General Science Questions for SSC GD

Physics Fundamentals

Physics questions in SSC GD test basic mechanics, light, electricity, and magnetism. Most questions are definition-based or require simple numerical calculation. The exam rarely goes beyond 10th-class NCERT level. Focus on everyday applications: why objects fall, how levers work, what makes magnets attract, how electricity flows in circuits.

• Force = mass × acceleration (Newton's second law). Understand that heavier objects need more force to move.
• Friction opposes motion. Rough surfaces have high friction; smooth surfaces have low friction.
• Light travels in straight lines and reflects off mirrors (angle of incidence = angle of reflection).
• Electricity: current flows from positive to negative terminal. Conductors allow flow; insulators block it.
• Simple machines (lever, pulley, inclined plane) reduce effort needed to do work.
• Magnetism: opposite poles attract, same poles repel. Earth acts as a giant magnet.

Chemistry Essentials

Chemistry in SSC GD focuses on states of matter, chemical reactions, acids/bases, and everyday chemistry. Questions test recognition of compounds, understanding of pH scale, and simple reaction concepts. Avoid memorizing complex equations; instead, understand why reactions happen and what products form.

• Matter exists in three states: solid (fixed shape), liquid (fixed volume, takes container shape), gas (no fixed shape or volume).
• Acids taste sour and turn blue litmus red (pH < 7). Bases taste bitter and turn red litmus blue (pH > 7).
• pH scale: 0-7 is acidic, 7 is neutral, 7-14 is basic. Common acids: lemon juice, vinegar. Common bases: soap, baking soda.
• Combustion is burning — requires fuel, oxygen, and heat (fire triangle). Products are usually carbon dioxide and water.
• Rusting is oxidation of iron in presence of oxygen and moisture. Prevention: paint, oil, or galvanization.
• Salt is formed when acid reacts with base (acid + base = salt + water).

Biology and Human Body

Biology questions emphasize human anatomy, nutrition, reproduction, and disease prevention. SSC GD expects you to know major organs, their functions, and how to maintain health. This is high-frequency territory — expect 2-3 questions per paper.

• Digestive system: mouth (chewing) → stomach (acid digestion) → small intestine (nutrient absorption) → large intestine (water absorption).
• Respiratory system: nose → trachea → lungs. Oxygen enters blood; carbon dioxide exits.
• Circulatory system: heart pumps blood through arteries and veins. Blood carries oxygen and nutrients.
• Skeletal system: 206 bones in adult body. Provide structure, protect organs, enable movement.
• Nervous system: brain and spinal cord control all body functions via nerves.
• Reproduction: male produces sperm, female produces egg. Fertilization creates embryo.
• Immunity: white blood cells fight infection. Vaccination trains immune system to recognize pathogens.

Earth Science and Environment

Earth Science covers rocks, soil, weather, water cycle, and environmental conservation. SSC GD emphasizes practical knowledge: how weather forms, why soil is important, and conservation of natural resources. Questions often link to defence/paramilitary context (disaster management, water scarcity).

• Water cycle: evaporation (water → vapor) → condensation (vapor → cloud) → precipitation (rain/snow) → collection (rivers/oceans).
• Three rock types: igneous (from magma), sedimentary (compressed layers), metamorphic (heat/pressure transformed).
• Soil formation takes centuries. Weathering of rocks + organic matter = fertile soil.
• Atmosphere layers: troposphere (weather happens here), stratosphere (ozone layer), mesosphere, thermosphere.
• Natural disasters: earthquakes (tectonic movement), cyclones (rotating storms), floods (excess water).
• Conservation: reduce, reuse, recycle. Protect forests, water, and wildlife for future generations.

Common Everyday Science

SSC GD loves practical science — things you see daily. Why does ice melt? How does a refrigerator work? Why does salt dissolve in water? These questions test understanding, not memorization. Link concepts to real life.

• Melting point: temperature at which solid becomes liquid (ice melts at 0°C).
• Boiling point: temperature at which liquid becomes gas (water boils at 100°C).
• Density: how tightly packed matter is. Oil floats on water because oil is less dense.
• Pressure: force per unit area. Sharper objects exert more pressure (needle vs. flat end).
• Reflection: light bounces off shiny surfaces (mirrors). Refraction: light bends when passing through different materials (water, glass).
• Sound travels slower than light. That's why you see lightning before hearing thunder.

• Confusing speed and velocity. Speed is just how fast; velocity includes direction. SSC GD asks 'speed' — give distance/time only.
• Mixing up acids and bases. Remember: Acids are sour (lemon), Bases are bitter (soap). Don't reverse the pH scale.
• Forgetting that combustion needs three things: fuel, oxygen, heat. If any one is missing, fire stops. Aspirants often forget oxygen.
• Thinking all bacteria are harmful. Many bacteria are useful (yogurt, soil fertility). SSC GD may ask about beneficial microorganisms.
• Assuming heavier objects always fall faster. In vacuum, all objects fall at same speed. Air resistance matters on Earth.
• Not knowing the difference between weather (short-term) and climate (long-term patterns). Questions often test this distinction.

• DIGESTION PATH: Mouth → Stomach → Small Intestine → Large Intestine. Think 'M-S-SI-LI' or just follow food's journey.
• WATER CYCLE: E-C-P-C (Evaporation → Condensation → Precipitation → Collection). Cycle repeats endlessly.
• FIRE TRIANGLE: Fuel, Oxygen, Heat. Remove any one side, fire dies. Mnemonic: FOH.
• pH SCALE: 0-7 Acidic (A comes before B), 7-14 Basic. Neutral is 7 in middle.
• ROCK TYPES: I-S-M (Igneous from magma, Sedimentary from layers, Metamorphic from transformation).
• LIGHT vs SOUND: Light is fast (lightning first), Sound is slow (thunder second). Speed of light > speed of sound.

• SSC GD asks 1-2 questions on human body systems per paper. Focus on digestive, respiratory, and circulatory systems. Know organ names and functions, not detailed histology.
• Chemistry questions are mostly conceptual: acids/bases, combustion, rusting, states of matter. Avoid heavy equation balancing — that's not tested at this level.
• Physics calculations are simple (F=ma, speed=distance/time). If a question requires complex math, you've misunderstood it. Re-read.
• Environment and conservation are increasingly common. Know water cycle, soil importance, and three Rs (reduce, reuse, recycle). Link to disaster management if possible.
• Recent papers show more 'why' questions than 'what' questions. Example: 'Why does ice float on water?' (density difference) rather than 'What is ice?' Understand concepts, not just definitions.
• Practical/everyday science is preferred over theoretical. Questions like 'Why does salt dissolve in water?' or 'How does a mirror reflect light?' are common. Relate to daily life.