Hello Mahekbanu,

The Syllabus for most PG Entrance Exams for Dietician consist of many topics/subjects - Nutrition, Bio-Chemistry, Physiology and Microbiology. For the registered dietician exam the syllabus for both the papers include - Human Physiology, Physiologic and Metabolic Changes in Disease, Food Microbiology, Sanitation and Hygiene, Human Nutrition and Meal Management, Community Nutrition, Diet Therapy (Theory), Nutrition Education and Dietetic Counseling, Food Services Management. 

Hope that helps and feel free to ask if you have any more queries. Best of luck!