hii Sowmya,

For entrance question paper for M.Sc. biotechnology in madras university , you need to visit - https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.indiastudycenter.com/Other/Syllabus/MADUNIV/Post-Graduate-Courses/MSc-Biotechnology/default.asp&ved=2ahUKEwiU8tqVj8bjAhUE63MBHW7xCeMQFjABegQICRAC&usg=AOvVaw2zHB9xVk0DLBN8ZtyxLyrT

hope it help!!