8. Two capillaries made of same material but of different radii are dipped in a liquid. The rise of liquid in one capillary is 2.2 cm and that in the other is 6.6 cm. The ratio of their radii is
(a) 9 : 1
(b) 1 : 9
(c) 3 : 1
(d) 1 : 3
Ans. c
(11)