20. Compressed air in the tube of a wheel of a cycle at normal temperature suddenly starts coming out from a puncture. The air inside
(a) Starts becoming hotter
(b) Remains at the same temperature
(c) Starts becoming cooler
(d) May become hotter or cooler depending upon the amount of water vapour present
Answer-c
(4)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)