CTET Paper II (Upper Primary: Class 6-8)

Heat - Transfer of Heat question bank (Mathematics & Science)

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Q1.

Which of the following 'medium' is present between the inner and outer layers of a thermos flask and why?

CTET Paper II - Dec 2024 (15 Dec), Q66 (Official PYQ)

(A)
Air, because it prevents loss of heat due to conduction
(B)
Steel, because it prevents loss of heat due to radiation and convection
(C)
Vacuum, because it prevents loss of heat due to conduction and convection
(D)
Air, because it prevents loss of heat due to radiation and conduction
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