radiation
The silver coating on the inner bottle of a thermos flask is use to prevents heat loss due to :
reflation
convection
conduction
radiation
