23. During capillary rise of a liquid in a capillary tube, the surface of contact that remains constant is of
(a) Glass and liquid
(b) Air and glass
(c) Air and liquid
(d) All of
Ans. c
(12)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (126)