19. A capillary tube when immersed vertically in liquid records a rise of 3 cm. If the tube is immersed in the liquid at an angle of 60 degree with the vertical. The length of the liquid column along the tube is
(a) 9cm
(b) 6cm
(c) 3cm
(d) 2cm
Ans. b
(71)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)