Fluid intelligence is defined as novel reasoning and the efficiency of solving new problems or responding to abstract ideas. It is defined also as the ability to perceive relationships and solve relational problems of the type that are not taught and are relatively free of cultural influences. Moreover, Fluid intelligence refer to abilities that make a person a flexible and adaptive thinker, that allow him/her to draw inferences, and that allow him/her to understand the relations among concepts independent of acquired knowledge and experience.