The third and fifth ones. They are relying on the ability of the search engine to understand human-like requirements. For any search engine, it should be easier to find a definition of a simple word, however, they are asking the whole question in order to obtain a more precise answer, maybe from a website that contains a similar question that has already been asked before.
Third and fifth students query the engine looking for a more specific answer that can fit their needs, so they don't have to do the analysis of information, just directly get the answer they need.
