20. Force necessary to pull a circular plate of 5 cm radius from water surface for which surface tension is 75 dynes/cm, is
(a) 30 dynes
(b) 60 dynes
(c) 750 dynes
(d) 750 π dynes
Ans. d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a