Direction: In this section, each item consists of six sentences of a passage. The first and the sixth sentences are given in the beginning as S1 and S6. The middle four sentences in each have been jumbled up and labelled as P, Q, R and S. You are required to find the proper sequence of the four sentences and mark your response accordingly on the Answer Sheet.

S1 : After the rain has fallen on the mountains, most of it sinks into the ground where it collects in pools underground.
S6 : After a river has flowed through a human habitation it collects debris and other waste material.
P : Hence we have the beginnings of a mountain stream.
Q : Some of the water joins the streams and eventually flows into bigger rivers which then carry it to the seas or oceans.
R : The water which collects in pools underground may burst out into springs and flow down the slope.
S : Usually the water at the top of mountains is clean and pure as it has not been polluted by men who usually pollute the rivers flowing through the plains.