There is some confusion whether an aptitude is innate or inborn or an acquired capacity. For example the scholastic aptitude is highly oriented to the types of abilities learned in formal schooling with an emphasis on verbal and mathematical abilities probably, it is impossible to measure exactly the mental abilities because these are too complex to be measured directly and adequately. It is obvious that achievement tests measure what a people has learned and aptitude tests measure the ability to learn new tasks. According to Wiersma (1986: p. 302),” the development of an aptitude test is a difficult task that requires a good deal of information, effort and measurement exercise. For this reason aptitude tests are seldom self -constructed for a research project. There are numerous aptitude tests available for both general and specific aptitude.” Khan (1992, p29) quoted the work done in Pakistan as, “Limited work in this area had been done in different institutions and universities of Pakistan. Mainly the emphasis has been on achievement and intelligence tests. In 1960-61 group scholastic aptitude test for class 10th, 11th and adults was adopted from California test of mental maturity by Amina Talib and Ghulam Hussain, which suit Pakistani culture. In 1972, IER, University of the Punjab, Lahore standardized three scales of scholastic aptitude test for children from class three through class X. Later on in 1984 Naheed Khurshid worked on the Development of Science Aptitude test.”