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Claim Free Beta AccessMastering the NDA physics important formulas list is the ultimate key to cracking the General Ability Test (GAT) paper with high accuracy, saving precious minutes during the UPSC National Defence Academy exam through direct formula application, conceptual shortcuts, and systematic numerical problem-solving.
Welcome to ExamBhai. If your ambition is to wear the uniform and join the elite ranks of the Indian Armed Forces through the National Defence Academy (NDA) examination, mastering General Science—specifically Physics—is non-negotiable. Physics forms a substantial chunk of the GAT paper, carrying high-scoring weightage that can easily elevate your overall merit score. At ExamBhai, we have analyzed years of UPSC trends to compile this definitive guide and formula repository for NDA aspirants.
What is the Exam?
The National Defence Academy (NDA) Examination is a national-level competitive test conducted twice a year by the Union Public Service Commission (UPSC). It serves as the gateway for young, unmarried male and female candidates seeking admission to the Army, Navy, and Air Force wings of the NDA, as well as the Indian Naval Academy Course (INAC).
The selection process evaluates a candidate's mental sharpness, physical endurance, academic aptitude, and leadership potential through a rigorous written examination followed by the Service Selection Board (SSB) interview. Physics, as a core component of Part B (General Science) of the GAT paper, tests a candidate's fundamental understanding of physical laws, real-world phenomena, and basic mathematical modeling of physical systems.
Key Highlights 2026
To plan your preparation effectively, you must stay updated with the vital parameters of the NDA 2026 examination cycle:
- Conducting Body: Union Public Service Commission (UPSC)
- Frequency: Twice a year (NDA I and NDA II)
- Stages of Selection: Written Examination and SSB Interview
- Total Marks (Written): 900 Marks (Mathematics: 300, GAT: 600)
- Physics Weightage: Approximately 100 Marks within the GAT paper (around 25 questions)
- Marking Scheme: Correct answers fetch +4 marks (Maths) and +4 marks (GAT), while incorrect answers attract a negative penalty of (-1.33) marks.
- Language Medium: Bilingual (English and Hindi)
Syllabus 2026
The UPSC outlines a comprehensive physics syllabus in its official notification. Below is the structured breakdown of topics along with the critical physics formulas you must memorize:
| Unit / Topic | Core Concepts & Sub-topics | Key Formulas & Expressions |
|---|---|---|
| Mechanics | Kinematics, Laws of Motion, Work, Energy, Power, Gravitation | (v = u + at), (s = ut + \frac{1}{2}at^2), (F = ma), (KE = \frac{1}{2}mv^2), (PE = mgh), (F = \frac{Gm_1m_2}{r^2}) |
| Properties of Matter | Elasticity, Surface Tension, Viscosity, Pascal's Law, Archimedes' Principle | (Y = \frac{FL}{A\Delta L}), (P = \frac{F}{A} = \varrho gh), (F_b = V\varrho g), (v_t = \frac{2r^2(\varrho - \sigma)g}{9\eta}) |
| Heat & Thermodynamics | Temperature scales, Calorimetry, Laws of Thermodynamics, Conduction, Convection, Radiation | (Q = mc\Delta T), (PV = nRT), (\Delta U = Q - W), (Q = \frac{KA(T_1 - T_2)t}{d}) |
| Optics | Reflection, Refraction, Lenses, Mirrors, Optical Instruments, Dispersion | (\frac{1}{f} = \frac{1}{v} + \frac{1}{u}), (m = -\frac{v}{u} = \frac{h_2}{h_1}), (n = \frac{\sin i}{\sin r}), (\frac{1}{f} = (n-1)(\frac{1}{R_1} - \frac{1}{R_2})) |
| Electricity & Magnetism | Current Electricity, Ohm's Law, Resistance, Magnetic Effects of Current, Electromagnetic Induction | (V = IR), (R = \frac{\varrho L}{A}), (P = VI = I^2R = \frac{V^2}{R}), (F = qvB\sin\theta), (B = \frac{\mu_0 I}{2\pi r}) |
| Waves & Sound | Wave motion, Frequency, Wavelength, Doppler Effect, Resonance | (v = f\lambda), (T = \frac{1}{f}), (v = \sqrt{\frac{\gamma P}{\varrho}}|, (f' = f(\frac{v \pm v_o}{v \mp v_s})) |
| Modern Physics | Dual nature of matter, Photoelectric effect, Atomic structure, Radioactivity | (E = hf), (\lambda = \frac{h}{p}), (N = N_0 e^{-\lambda t}), (T_{1/2} = \frac{0.693}{\lambda}) |
Exam Pattern
The written examination consists of two papers administered on the same day. Understanding the weightage helps you allocate time between Mathematics and GAT.
| Paper Name | Subject Code | Duration | Total Marks |
|---|---|---|---|
| Paper I | Mathematics | 2.5 Hours | 300 |
| Paper II | General Ability Test (GAT) | 2.5 Hours | 600 |
Within the 600-mark GAT paper, English carries 200 marks, while General Knowledge carries 400 marks. General Knowledge is further split into Physics, Chemistry, General Science, History, Geography, and Current Events. Physics alone accounts for roughly 25 to 30 questions, making it one of the highest-yielding individual subject blocks in GAT. To build absolute mastery over this exam pattern, you should practice free mock tests for Defence on ExamBhai to simulate real exam pressure and timing.
