Introduction:
The marking scheme for the IIT JAM Physics exam may vary from year to year. It is important to note that the organizing institute has the authority to determine the marking scheme for each edition of the exam. While there may be some similarities in the marking scheme across different years, it is not guaranteed to remain the same. It is advisable to refer to the official website or notification of the respective year's exam to get accurate information about the marking scheme.

Factors influencing the marking scheme:
The marking scheme for the IIT JAM Physics exam is influenced by various factors, including:

1. Difficulty level of the paper: The organizing institute takes into consideration the difficulty level of the paper while determining the marking scheme. If the paper is relatively easier, the marking scheme may be more stringent to differentiate students based on their performance.

2. Number of candidates appearing: The number of candidates appearing for the exam also plays a role in determining the marking scheme. If there is a large number of candidates, the marking scheme may be designed to distribute marks across a wider range to ensure fair evaluation.

3. Nature of the questions: The nature of the questions asked in the exam also affects the marking scheme. If the questions are conceptual and require in-depth understanding, the marking scheme may give more weightage to conceptual clarity rather than rote memorization.

4. Previous year's performance: The organizing institute may also consider the performance of candidates in the previous year's exam while deciding the marking scheme. If there were any anomalies or issues with the previous year's marking scheme, adjustments may be made accordingly.

Conclusion:
In conclusion, while there may be some similarities in the marking scheme for the IIT JAM Physics exam across different years, it is not guaranteed to remain the same. The marking scheme is determined by the organizing institute based on various factors such as the difficulty level of the paper, number of candidates, nature of questions, and previous year's performance. It is important for candidates to refer to the official website or notification of the respective year's exam for accurate information about the marking scheme.