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Study Stuff for MCA Examinations - NIMCET
Previous Year Question (PYQs)
According to a recent newspaper report, an international team of astronomers studying nearly $446000$ galaxies via the Hubble Space Telescope has confirmed that the expansion of the universe is accelerating. By utilising a technique known as "weak gravitational lensing" to observe how light is distorted by dark matter, researchers mapped the distribution of matter and the history of cosmic expansion, determining that an unknown force called "dark energy" has been driving this acceleration for the past two billion years. This study, which involved $1000$ hours of observation and $600$ Earth orbits by the Hubble telescope, marks the first time such measurements were successfully conducted using gravitational lensing alone, and it further reinforces the existence of an invisible web of dark matter that constitutes $80%$ of the universe.
Which of the following BEST summarises the main idea of the text above?
Solution
The main idea of the passage is that astronomers confirmed the accelerating expansion of the universe.
The passage also says that this acceleration is driven by "dark energy".
The study used "weak gravitational lensing" and involved nearly $446000$ galaxies, $1000$ hours of observation, and $600$ Earth orbits by the Hubble Space Telescope.
Option $1$ only talks about the study details but misses the main finding.
Option $2$ is incorrect because the passage does not say that dark matter was noticed for the first time.
Option $3$ wrongly says that weak gravitational lensing is the best technique to study dark matter, which is not the main idea.
Option $4$ correctly captures the main idea and includes the important method and observation details.
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