Complete Guide to NDA general science for GAT 2026

The General Science section in the NDA GAT paper constitutes 200 marks, covering Physics, Chemistry, and Biology. Mastery requires focusing on conceptual clarity, NCERT mastery, and consistent practice. We at Exam Bhai emphasize that scoring well here is pivotal for clearing the overall GAT cutoff and securing your SSB interview call.

What is the Exam?

The National Defence Academy (NDA) examination is a premier gateway for young aspirants to join the Indian Army, Navy, and Air Force. Conducted twice a year by the Union Public Service Commission (UPSC), the exam is divided into two papers: Mathematics and the General Ability Test (GAT).

General Science is a significant component of the GAT paper, testing a candidate's fundamental understanding of scientific principles and their day-to-day applications. As experts, we recognize that the UPSC syllabus is designed to identify candidates who possess a scientific temperament—a non-negotiable trait for future officers of the Indian Armed Forces.

Key Highlights 2026

Feature	Details
Conducting Body	UPSC
Exam Name	NDA & NA Examination
Mode of Exam	Offline (Pen and Paper)
GAT Total Marks	600
General Science Weightage	200 Marks (50 Questions)
Marking Scheme	+4 for correct, -1.33 for incorrect
Exam Frequency	Twice Yearly

Syllabus 2026

We at Exam Bhai have broken down the vast UPSC syllabus into manageable modules. The General Science portion covers three main domains:

Physics

• Properties of Matter (Solids, Liquids, Gases)
• Motion, Force, and Newton's Laws
• Work, Energy, and Power
• Optics (Reflection, Refraction, Lenses)
• Electricity and Magnetism
• Sound Waves

Chemistry

• Physical and Chemical Changes
• Elements, Mixtures, and Compounds
• Symbols, Formulae, and Equations
• Laws of Chemical Combination
• Properties of Air and Water
• Preparation and Properties of Hydrogen, Oxygen, Nitrogen, and CO2
• Acids, Bases, and Salts
• Fertilizers and Manures

Biology

• Living vs. Non-living entities
• Cell Biology (Structure and Function)
• Basics of Human Body (Systems and Nutrition)
• Common Epidemics and Prevention
• Photosynthesis and Plant Physiology

Exam Pattern

The GAT paper is bifurcated into two parts: English and General Knowledge (which includes General Science). To excel, you must understand the distribution of weightage. We recommend you practice free mock tests for Defence on Exam Bhai to simulate the real UPSC environment and manage your time effectively between the language and science sections.

Subject	Questions	Marks
Physics	~22-25	88-100
Chemistry	~12-15	48-60
Biology	~10-13	40-52
Total Science	50	200

Eligibility Criteria

Eligibility is strictly governed by the UPSC guidelines. According to the official notification available on upsc.gov.in, candidates must meet the following criteria:

• Age: Must be between 16.5 and 19.5 years at the time of commencement of the course.
• Education: Class 12th pass (Physics and Mathematics are mandatory for Air Force/Navy wings).
• Nationality: Citizen of India, subject of Nepal/Bhutan, or Tibetan refugee settled permanently since Jan 1962.
• Gender: Open to both male and female candidates as per current government regulations.

Application Process

The application process is conducted online exclusively via the official UPSC portal.

1. Visit the official website.
2. Register for an OTR (One Time Registration).
3. Fill in the detailed application form.
4. Select your preferred examination center.
5. Pay the requisite fee (exempted for SC/ST/Sons of JCOs/NCOs/ORs).
6. Take a printout of the final submitted application for your records.

Preparation Strategy

Success in NDA General Science requires more than just rote learning; it requires conceptual application. Here is our expert strategy:

• Master NCERT: Treat NCERT books (Classes 9–12) as your holy grail. 80-90% of questions are directly derived from these concepts.
• Focus on High-Weightage Topics: In Physics, prioritize Optics and Electricity. In Chemistry, focus on periodic trends and chemical bonding.
• Use Data-Driven Practice: Do not jump into solving random questions. Instead, access structured study plans for Defence on Exam Bhai to identify your weak spots.
• Revision Cycles: The human brain forgets science formulas quickly. Implement a '3-Cycle Revision' model where you revise topics at 1-day, 7-day, and 30-day intervals.
• Previous Year Papers: Analyze the last 10 years of UPSC papers to identify recurring themes and phrasing styles.
• Active Learning: Use flashcards for periodic table elements and biological nomenclature. When you attempt subject-wise quizzes for Defence on Exam Bhai, ensure you analyze every incorrect answer to understand the underlying logic.

Cut-Off Trends

The cut-off marks for NDA are determined by the UPSC based on the difficulty level of the paper and the number of vacancies. As per historical data published on upsc.gov.in, the qualifying mark for the written exam typically hovers around 350–370 out of 900.

Crucial Insight: While there is no sectional cut-off for General Science specifically, failing to score in this section makes it mathematically difficult to cross the overall GAT threshold. Recent trends show that a consistent score of 120+ in the Science section is the hallmark of a successful candidate.

Frequently Asked Questions

1. Is NCERT enough for NDA General Science?

Yes, NCERT textbooks from classes 9 to 12 form the backbone of the UPSC NDA syllabus. If you master the concepts within these books, you can solve the majority of the questions.

2. Is there a negative marking in the Science section?

Yes, every incorrect answer in the GAT paper, including the General Science section, attracts a penalty of -1.33 marks. Accuracy is more important than attempting all questions.

3. Which subject carries the most weightage in Science?

Physics consistently carries the highest weightage, often comprising about 22-25 questions out of the 50 total science questions.

4. How can I improve my speed in GAT?

Speed comes from practice. Regular timed mock tests help in identifying questions that consume too much time, allowing you to skip them and focus on easier ones first.

5. Do I need to be a Science student to score well?

No. While having a science background helps, the syllabus is designed for anyone with a strong grasp of Class 10th level science. Many humanities students excel here by following a disciplined approach.

6. What is the best way to revise Chemistry formulas?

Create a 'Cheat Sheet' with chemical symbols, common names of compounds (e.g., Baking Soda, Washing Soda), and common chemical equations. Review this sheet daily during your final month of preparation.