Question

The silvering in thermos flasks is done to avoid heat transfer by _________.

• A. convection
• B. conduction
• C. radiation
• D. Both $a$ and $b$

Answer 1

The correct option is C radiation

Silver coating on inner surface of the thermos flask, reflects most of the thermal radiation from the hot liquid inside the flask, and prevents heat from escaping by radiation.

Option C is correct.