Thermos flask - class-VIII

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Question 1 of 16

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?

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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

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