The viva-voce examination on the Ph. D thesis entitled “EFFECT OF PERCEIVED NOISE ON MENTAL HEALTH AMONG THE METROPOLITAN CITY DWELLERS OF BANGLADESH”  was defended by Pramath Chandra Sarker held on December 22, 2025 at 12:30 pm at the office of Director, Institute of Environmental Science, University of Rajshahi, Rajshahi-6206, Bangladesh. Principal Supervisor Professor Dr. Sabina Sultana, Department of Psychology , University of Rajshahi, Co-Supervisor Professor Dr. Md. Nur-E-Alam Siddique, Department of Psychology, University of Rajshahi.