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10Plastic is a good conductor of heat.
A thermos flask can keep both hot and cold liquids for a long time.
The thermos flask has a single-walled glass vessel.
The space between the two walls of a thermos flask is a vacuum.
Vacuum reduces heat transfer by conduction and convection.
The walls of the glass vessel are made very thick.
Silvered surfaces help in reducing heat loss due to radiation.
The outer cover of a thermos is made only of glass.
A cork stopper is used to close the mouth of the thermos.
Heat can easily enter or escape from a thermos flask.
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The main purpose of a thermos flask is to
The vessel inside a thermos flask is made of
The space between the walls of a thermos flask contains
Which heat transfer is prevented by vacuum?
Silvered surfaces mainly reduce heat loss due to
The outer protective cover of a thermos is usually made of
The stopper of a thermos is made of
The vessel in a thermos is kept over an insulating
Which part prevents heat transfer through radiation?
Heat remains inside a thermos because it is
A ______ flask keeps liquids hot or cold for a long time.
The thermos consists of a glass vessel with ______ walls.
The space between the walls is a ______.
Vacuum reduces heat loss by ______ and convection.
The walls are coated with ______ surfaces.
Silvered surfaces reduce heat loss due to ______.
The glass vessel is protected by a ______ or plastic cover.
The mouth of the vessel is closed with a ______ stopper.
The vessel is placed on an insulating ______.
A thermos flask is ______ insulated.