Question

The sides of the double walls of a thermos flask facing each other are made shiny because_______________.

• A. shiny surfaces absorb more heat.
• B. shiny surfaces are bad radiators of heat.
• C. shiny surfaces are bad conductors.
• D. none of these

Answer 1

The correct option is B

shiny surfaces are bad radiators of heat.

A thermos flask is a household item that doesn't allow heat loss or heat gain by material stored in it.

1. The sides of the double-walled flask facing each other are silvered as this prevents heat loss due to radiation.
2. Because the shiny surfaces are bad absorbers and radiators of heat.

Hence, option B is correct.