The following question 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 P, Q, R and S. You are required to find the proper sequence of the four sentences and mark your response accordingly. S1: Civilization dawned when early man learnt how to produce heat and energy by burning wood. S6: When they have been used, they cannot be replaced. P: Then steam was used to produce electricity. Q: In this century great use has been made of oil and natural gas and the use of atomic reactors has also provided another source of energy. R: Much later, the first industrial revolution was based on the production of steam by burning coal. S: But none of these fuels is renewable. The correct sequence should be Correct Answer R P Q S The given set of sentences talk about how civilization came into being once the caveman or early man discovered and learned to use heat and energy released by the burning of wood. First sentence: From talking about our ancient past, we now have to shift in our not so old past i.e. at the time of industrial revolution when coal was burnt as a fuel. Hence, sentence R. Second sentence: Now we are further into the process when coal was burnt, the steam that rose was used to produce electricity. We are told this only in sentence P. Third sentence: We can note that the sequence is following a timeline and now we come to our immediate present where there are more sources of energy which include nuclear reactors, oil and natural gas. We get this information in sentence Q. Fourth sentence: The last sentence is S which declares a fact that all the previously mentioned resources are non-renewable i.e. they cannot be restored manually and can only be replenished naturally which will take years to happen.