The present book ‘Objective Environmental Sciences’, in objective MCQ-format, has been specially developed keeping in mind the requirements of students, exam-aspirants and other readers with academic as well as competitions’ point of view. The book is especially useful for the aspirants of various competitive exams where this subject forms an essential part of the selection criteria. The main aim of the book is to present this specialised subject in an objective and reader-friendly manner to make the readers study and practice numerous questions on its various topics thoroughly which are solved by expert. The book comprises a wide spectrum of question-answers in MCQ form, covering all important topics and frequently asked in various exams. The book will act as an efficient tool to test your knowledge of the subject and preparation of exam. The book will definitely prove to be a boon to the inquisitive students, exam-aspirants, and other readers in improving and enhancing their knowledge of the subject and will immensely help them perform better in their respective exams and competitions. The book is highly recommended for self-practice of objective questions on the subject and to sharpen your problem-solving skills to a great-extent.