PREFACE The Department of Education in Science and Mathematics (DESM), National Council of Educational Research and Training (NCERT),INDIA, initiated the development of ‘Exemplar Problems’ in science and mathematics for secondary and higher secondary stages after completing the preparation of textbooks based on National Curriculum Framework – 2005. The main objective of the book on ‘Exemplar Problems in Physics’ is to provide the teachers and students a large number of quality problems with varying cognitive levels to facilitate teaching-learning of concepts in physics that are presented through the textbook for Class XI. It is envisaged that the problems included in this volume would help the teachers to design tasks to assess effectiveness of their teaching and to know about the achievement of their students besides facilitating preparation of balanced question papers for unit and terminal tests. The feedback based on the analysis of students’ responses may help the teachers in further improving the quality of classroom instructions. In addition, the problems given in this book are also expected to help the teachers to perceive the basic characteristics of good quality questions and motivate them to frame similar questions on their own. Students can benefit themselves by attempting the exercises given in the book for self assessment and also in mastering the basic techniques of problem solving. Some of the questions given in the book are expected to challenge the understanding of the concepts of physics of the students and their ability to apply them in novel situations.
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