30. Surface tension of a liquid is found to be influenced by
(a) It increases with the increase of temperature
(b) Nature of the liquid in contact
(c) Presence of soap that increases it
(d) Its variation with the concentration of the liquid
Ans. d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a