Changes in the Marking Scheme for Numerical Answer Type (NAT) Questions

Introduction:
Numerical Answer Type (NAT) questions are a type of questions where candidates have to enter a numerical value as an answer instead of choosing from multiple options. These questions require candidates to solve problems and provide the correct numerical answer. The marking scheme for NAT questions has undergone certain changes to ensure fairness and accuracy in the evaluation process.

Changes in the Marking Scheme:

1. No Negative Marking: Unlike multiple-choice questions, NAT questions do not have negative marking. This means that candidates will not lose any marks for incorrect answers. Only the correct answers will be awarded marks, while incorrect or blank responses will receive zero marks.

2. Precision of Answer: In NAT questions, the precision of the answer plays a crucial role in determining the marks awarded. The marking scheme defines the acceptable range of values for the answer, and marks are awarded if the candidate's response falls within this range. However, the precision may vary depending on the question and its complexity.

3. Decimal Places: In some cases, the marking scheme may specify the required number of decimal places for the answer. If the candidate's response matches the specified decimal places, full marks are awarded. However, partial marks may be granted if the response is correct but has a different number of decimal places.

4. Units: NAT questions often require candidates to provide answers with appropriate units. The marking scheme may specify the required unit for the answer, and marks are awarded only if the candidate includes the correct unit along with the numerical value. Omitting or using the wrong unit may result in zero marks.

5. Range of Acceptable Answers: In some cases, the marking scheme may define a range of acceptable answers instead of a single numerical value. If the candidate's response falls within this range, full marks are awarded. However, partial marks may be given if the response is close to the correct answer but falls outside the defined range.

6. Feedback: To enhance the transparency of the evaluation process, some examination authorities provide feedback to the candidates regarding the marking scheme for NAT questions. This feedback may include the expected answer, acceptable range, required decimal places, and units. It helps candidates understand the evaluation criteria and improve their performance in future exams.

Conclusion:
The marking scheme for Numerical Answer Type (NAT) questions has evolved to ensure fairness and accuracy in evaluating candidates' responses. These changes, such as the absence of negative marking, consideration of precision and decimal places, inclusion of units, and acceptance of a range of answers, aim to provide a comprehensive evaluation of candidates' problem-solving skills. Candidates should familiarize themselves with the specific marking scheme provided by the examination authorities to maximize their performance in NAT questions.