Reading Comprehension: Inference Questions

The passage suggests that stars that do not reach a speed of 1000 km/s most likely

Incorrect.

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The passage tells us that most blue giants that approach a black hole will not be accelerated to the escape velocity of the galaxy.  Since the passage does not discuss the sizes of other stars, except those that also exceed 1000 km/s, information about the size of stars that fail to reach escape velocity is too far beyond the scope of the passage.

Incorrect.

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The passage tells us that blue giants that are accelerated to 1000 km/s do require a certain approach angle; however, the passage lists other possible reasons why a star may not reach the escape velocity of the galaxy.

Incorrect.

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Of the binary blue giants that closely approach a black hole, those that do not reach 1000 km/s will likely be consumed by the black hole, but this answer choice goes too far beyond the scope of the passage by suggesting that all stars that do not reach this speed will be consumed. 

Excellent!

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The passage tell us that .2% of the speed of light, or 1000 km/s, is the minimum escape velocity of a galaxy.  The passage goes on to tell us that the escape velocity is the point at which speed exceeds gravitational pull.  Therefore, stars that do not reach 1000 km/s will not escape the gravity of a galaxy.

Incorrect.

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According to the passage, blue giant stars that do reach a speed of approximately 1000 km/s. are normally part of a binary star system.

are associated with a binary system
will not escape the force of gravity in the galaxy
will be consumed by a black hole
do so as a result of an improper approach angle
are smaller and lighter than blue giants 

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