Railway Physics Chemistry B is an Android application developed by The Knowledge Express, a free educational and reference app. This app is designed specifically for railway exam aspirants who want to sharpen their skills in Physics, Chemistry and Biology. It contains a vast collection of over 1350 objective previous year's questions in Physics, 1100+ questions in Chemistry, and 1450+ questions in Biology from different railway exams.

The app has an easy-to-use interface that allows users to navigate through different topics effortlessly. The questions are organized subject-wise and chapter-wise, making it easier for users to select the topics they want to study. The app's objective is to help users prepare for railway exams by providing them with a comprehensive collection of questions that cover various topics in Physics, Chemistry, and Biology.