Physics questions in competitive exams (SSC, Railway, Police, CTET) are mostly conceptual and application-based at the Class 9–10 level. Unlike JEE or NEET, you are not expected to solve complex numerical problems — the focus is on understanding principles, SI units, formulae, and real-life applications. With 15–20 days of focused NCERT study plus previous-year questions, this section becomes highly scoring.

Key Topics Covered

Motion: distance, displacement, speed, velocity, acceleration, Newton's laws, friction
Force, Work, Energy, and Power (kinetic and potential energy, conservation of energy)
Gravitation: universal gravitation, weight vs mass, escape velocity, orbital mechanics
Sound: wave properties, frequency, amplitude, speed in different media, echo, ultrasound
Light: reflection, refraction (Snell's law), lenses, mirrors, dispersion, human eye defects
Heat and Temperature: Celsius vs Kelvin, heat transfer (conduction, convection, radiation), specific heat
Electricity: Ohm's law, resistance, series and parallel circuits, electric power
Magnetism: magnetic fields, electromagnets, Fleming's rules, electromagnetic induction
Modern Physics: radioactivity, nuclear fission/fusion, X-rays basics
Units and Measurements: SI units, prefixes, dimensional analysis

Preparation Tips

Memorise SI units for all major physical quantities: force (Newton), energy (Joule), power (Watt), pressure (Pascal), frequency (Hertz), electric charge (Coulomb).
Newton's laws give 1–2 questions in nearly every SSC/Railway exam. Understand each law with a real-life example.
Light and optics: know which type of mirror/lens is used in which application (concave mirror in headlights, convex mirror in rear-view mirrors, convex lens in magnifying glass).
Sound: memorise the speed of sound in air (~340 m/s at room temperature), water (~1480 m/s), and steel (~5100 m/s). Ultrasound applications (SONAR, medical imaging) are frequently asked.
For electricity: practice basic Ohm's law calculations and know that in series circuits, current is same everywhere; in parallel circuits, voltage is same.
Read NCERT Class 9 and 10 Physics chapters thoroughly — most competitive exam physics questions come directly from these two books.

Frequently Asked Questions

What is the difference between speed and velocity?: Speed is a scalar quantity — it only has magnitude (how fast). Velocity is a vector quantity — it has both magnitude and direction. For example, a car moving at 60 km/h has speed 60 km/h. If it moves north at 60 km/h, its velocity is 60 km/h northward. Average speed is total distance / total time; average velocity is total displacement / total time.
What are the most important physics topics for Railway exams?: For RRB Group D and NTPC: Motion and Newton's laws (most important), Work-Energy theorem, Optics (mirrors and lenses), Sound (echo, ultrasound), Electricity (Ohm's law, power), and Magnetism (electromagnet, Fleming's rules). Also know applications: how a transformer works, why the sky is blue (Rayleigh scattering), rainbow formation.