Multiple choice

A thermos flask prevents

  1. conduction

  2. radiation

  3. convection

  4. conduction, convection and radiation

  5. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A thermos flask (vacuum flask) prevents heat transfer through all three modes: conduction (by using a vacuum between walls), convection (vacuum eliminates air needed for convection currents), and radiation (silvered surfaces reflect infrared radiation). This comprehensive insulation makes it highly effective at maintaining temperature.

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