Book excerpt: The Self-practice books in Science for Classes 9 and 10 is a series of six practice books that have been specially crafted as a supplement to the S. Chand Science main textbooks. These practice books have been designed to test quick and easy assessment of learning progress.Relevant questions of the main textbook have been given with adequate writing space for practice. The books in this series, enriched with the following features, will help in learning techniques, managing time and sticking to word limit while writing answers.