UPSC NDA I 2019 General Ability Solved Paper

Question : 55 of 150

Marks: +1, -0

Which one of the following statements regrading thermos flask is NOT correct?

[NDA I 2019]

The walls of flask are separated by vacuum and made of glass which is a poor conductor of heat
The glass walls themselves have shiny surfaces
The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner wall
The cork supports are poor conductors of heat

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