Marking Scheme for NDA Exam Papers:

The NDA (National Defence Academy) exam is conducted by the Union Public Service Commission (UPSC) to select candidates for admission into the Indian Army, Navy, and Air Force. The exam consists of two papers - Mathematics and General Ability Test (GAT). Let's discuss the marking scheme for each paper in detail:

1. Mathematics Paper:
The Mathematics paper in the NDA exam is designed to test the mathematical aptitude of the candidates. It consists of multiple-choice questions (MCQs) from various topics such as algebra, trigonometry, calculus, geometry, statistics, etc. The marking scheme for the Mathematics paper is as follows:

- Total Marks: The Mathematics paper carries a total of 300 marks.
- Number of Questions: The paper consists of 120 questions.
- Marking Scheme: Each correct answer carries 2.5 marks.
- Negative Marking: There is a negative marking of 0.83 marks for each incorrect answer.
- Unanswered Questions: No marks are deducted for unanswered questions.

The formula to calculate the score for the Mathematics paper is as follows:
Score = (Number of Correct Answers x 2.5) - (Number of Incorrect Answers x 0.83)

2. General Ability Test (GAT) Paper:
The GAT paper in the NDA exam is divided into two sections - English and General Knowledge. It consists of objective-type questions to assess the general awareness, English language skills, and reasoning ability of the candidates. The marking scheme for the GAT paper is as follows:

- Total Marks: The GAT paper carries a total of 600 marks.
- Number of Questions: The paper consists of 150 questions.
- Marking Scheme: Each correct answer carries 4 marks.
- Negative Marking: There is a negative marking of 1.33 marks for each incorrect answer.
- Unanswered Questions: No marks are deducted for unanswered questions.

The formula to calculate the score for the GAT paper is as follows:
Score = (Number of Correct Answers x 4) - (Number of Incorrect Answers x 1.33)

Overall, the NDA exam is a highly competitive exam, and it is important for candidates to prepare thoroughly for both the Mathematics and GAT papers. It is advised to practice previous year question papers and mock tests to familiarize oneself with the exam pattern and improve time management skills.