The Physics Olympiad for classes XI and XII usually consists of two rounds: the screening test and the main exam. Here are some details and the exam pattern for the Physics Olympiad:

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1. Screening Test:
- The screening test is usually conducted at the school level to shortlist students for the main exam.
- The screening test typically consists of multiple-choice questions (MCQs) covering various topics in physics such as mechanics, thermodynamics, electromagnetism, optics, etc.
- The duration of the screening test is usually around 1-2 hours.

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2. Main Exam:
- The main exam is conducted at the national level and is more challenging than the screening test.
- The main exam may consist of a combination of MCQs, short answer questions, and descriptive questions.
- The topics covered in the main exam are more advanced and may include topics like quantum mechanics, relativity, nuclear physics, etc.
- The duration of the main exam is usually longer than the screening test, ranging from 2-4 hours.

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Exam Pattern:
- The exam pattern may vary from year to year, but typically includes questions from various topics in physics.
- The questions may test the students' conceptual understanding, problem-solving skills, and ability to apply theoretical knowledge to real-life situations.
- Students are expected to have a good understanding of fundamental concepts in physics and be able to solve problems using mathematical equations and principles.

Overall, participating in the Physics Olympiad for classes XI and XII can be a great way for students to enhance their knowledge and skills in physics and prepare for competitive exams in the future.

The syllabus for the Physics Olympiad for classes XI and XII usually covers a wide range of topics in physics. Here is a general outline of the syllabus for the Physics Olympiad:

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Class XI:
1. Physical World and Measurement
2. Kinematics
3. Laws of Motion
4. Work, Energy, and Power
5. Motion of System of Particles and Rigid Body
6. Gravitation
7. Properties of Bulk Matter
8. Thermodynamics
9. Behavior of Perfect Gas and Kinetic Theory
10. Oscillations and Waves

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Class XII:
1. Electrostatics
2. Current Electricity
3. Magnetic Effects of Current and Magnetism
4. Electromagnetic Induction and Alternating Currents
5. Electromagnetic Waves
6. Optics
7. Dual Nature of Matter and Radiation
8. Atoms and Nuclei
9. Electronic Devices

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In addition to the above topics, students may also be required to have a good understanding of mathematical concepts such as calculus, algebra, trigonometry, and geometry as they are often used in solving physics problems.

It is important for students preparing for the Physics Olympiad to have a strong foundation in these topics and to be able to apply theoretical knowledge to solve complex problems. Practicing with previous year's question papers and participating in mock tests can help students prepare effectively for the Olympiad.