A large number of objective (MCQs with explanation) and subjective questions and answers are presented in this book. Semester questions from different Universities are also presented topic wise. This will help students to improve their practice for both online and offline examinations. Every chapter is ended with some exercise questions to help students in evaluating their understanding of the subject. Every care has been taken to eliminate misprints and errors. Still the authors would be grateful to the readers for bringing to their notice any such errors/misprints while going through the book.