Revision in Science Class X has been revised strictly as per the revised syllabus and examination pattern of CBSE. In the process of revision, a major portion of the text has been rewritten, retaining the salient features of the previous editions. In this edition, the questions have been systematically categorised to address different cognitive levels, focusing on essential skills such as Remembering, Understanding, Applying, Analyzing, Evaluating, and Creating. Thequestions are designed to enhance competency-based learning and are presented in a variety of formats.