Question

In a thermos flask, heat loss due to conduction is prevented because (i) glass and cork are poor conductors of heat (ii) conduction cannot take place in vacuum as it requires a medium (iii) the stopper and the vacuum prevent heat loss because of absence of air (iv) the highly polished silver walls prevent heat loss a) (i) and (ii) c) (iii) and (iv) b) (i) and (iii) d) (i) and (iv)​

Answer 1

Answer:

3 and 4

Explanation:

see the relationship

Answer 2

Answer:

option b

glass and cork are poor conductors