The book presents a study which aims to find whether health drink advertisements are effective in children i.e., does watching health drink advertisements result in children buying the product? A random sample of 250 students, both boys and girls, rated ‘Effectiveness of Health Drink Advertisements'' on a 5-point rating scale and a standard questionnaire for locus of control measure on a 7-point rating scale. Statistical tools like Chi-Square, t-test, percentile analysis, correlation, mean and standard deviation were used for analysing the data. The result reveals effectiveness of health drink advertisements on children and falls in the ‘Good Advertisement'' category. Very low degree of positive correlation between effectiveness of health drink advertisements and locus of control is seen. The result also reveals external locus of control existing in the respondents.