This K.C.S.E Revision physics is designed to enable the Physics student make a rapid revision of the subject matter normally included in the KCSE Examination. The questions have been well selected and arranged in a topical order to illustrate the basic principles involved in a given topic. The book is expected to motivate and prepare the learner to acquire basic skills in answering questions. The questions and answers have been used successfully for quick revision by the teachers. They guide the students fact by fact and act as a source of information to candidates. The book is recommended for use by all students in form '1 & 4. Students studying for examination will find this book a good revision companion in physics