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2. Let us sum up the passage. The passage states that physics seeks to understand the behavior of matter without regard to whether it will afford any practical benefit while engineering uses the theories of physics for some specific use. Secondly, in real world situations, engineers often use theories from physics that have been rejected under controlled experimental situations.
Option 1 is an assumption that is not borne out by the passage. The passage does state that theories of physics or pure sciences do direct applied sciences such as engineering but we do not know whether or not the reverse is true. Thus, option 1 is eliminated.
Option 2 summarizes the paragraph succinctly. It restates the meanings given in summing up the passage. Though engineering uses a lot of theories of physics it also accepts a lot of theories rejected by physicists that have been created in controlled experimental situations because they happen to work in real world situations.
Option 3 erroneously refers to “design constraints” instead of the “acceptance and rejections of theories of pure science.” The paragraph does not mention “design constraints” at all but the fact that engineers frequently use theories of physics that have been rejected in controlled experimental situations. Thus, option 3 is eliminated.
Option 4 distorts the meaning of the paragraph. Engineering and physics do not fundamentally differ on matters like building a bridge or a nuclear reactor. The paragraph states in sentence 2 that engineers use the theories of physics to build bridges and nuclear reactors. It is just that some theories of physics which have been rejected in controlled experimental situations are put into use by engineers in real world situations but fundamentally engineers use the theories of physics and do not differ from them.
Hence, the correct answer is option 2.