Introduction Waves and Sound form an important and high-scoring portion of the Physics syllabus for NDA and CDS examinations. This topic explains how energy is transferred through oscillations and vibrations without the actual transfer of matter. In competitive exams like NDA–CDS, questions from this chapter are generally conceptual, formula-based, and application-oriented, making a strong conceptual … Read more
Introduction Light is one of the most important topics in Physics for NDA and CDS examinations because it directly connects basic physical principles with everyday phenomena. The chapters Reflection of Light, Refraction of Light, and Human Eye and the Colourful World together explain how light behaves when it strikes surfaces, passes through different media, and … Read more
Introduction Physics is the backbone of the NDA and CDS examinations, and Units and Dimensions form the foundation of the entire Physics syllabus. Every physical quantity—whether it is force, energy, pressure, or velocity—must be expressed correctly using appropriate units. Without a strong understanding of units and dimensions, solving numerical problems becomes error-prone and time-consuming. In … Read more
Introduction The study of the nucleus and radioactivity forms an important part of modern physics and plays a crucial role in understanding the fundamental structure of matter. The nucleus, discovered in the early 20th century, is the dense central core of an atom containing protons and neutrons, collectively called nucleons. Despite its extremely small size, … Read more
Introduction Heat transfer is one of the most important topics in Physics and plays a vital role in understanding natural phenomena as well as practical applications in daily life. Heat transfer explains how thermal energy flows from one body to another due to a temperature difference. According to the laws of thermodynamics, heat always flows … Read more
The Magnetic Effect of Current is one of the most important topics in Class 13 Physics and forms a strong foundation for understanding electromagnetism. This phenomenon explains how electric current produces a magnetic field around a conductor. The discovery of this effect by Hans Christian Ørsted in 1820 established a direct relationship between electricity and … Read more
Introduction Electricity is one of the most important and scoring units of Class 12 Physics for NDA and CDS examinations. This chapter builds the foundation of electrostatics, current electricity, capacitors, and electrical circuits, which are essential not only for exams but also for understanding modern technology and defense applications. The study of electricity explains how … Read more
Introduction Electrostatics is the branch of physics that deals with the study of electric charges at rest and the forces, fields, and potentials associated with them. It forms the foundation of electricity and magnetism, which is an important part of Class 11 Physics syllabus and holds significant weightage in NDA and CDS examinations. Understanding electrostatics … Read more
Introduction Gravitation and Hydrostatics form an important part of Class 10 Physics and are highly relevant for NDA and CDS examinations. These chapters explain the fundamental forces that govern natural phenomena, from the motion of planets to the behavior of liquids at rest. Understanding these concepts builds a strong base for solving numerical problems and … Read more
Introduction In our daily life, we observe many objects that not only move in a straight line but also rotate about an axis. For example, a spinning top, rotating ceiling fan, bicycle wheel, Earth rotating about its axis, and the blades of a helicopter. This type of motion, where a body moves around a fixed … Read more
