12. Match Column A with Column B

(A)  p-ii, ,q-iv,, r-i and s-iii
(B)  p-iii, ,q-iv,, r-i and s-ii
(C)  p-iii, ,q-i,, r-iv and s-ii
(D)  p-ii, ,q-i,, r-iv and s-iii

13. The dimension of the product of surface tension and length is :
(A)  [M L–1 T–1]
(B)  [M L T–2]
(C)  [M L T–1]
(D)  [M L0T–2]