Calculation of Score with Negative Marking in IIT JAM Chemistry Exam

Negative marking is a crucial aspect of the IIT JAM Chemistry exam, which is conducted to evaluate the knowledge and understanding of candidates in the field of chemistry. In this type of examination, marks are deducted for incorrect answers, which makes it essential for candidates to have a clear understanding of the scoring system. Here is a detailed explanation of how the score is calculated in the IIT JAM Chemistry exam with negative marking:

1. Marking Scheme:
- The IIT JAM Chemistry exam consists of multiple-choice questions (MCQs), and each question carries either 1 or 2 marks.
- For each correct answer, candidates are awarded full marks as per the weightage of the question.
- For every incorrect answer in the 1-mark questions, 1/3rd of the total marks assigned to that question are deducted.
- For each incorrect response in the 2-mark questions, 2/3rd of the total marks assigned to that question are deducted.
- No marks are deducted for unattempted questions or questions that are left blank.

2. Calculation Process:
- Firstly, calculate the total number of correct answers and the total number of incorrect answers.
- Multiply the number of correct answers with the marks assigned to each question to get the total marks obtained for the correct responses.
- Multiply the number of incorrect answers for 1-mark questions with the negative marking factor of 1/3 and multiply the number of incorrect answers for 2-mark questions with the negative marking factor of 2/3.
- Subtract the marks obtained from incorrect responses from the total marks obtained from correct responses to get the net score.

3. Example:
Let's consider an example to understand the calculation process better. Suppose a candidate attempted 60 questions in the IIT JAM Chemistry exam, out of which 40 were correct and 20 were incorrect. The marking scheme is as follows:
- 1-mark questions: +1 for correct and -1/3 for incorrect.
- 2-mark questions: +2 for correct and -2/3 for incorrect.

- Number of correct answers: 40
- Number of incorrect answers: 20

Calculation:
- Total marks obtained from correct responses: 40 x 1 + 0 x 2 = 40
- Marks deducted for incorrect responses: (20 x 1/3) + (0 x 2/3) = 20/3
- Net score: 40 - 20/3 ≈ 33.33

Therefore, based on this example, the net score for the candidate would be approximately 33.33.

In conclusion, the calculation of the score in the IIT JAM Chemistry exam with negative marking involves determining the number of correct and incorrect responses, applying the appropriate negative marking factors, and subtracting the marks deducted from the total marks obtained to obtain the net score. It is crucial for candidates to understand the marking scheme and prepare accordingly to maximize their score in the examination.