27. At which of the following temperatures, the value of surface tension of water is minimum
(a) 4o C
(b) 25o C
(c) 50o C
(d) 75o C
Ans. d
(10)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)