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) (ii) and (iii)
d) (i) and (iv)​

Answer 1

Answer:

(ii),(iii)

Explanation: