In this section, each item consists of six sentences of a passage. The first and sixth sentences are given in the beginning as S1 and S6. The last 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.
S1: The machines that drive modern civilisation derive their power from coal and oil.
S6: Nuclear energy may also be effectively used in this respect.
P: but they are not inexhaustible
Q: these sources may not be exhausted very soon
R: a time may come when some other sources have to be tapped and utilised
S : power may, of course, be obtained in future from forests, water, wind and withered vegetables
The proper sequence should be
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