How is 'aptitude' different from 'interest' and intelligence?

Aptitude:

(i) Aptitude refers to combination of characterstics indicative of an individual's potential to acquire some specific skills with training.

(ii) It is specific mental ability or teach ability of an individual to learn a particular skill.

(iii) It is the potentiality to perform a particular activity.

(iv) Aptitude is a determiner to learn a particular skill.

Interest:

(i) Interest refers to preference for a particular activity or what one enjoys doing.

(ii) Interest are acquired/learnt.

(iii) Interest is a facilitator.

An individual with high scientific aptitude having strong interest in mechanical activities is more likely to be successful mechanical engineer.

(i) Intelligence is a global and aggregate capacity of an individual to think rationally, act purposefully and to deal effectively with her/his environment.

(ii) Intelligence is a general mental ability.

(iii) It is product of heredity and environment.

(iv) It does not require training for the growth.