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      Question

      The Nobel Prize for physics this year is for the

      discovery of the gravitational waves released by violent events in the universe such as the mergers of black holes. ________________. Since then three more detections have been made, the latest one on September 28, 2017. The discovery is due to an extremely delicate experiment. Gravitational waves were predicted by Einstein almost 100 years ago From the given options, choose the one that completes the paragraph in the most appropriate way.
      A It also throws up the possibility of detectors that can look at the beginning of the universe. Correct Answer Incorrect Answer
      B The discovery and the repeated detection (four times now) has made the possibility of gravitational wave astronomy very real. Correct Answer Incorrect Answer
      C The discovery can pave the way for proving the general theory of relativity, so that we can look deeper and deeper into the universe. Correct Answer Incorrect Answer
      D The first time this was detected was on September 14, 2015, by the LIGO-VIRGO collaboration. Correct Answer Incorrect Answer
      E Gravitational wave astronomy is a way of mapping out some of the most violent processes in the universe such as black hole or neutron star mergers that cannot be detected with light or the conventional methods. Correct Answer Incorrect Answer

      Solution

      Solution The third sentence in the paragraph starts with ‘Since then’. So, in the second sentence, some date or event must be mentioned. No other sentence other than option 4 provides such a date or event. So, undoubtedly, option 4 is correct.

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