NDA & CDS 1 2026 Exam Physics –MCQ Class 3

Introduction

Physics plays a crucial role in the preparation of competitive defence examinations like NDA and CDS, as it tests not only conceptual understanding but also analytical and problem-solving abilities. Among the various topics, Kinematics and Optics form a foundational part of the syllabus. These topics are frequently tested through objective (MCQ-based) questions that require clarity of concepts and speed in calculations.

This class (Class 3) focuses on strengthening the fundamental principles of motion and light, ensuring students are well-prepared to tackle exam-oriented questions with confidence.

Overview of Topics

1. Kinematics

Kinematics is the branch of physics that describes the motion of objects without considering the causes of motion.

Key Concepts Covered:

• Types of motion: Rectilinear and Curvilinear motion
• Distance vs Displacement
• Speed vs Velocity
• Acceleration (uniform and non-uniform)
• Equations of motion:
  • $v = u + at$v=u+at
  • $s = ut + \frac{1}{2}at^2$s=ut+21​at2
  • $v^2 = u^2 + 2as$v2=u2+2as
• Graphical analysis:
  • Velocity-time graphs
  • Position-time graphs

MCQ Focus:

• Direct formula-based questions
• Graph interpretation
• Conceptual traps (distance vs displacement, speed vs velocity)

2. Optics

Optics deals with the study of light and its behavior.

Key Concepts Covered:

• Reflection of light:
  • Laws of reflection
  • Plane mirrors and image formation
• Refraction of light:
  • Snell’s Law
  • Refractive index
• Lenses:
  • Convex and concave lenses
  • Lens formula: $\frac{1}{f} = \frac{1}{v} + \frac{1}{u}$f1​=v1​+u1​
  • Magnification
• Optical instruments (basic understanding)

MCQ Focus:

• Ray diagram-based questions
• Numerical problems using formulas
• Conceptual understanding of image formation

Approach for MCQs

• Focus on concept clarity over rote learning
• Practice formula application under time constraints
• Avoid common mistakes in sign conventions (especially in optics)
• Solve previous year questions to understand exam trends

Few Lines on NDA/CDS 1 2026 Exam

The NDA/CDS 1 2026 examination is a highly competitive national-level exam conducted to recruit candidates for the Indian Armed Forces. Physics forms an essential part of the General Ability Test (NDA) and General Knowledge (CDS).

• Questions are objective (MCQ-based)
• Emphasis is on conceptual clarity and speed
• Topics like Kinematics and Optics are frequently asked and scoring areas
• Regular practice and revision are key to success

Conclusion

Kinematics and Optics are fundamental topics that not only build the base for advanced physics but also offer excellent scoring opportunities in NDA/CDS exams. Mastering these topics requires a balanced approach of theory, numerical practice, and MCQ solving.

With consistent practice, clarity of concepts, and exam-oriented preparation, students can significantly improve their performance and gain confidence in tackling physics questions in NDA/CDS 1 2026.