What is the sequence of processes in Otto Cycle?

A previous-year question is not merely a test item; it is a distilled worked example of MPSC's own difficulty calibration. Treat every question you open on this site as a three-layer artefact. The first layer is the immediate answer — get it right or wrong. The second layer is the option-elimination logic — for each of the three wrong options, articulate in one sentence why it is wrong. The third layer is the concept generalisation — what pattern of question does this belong to, and where else might the same concept surface in the paper?

For MPSC-specific pattern generalisation, our editorial team categorises every PYQ into a subject and a topic. Once you are consistently strong on a topic, use the Topic Wise practice mode to move to an unseen quiz on the same topic and then a mock. That progression — PYQ → same-topic unseen → mixed mock — is the single most reliable curriculum path we have observed in three years of user data.

Finally, the explanation below is our editorial team's compact reasoning for the correct answer. If it is missing or brief, the question is often one where the answer is self-evident from the option text; if it is longer, the question typically involves a factual anchor (date, article, place, formula) that we surface for quick memorisation.