The major component in a solution is called the solute true

            False: The major component in a solution is called the Solvent.

Explanation:
                   Solutions are the Homogeneous mixtures of two or more substances. Mainly the components are divided into two catogories

           1) Solvent:
                            The component which is the major or which is present in large amount is called solvent.

Example:  In water salt solution water is the solvent.

            2) Solute:
                           The component which is the minor or which is present in less amount is called solute.

Example:  In water salt solution salt is the solute.

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.