Q. The vacuum flasks reduce heat loss by minimizing __________.

वैक्यूम फ्लास्क __________ को कम करके गर्मी के नुकसान को कम करते हैं।

A
Only conduction
केवल संचालन
B
Only convection
केवल संवहन
C
Only radiation
केवल विकिरण
D
All three modes
सभी तीन मोड

Explanation

A vacuum flask (thermos) is designed to minimize all three types of heat transfer:

  • Conduction: Stopped by vacuum between the walls.

  • Convection: No fluid in the vacuum to carry heat.

  • Radiation: Inner surfaces are silvered to reflect heat.

This keeps contents hot or cold for a long time.

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