Yes, solving previous year question papers during revision for UPSC Physics Optional is highly recommended. Here are the reasons why:

1. Familiarity with Exam Pattern:
- Solving previous year question papers helps you become familiar with the exam pattern of UPSC Physics Optional.
- You can understand the types of questions asked, the distribution of marks, and the time constraints involved.
- This familiarity will help you plan your exam strategy and allocate time accordingly.

2. Practice Under Exam-like Conditions:
- Solving previous year papers allows you to practice under exam-like conditions, helping you manage your time effectively during the actual exam.
- It helps you develop the ability to solve questions quickly and accurately, which is crucial during the limited time provided in the exam.

3. Identify Important Topics:
- Going through previous year papers will give you an idea of the important topics in the syllabus.
- You can identify recurring themes and topics that carry more weightage in the exam.
- This knowledge will help you prioritize your revision and focus on the areas that are more likely to be asked in the exam.

4. Gauge Your Preparation Level:
- Solving previous year papers allows you to assess your preparation level and identify areas where you need more practice.
- You can compare your answers with the model answers provided in the papers and identify your strengths and weaknesses.
- This self-assessment will help you make necessary improvements and work on your weak areas.

5. Boost Confidence:
- By solving previous year papers and scoring well, you will gain confidence in your preparation.
- It will assure you that you are on the right track and motivate you to perform better in the actual exam.

6. Understand Question-Answering Techniques:
- Previous year papers provide insight into the question-answer format followed by UPSC.
- You can understand the approach required to answer different types of questions, such as numerical problems, theoretical concepts, and application-based questions.
- This understanding will help you structure your answers effectively and maximize your chances of scoring well.

In conclusion, solving previous year question papers during revision for UPSC Physics Optional is an essential part of your preparation strategy. It helps you become familiar with the exam pattern, practice under exam-like conditions, identify important topics, gauge your preparation level, boost your confidence, and understand question-answering techniques. Make sure to allocate sufficient time for solving previous year papers and use them as a tool to enhance your overall performance in the exam.