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 : Scientific inventions and discoveries are important because they lead to the creation of mechanisms and artifacts which improve our living conditions.
S6 : All these inventions have turned out to be quite beneficial in peacetime.
P : Rocketry and missiles opened the way for space exploration and the epochal landing of man on the Moon.
Q : Inventions and discoveries come about sometimes by accident but mostly by design.
R : Most of the discoveries in the 20th century were the results of purposeful investigations, though some like penicillin were discovered accidentally.
S : Roentgen discovered X-ray by accident but the Curies laboriously pursued the radium and discovered it eventually in 1898.

The correct sequence should be: