In this study, attempt to construct STEM pedagogy-based learning activities in physics for enhancing interdisciplinary approach at the secondary level. The study evaluates the effectiveness of STEM pedagogy-based learning activities in physics. To examine the effectiveness of this model, 98 students were chosen for the study. It was determined through the use of appropriate statistical techniques that the data was analysed in order to examine the significance of hypotheses formulated within this context. For the analysis of data, the major statistical techniques are the computation of the coefficient of correlation, the critical ratio, the, and the analysis of covariance (ANCOVA). During the course of the research, it was found that significant differences exist between the experimental and control groups with regards to the posttest scores of STEM pedagogy-based learning activities in physics at secondary level