The passage broadly talks about the difference between purse science and applied science, i.e. engineering. Further the author says that engineers might find even those theories of physics useful that from the point of view of pure physics are false. Option 4 precisely captures that. It says that engineering incorporates the constraints and conditions of physics in the real world. Option 2 says the relationship is strictly linear, but that is not the case. Had that been the case, the false theories of pure science could not have been used by engineers for accurate predictions. Option 3 gives a summary that is totally different from the what the passage discusses.