PrepTest 121, Section 2, Question 15
According to the theory of gravitation, every particle(447 more words not shown)
Based on the passage, the(10 more words not shown)
- AObservable matter constitutes(10 more words not shown)
- BCurrent theories are(16 more words not shown)
- CThe key to(13 more words not shown)
- DIt is unlikely(19 more words not shown)
- ENeutrinos probably account(7 more words not shown)
Reading the passage
This is a broad inference question, so I don't have a single new statement to predict. We know the writer treats gravity as the force shaping the large structures and investigates whether neutrinos can supply some of the mass needed. I'll check the choices against that account, keeping my own doubts about the theory separate.
Working the answers
- A
The 90 percent is the missing portion. This assigns that figure to the observable matter instead.
- B
The opening identifies the force: gravitation. Not having located enough matter to explain the observed structures is different from being unable to identify any attractive force.
- C
Even the highest estimated neutrino mass accounts for only about 20 percent of the missing mass. Pinning down its exact value would not by itself resolve the remaining problem.
- DCorrect
This isn't stated as a separate rule, so I would want to check it. The first paragraph explains the discrepancy by proposing matter that supplies additional gravitational force. The rest investigates that proposal, rather than searching for another kind of force. D fits the writer's working explanation; it doesn't claim that no other forces exist anywhere.
- E
At most about 20 percent is not most of the missing mass.
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