competitive examinations conducted by Public Sector Undertakings (PSUs) in India, primarily targeting candidates with a strong research background, often seeking engineers and scientists for roles focused on research and development within their respective industries, including areas like aerospace, nuclear energy, and oil & gas exploration; prominent examples include exams held by ISRO (Indian Space Research Organisation), BARC (Bhabha Atomic Research Centre), and ONGC (Oil and Natural Gas Corporation) to recruit researchers and technical specialists.