Introduction:
The IIT JAM (Joint Admission Test for M.Sc.) Physics Exam is a highly competitive examination conducted for admission to postgraduate physics programs offered by the Indian Institutes of Technology (IITs) and other institutes. It is essential for candidates to have a clear understanding of the marking scheme to effectively prepare for the exam.

Negative Marking:
Yes, there is negative marking for incorrect answers in the IIT JAM Physics Exam. It is important for candidates to be cautious while attempting the questions as each incorrect answer attracts a penalty.

Marking Scheme:
The marking scheme for the IIT JAM Physics Exam is as follows:

1. Multiple Choice Questions (MCQs):
- Each correct answer carries 1 or 2 marks depending on the question.
- For 1-mark questions, 1/3 marks are deducted for every incorrect answer.
- For 2-mark questions, 2/3 marks are deducted for every incorrect answer.
- Unanswered questions do not have any negative marking.

2. Multiple Select Questions (MSQs):
- Each correct answer carries 2 marks.
- There is no negative marking for MSQs.
- Unanswered questions do not have any negative marking.

3. Numerical Answer Type (NAT) Questions:
- Each correct answer carries 1 or 2 marks depending on the question.
- There is no negative marking for NAT questions.
- Unanswered questions do not have any negative marking.

Strategy:
Considering the negative marking, candidates should adopt a strategic approach while attempting the IIT JAM Physics Exam. Here are a few tips:

1. Accuracy over Guesswork:
- Candidates should focus on answering questions they are confident about, rather than randomly guessing.
- Attempting questions without proper understanding may lead to negative marking and reduce overall score.

2. Time Management:
- It is crucial to manage time effectively during the exam.
- Candidates should allocate time for each section and try to complete the easier questions first to maximize their score.

3. Practice and Revision:
- Regular practice and revision of concepts, formulas, and problem-solving techniques are essential.
- Solving previous year question papers and mock tests can help candidates familiarize themselves with the exam pattern and improve their accuracy.

Conclusion:
In the IIT JAM Physics Exam, there is negative marking for incorrect answers in the MCQs. However, there is no negative marking for MSQs and NAT questions. Candidates should approach the exam with careful consideration of the marking scheme and adopt a strategic approach to maximize their score while minimizing negative marking. Regular practice, time management, and revision are key to achieving success in the exam.