General Science and Life Science (Class 10 CBSE) — RRB NTPC Study Notes

Overview

General Science forms a crucial component of the General Awareness section in RRB NTPC, accounting for approximately 15-20 questions. This topic covers fundamental concepts from Physics, Chemistry and Biology up to Class 10 CBSE level. The questions test basic scientific principles, definitions, applications and simple numerical problems.

Students must focus on understanding core concepts rather than memorising formulas alone. RRB typically asks direct questions on scientific laws, units, definitions, chemical reactions, human body systems and environmental science. The key to scoring well is maintaining clarity on fundamental principles across all three sciences and their real-world applications, especially those relevant to railways and everyday technology.

A systematic revision of NCERT Class 10 Science textbook chapters, combined with practice of previous year questions, provides the best preparation strategy for this section.

Key Concepts

• **Physics fundamentals**: Light reflection/refraction, electricity (Ohm's law, power, series/parallel circuits), magnetic effects of current, energy sources (renewable/non-renewable), and basic mechanics (force, work, power, energy).

• **Chemical reactions and equations**: Understanding balancing equations, types of reactions (combination, decomposition, displacement, redox), and recognising common chemical formulas of acids, bases and salts.

• **Periodic classification**: Trends in the periodic table (atomic size, metallic character, valency), groups and periods, and properties of metals/non-metals/metalloids.

• **Human physiology**: Functions of major organ systems — digestive, respiratory, circulatory, excretory, nervous and reproductive systems, along with common diseases and preventive measures.

• **Plant biology**: Photosynthesis, respiration, transportation in plants, nutrition modes (autotrophic/heterotrophic), and plant hormone functions.

• **Genetics and evolution**: Mendel's laws, inheritance patterns, DNA structure basics, natural selection, and evidence for evolution (fossils, homologous organs).

• **Environmental science**: Ecosystem components, food chains/webs, ozone layer depletion, greenhouse effect, waste management and biodegradable/non-biodegradable materials.

• **Practical applications**: Understanding how scientific principles apply to railway operations — electrical traction, signalling systems, material strength, energy efficiency and environmental compliance.

Key Facts

**Physics:** • SI unit of electric current: Ampere (A); Resistance: Ohm (Ω); Power: Watt (W); Energy: Joule (J) • Ohm's Law: V = IR (Voltage = Current × Resistance) • Electric Power: P = VI = I²R = V²/R • Laws of reflection: Angle of incidence = Angle of reflection; incident ray, reflected ray and normal lie in same plane • Refractive index: Speed of light in vacuum / Speed of light in medium • Fleming's Left Hand Rule determines direction of force on current-carrying conductor in magnetic field