📊 Physics
Q. Drinks remain hot or cold for a long time in a thermos flask because of the
  • (A) presence of air, which is a bad conductor of heat, in between the double walls
  • (B) silver coating on the inside of the double walls
  • (C) vacuum between the double walls
  • (D) combine effects of (b) and (c)
✅ Correct Answer: (D) combine effects of (b) and (c)

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Ruchi Sharma
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