Marking Scheme for Numerical Answer Type (NAT) Questions in IIT JAM Mathematics Exam

Numerical Answer Type (NAT) questions are a type of objective questions in the IIT JAM (Joint Admission Test for M.Sc.) Mathematics Exam. In NAT questions, candidates are required to enter the numerical value of the answer using the virtual numeric keypad provided on the screen. The marking scheme for NAT questions in the IIT JAM Mathematics Exam is as follows:

+1 Mark for Correct Answer:
- If the entered numerical value is accurate and matches the correct answer, the candidate is awarded 1 mark.
- The answer is expected to be precise and with the correct number of decimal places (if applicable).
- No negative marking is applicable for incorrect answers in NAT questions.

No Partial Marks:
- Unlike multiple-choice questions where partial marks can be awarded for selecting some correct options, NAT questions do not have partial marking.
- The answer must be entirely correct to receive the full 1 mark.

Decimal Approximation:
- In some cases, the question may require the answer to be given in decimal approximation.
- If the question specifies the number of decimal places, the candidate must provide the answer accordingly to receive full marks.
- If the question does not specify the number of decimal places, the answer is expected to be accurate to at least two decimal places.

Scientific Notation:
- If the answer is in scientific notation, the candidate must enter the answer in standard scientific notation format.
- The use of 'E' or 'e' to denote the exponent is accepted, e.g., 1.23E+04 or 1.23e+04.
- The numerical value and the exponent must be accurate to receive full marks.

Unit of Measurement:
- If the question requires the answer to have a specific unit of measurement, the candidate must enter the numerical value along with the appropriate unit.
- The unit should be written according to the standard abbreviations or symbols used for that particular unit.
- Omitting or incorrectly specifying the unit may result in the answer being marked as incorrect.

Final Remarks:
- It is important to carefully read and understand the question requirements before attempting to answer NAT questions.
- Double-checking the answer for accuracy, precision, decimal places, and units can help avoid mistakes and maximize the chances of scoring full marks.
- Practicing with previous years' question papers and mock tests can be beneficial in familiarizing oneself with the answering format and improving accuracy.

In conclusion, NAT questions in the IIT JAM Mathematics Exam are marked based on the accuracy and precision of the numerical answer entered by the candidate. Attention to detail, proper decimal approximation, scientific notation, and correct units of measurement are essential to score full marks in these questions.