Question

Q No. 16.
Things remain hot for longer time in a thermos bottle because:
a) air between the two walls of the thermos flask is evacuated
b) walls of thermos bottle are made up of steel
c) walls of the thermos bottle are made up of glass
d) walls of thermos bottle are good conductor
کیونکہ
سے ہوا کو خالی کرالیا جاتا ہے
میں سٹیل کی بنی ہوتی ہیں
- میں کلاس کی بنی ہوتی ہیں
میں اچھی موصل ہوتی ہیں

Answer 1

Answer:

Answer- (a)

Explanation:

The Answer is option (a)

Answer 2

Answer:

option a...

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