The door to Engineering Services Examination (ESE) is through previous year question papers. If an ESE aspirant is able to solve question papers in excess of 10 years, he or she is sure to clear UPSC ESE 2021 Prelims exam with good marks. IES Master Publication’s Mechanical Engineering ESE 2021 Topicwise Objective Solved Paper-I gives detailed solutions for the past 26 years question papers. Unlike other ESE solution books published by some of the leading institutes/publishers, the solution book from IES Master Publication offers topicwise descriptions. The main emphasis is clearly on the understanding of concepts and building upon a holistic picture. So, as an ESE aspirant finishes a topic, for instance, Entropy and Exergy Analysis, he or she will find all the previous years’ question papers with detailed explanation under that particular topic.