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Standard VII
Physics
Working of a Thermos flask
The shining s...
Question
The shining surface in a thermos flask decreases the outgoing heat by ______________.
A
conduction
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B
refraction
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C
reflection
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D
convection
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Q.
Fill in the blanks with the proper word from the brackets.
(radiation, white, conduction, blue, convection, bad conductor, good conductor, black, reflection)
(a) Maximum heat is absorbed by a ................ coloured object.
(b) ...................... of heat does not require a medium.
(c) Conduction of heat takes place through a .......................... substance.
(d) The shining surface in a thermos flask decreases the outgoing heat by ......................... .
(e) Cooking utensils are made from metals due to their property of ................. .
(f) The earth receives heat from the sun by .................... .
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The vacuum between the walls in a thermos flask minimises heat loss by
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Draw a neat labelled diagram of a thermos flask. How does it prevent transfer of heat by conduction, convection or radiation?