Eligibility Criteria
According to official guidelines published on the UPSC official portal (upsc.gov.in), candidates must fulfill strict criteria to apply for the NDA examination:
- Nationality: Must be an Indian citizen, a subject of Bhutan, Nepal, or a Tibetan refugee who came over to India before January 1, 1962, with the intention of permanently settling.
- Age Limit: Unmarried male and female candidates born between specific notified dates (typically aged 16.5 to 19.5 years) are eligible.
- Educational Qualification:
- For Army Wing: 12th Class pass of the 10+2 pattern of school education or equivalent examination conducted by a State Education Board or a University.
- For Air Force and Naval Wings and 10+2 Cadet Entry Scheme: 12th Class pass with Physics, Chemistry, and Mathematics of the 10+2 pattern or equivalent.
- Physical Standards: Candidates must be physically fit according to guidelines specified by the official governing bodies.
Application Process
The application process is entirely online and managed through the official UPSC portal. Follow these sequential steps:
- Visit the official UPSC website at upsc.gov.in or upsconline.nic.in.
- Complete One-Time Registration (OTR) by providing basic personal, educational, and contact details.
- Log in using your credentials and select the active NDA Examination notification.
- Fill in your preferred service choices (Army, Navy, Air Force, Naval Academy) and exam center preferences.
- Upload scanned copies of your recent passport-sized photograph and signature adhering to specified pixel and dimension guidelines.
- Pay the prescribed application fee (fee-exempt for female candidates and SC/ST candidates) via online net banking, UPI, or credit/debit cards.
- Review your application thoroughly and click final submit. Download and print the confirmation page for future reference.
Preparation Strategy
Cracking NDA physics requires conceptual clarity rather than rote memorization. UPSC frequently designs conceptual questions based on everyday physical applications rather than complex multi-step derivations. Here is a proven strategy crafted by our experts at ExamBhai:
- Core Concept Building: Start by reading standard NCERT textbooks for Class 11 and Class 12 Physics. Focus heavily on mechanics, current electricity, and optics as they constitute over 60% of physics questions.
- Formula Notebook Maintenance: Create a dedicated pocket notebook containing all vital physics formulas, dimensional formulas, and SI units. Revise this list every morning.
- Targeted Numerical Practice: Although NDA physics leans towards theory and conceptual understanding, numerical questions on kinematics, work-energy theorem, and Ohm's law appear regularly. Ensure you practice calculation shortcuts.
- Previous Years' Question Analysis: Solve the last 10 years of NDA papers to identify recurring themes, such as convex/concave mirror ray properties or electromagnetic induction rules.
- Simulated Mock Testing: Time management is crucial in the GAT paper. You can enhance your speed and accuracy by taking timed sectional tests when you practice previous year questions for Defence on ExamBhai. Regular evaluation helps eliminate negative marking habits.
- Conceptual Revision Loops: Dedicate weekends to revising optics diagrams and thermodynamic cycles. If you ever feel stuck on tricky conceptual modules, you can explore expert study guides for Defence on ExamBhai to clarify complex theories instantly.
Cut-Off Trends
Based on historical trends published by the UPSC on upsc.gov.in, the cutoff for the NDA written examination typically hovers around 25% to 35% of the total marks in each subject, alongside an overall aggregate cutoff that ranges between 340 and 360 marks out of 900. Because competition intensifies with every session, aiming for an aggregate score above 400 ensures a safe berth in the final merit list regardless of SSB score fluctuations. Physics mastery plays a direct role in boosting your GAT score past this safe threshold.
Frequently Asked Questions
Q1: How many questions are asked from physics in the NDA GAT paper?
Answer: Typically, between 25 and 30 questions are asked from physics out of the 150 total questions in the GAT paper, carrying a total weightage of roughly 100 to 120 marks.
Q2: Are the physics numericals in NDA very difficult?
Answer: No, the numerical problems are generally straightforward and formula-based, designed to test basic application rather than advanced calculus or lengthy calculations.
Q3: Is NCERT enough to clear NDA physics?
Answer: Yes, mastering Class 11 and Class 12 NCERT Physics textbooks, supplemented by consistent practice of previous years' questions, is more than sufficient to score high in the physics section.
Q4: What are the most important physics topics for NDA?
Answer: Mechanics, Optics, Current Electricity, Thermodynamics, and Magnetism are the highest-yielding topics that consistently account for the bulk of physics questions in the exam.
Q5: Is there negative marking in the NDA physics section?
Answer: Yes, since physics is part of the GAT paper, every incorrect answer incurs a penalty of one-third ((1/3)) of the marks assigned to that question, which translates to (-1.33) marks.
Q6: Can female candidates appear for the NDA exam?
Answer: Yes, eligible unmarried female candidates can apply for the NDA exam across all three wings—Army, Navy, and Air Force—in accordance with guidelines issued by the UPSC.
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