First round is a written test which consists of 4 sections they don't mention aptitude in invitation but first section is aptitude 10 qstns and digital electronics 10 qstns c programming 10 qstns electrical 10 qstns generic 50 questions which will not have choices it is a technical one based on circuit theory. The exam is like a semester exam i don't know why do they expect freshers to know much i bet the employees there will not pass that exam