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Para-jumbles 15 / 100

a. While its precise nature remains elusive, current models suggest dark energy constitutes approximately 68% of the total mass-energy of the universe, dwarfing ordinary matter.
b. This unexpected observation led to the hypothesis of 'dark energy,' a mysterious repulsive force thought to be driving this cosmic acceleration.
c. Understanding dark energy is thus crucial for predicting the ultimate fate of the cosmos, dictating whether it will continue to expand indefinitely, eventually tearing itself apart, or undergo some other end-state.
d. The discovery that the universe's expansion is accelerating, rather than slowing down, revolutionized modern cosmology in the late 20th century.

These sentences, when properly sequenced, form a coherent paragraph. Which of the options best outline their correct order?

1. d, b, c, a

2. b, d, a, c

3. d, b, a, c

4. a, d, b, c

Correct Answer: 3 (d, b, a, c)
To solve "Sentence Rearrangement" or "Para-jumble" tasks, look for the logical flow of ideas:
Step 1 (Introduction): Sentence (d) serves as the best introductory sentence. It establishes the broad historical context and the central scientific discovery – the accelerating expansion of the universe – that underpins the entire paragraph.
Step 2 (Elaboration): Sentence (b) logically follows (d) as it directly addresses the "unexpected observation" mentioned in (d) and introduces the proposed explanation: 'dark energy.' The demonstrative pronoun "This" clearly links it to the preceding sentence.
Step 3 (Secondary Factor): Sentence (a) elaborates further on the concept of 'dark energy' introduced in (b). It details its mysterious nature and its significant estimated proportion of the universe's total mass-energy, building upon the definition provided.
Step 4 (Conclusion/Result): Sentence (c) acts as the concluding statement, highlighting the ultimate significance of understanding dark energy in terms of predicting the universe's destiny. The word "thus" indicates a conclusion drawn from the preceding information.

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