dheeru500 Wrote:Hi Ron,
This is my understanding of the question . 
In this question, we have a comparison between uses of Applied Science and uses of Pure Science. I believe Pure Science has Potential uses and as Pure Science is Singular , we need to Use it's rather than their.
I can see where you're coming from here.  I don't agree that this is the intended meaning"”but I think it's way 
too close for an official problem.  (On GMAC's problems, there will be one 
very clear intended meaning; other interpretations will be very clearly incorrect/unreasonable.)
When I read this sentence, I see "Pure science is concerned with the discovery of truths, not so much with applications 
of those truths".  Hence 
their, referring to the truths.
Honestly, as with every other sentence, that's just an on-the-spot reading; i.e., like other "normal" reading, it doesn't involve conscious thought to discern the meaning.
In retrospect, though, I can see at least two reasons why the pronoun should 
not refer to pure science itself:
1/ 
It's pretty clear that "pure science" 
as a whole does not have "potential uses""”it's way, way, WAY too broad.  (As an analogy, consider making a a sail in the shape of a right triangle"”a process that could serve as an application of the Pythagorean theorem.  Now consider whether you could make a shape that would be "an application of geometry" as a whole.)
2/
It doesn't make sense to say that "pure science considers the applications of pure science".  I.e., a field can't consider 
itself.
For instance, if a field involves 
applications of physics, then it's not "physics" anymore"”it's engineering, or ballistics, or pharmacokinetics, or kinesiology, or whatever other field.  And so on.
At the end of the day, though, I don't think your interpretation is 
unreasonable.  So, the problem is simply not good enough for the GMAT.
So, forget this problem"”and, for good measure, cast a suspicious eye on the source.