Concept:The key is to find a logical flow from S1 to S6 using the given sentences as steps.
Explanation:S1 introduces the idea of taming science and technology.
P directly follows S1 because it states the first necessary step: having basic knowledge of both science and technology.
Q then provides a relevant quote about science being a useful servant but destructive master — this expands the idea.
S continues the warning: if we do not harness it for welfare, total annihilation must happen.
R then states a consequence: by misuse of science, mankind will meet its doom soon.
Finally, S6 asks why we do not tame atomic energy for peaceful purposes — this logically connects with R's warning about misuse.
Thus, the correct order is P, Q, S, R.
Answer:PQSR