Thermos flask - class-VIII
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Multiple Choice
A thermos flask is designed to prevent the contents of the flask from losing heat. Which of the following statements concerning the design of thermos flasks is incorrect?
- The stopper helps reduce heat loss by convection
- The glass walls are silver coated to reduce emitted radiation
- The flask is designed to prevent heat loss by conduction, convection and radiation
- The vacuum between the glass walls prevents heat loss by preventing radiation