- Familiarize yourself with the fundamental principles and theories of nuclear chemistry and radioactivity.
- Learn about key topics such as nuclear reactions, radioactive decay, half-life, nuclear binding energy, and isotopes.


- Carefully go through the UPSC Chemistry Optional syllabus to identify the specific areas related to nuclear chemistry and radioactivity.
- Make a list of the important subtopics and concepts that you need to focus on for answering questions effectively.


- Solve previous year question papers to get an idea of the type of questions asked in the exam.
- Analyze the pattern of questions related to nuclear chemistry and radioactivity to understand the areas that are frequently covered.


- Develop a study plan that allocates sufficient time for each subtopic within nuclear chemistry and radioactivity.
- Divide your study sessions into smaller, manageable chunks to enhance comprehension and retention of the material.


- Utilize diagrams, flowcharts, and illustrations to explain complex concepts related to nuclear chemistry and radioactivity.
- Provide real-life examples or case studies to support your answers and demonstrate a practical understanding of the subject.


- Solve numerical problems related to radioactivity, half-life, and nuclear reactions to strengthen your problem-solving skills.
- Pay attention to units and calculations during practice to avoid errors in the actual exam.


- Keep yourself updated with recent advancements and discoveries in the field of nuclear chemistry and radioactivity.
- Read scientific journals, research papers, and news articles to gain additional knowledge and insights.


- Allocate appropriate time to each question based on its difficulty level and marks assigned.
- Prioritize questions that you are confident about and save the more challenging ones for later, ensuring that you have enough time to attempt them.


- Regularly revise the concepts, formulas, and key points related to nuclear chemistry and radioactivity.
- Practice mock tests and sample papers to improve your speed, accuracy, and overall performance.

By following these strategies, you can effectively answer questions on nuclear chemistry and radioactivity in Paper I of the UPSC Chemistry Optional subject. Remember to focus on understanding the concepts, practicing with relevant examples and numerical problems, and staying updated with the latest developments in the field.