General Science Physics Chemistry Biology Class 10 Questions for UP POLICE CONSTABLE

Physics - Motion, Force, and Energy

Physics questions in UP Police focus on Newton's laws, simple machines, and energy concepts. You won't need calculus — just understand what happens and why. Think of force as a push or pull that changes motion. Speed is how fast you go; velocity includes direction. Acceleration is change in speed. Energy is the ability to do work — it comes in forms like heat, light, kinetic (moving), and potential (stored).

• Newton's First Law: Object at rest stays at rest, moving object stays moving unless a force acts on it (inertia).
• Newton's Second Law: Force = Mass × Acceleration (F=ma). Heavier objects need more force to move.
• Newton's Third Law: Every action has equal and opposite reaction. When you jump, you push Earth down; Earth pushes you up.
• Simple machines: Lever, pulley, inclined plane, wheel-axle reduce effort needed to do work.
• Energy conservation: Total energy in a system stays constant; it only changes form (heat to light, potential to kinetic).
• Friction: Force opposing motion. Reduces speed, generates heat. Useful (shoes on ground) and harmful (engine wear).

Chemistry - Atoms, Reactions, and Acids-Bases

Chemistry in UP Police is about recognizing elements, understanding chemical reactions, and knowing properties of common substances. Atoms are tiny building blocks made of protons (positive), neutrons (neutral), and electrons (negative). Elements are pure substances made of one type of atom. A compound is two or more elements chemically bonded. Reactions are when substances change into new substances — atoms rearrange but total number stays same (law of conservation of mass).

• Atomic structure: Nucleus (protons + neutrons) surrounded by electrons in shells. Protons = atomic number.
• Periodic table: Organized by properties. Metals (left side) conduct electricity; non-metals (right side) don't.
• Chemical reactions: Reactants (starting) become products (ending). Combustion (burning), rusting, digestion are common reactions.
• Acids: Sour taste, turn blue litmus red, pH < 7. Examples: lemon juice, vinegar, stomach acid.
• Bases: Bitter taste, turn red litmus blue, pH > 7. Examples: soap, baking soda, ammonia.
• pH scale: 0-7 acidic, 7 neutral, 7-14 basic. Neutralization: acid + base = salt + water.

Biology - Cells, Life Processes, and Human Systems

Biology questions test understanding of living organisms. A cell is the smallest unit of life — all organisms are made of cells. Plant cells have cell wall and chloroplasts; animal cells don't. Photosynthesis is how plants make food using sunlight, water, and carbon dioxide. Respiration is how all living things break down food to release energy. The human body has systems: digestive (breaks food), circulatory (pumps blood), respiratory (breathes), nervous (controls), skeletal (supports), muscular (moves).

• Cell structure: Nucleus (controls cell), mitochondria (power house — releases energy), chloroplasts (in plants — make food).
• Photosynthesis: Plants use sunlight to convert water + CO2 into glucose + oxygen. Happens in chloroplasts.
• Respiration: All cells break down glucose to release energy (ATP). Aerobic (with oxygen) is efficient; anaerobic (without) is less efficient.
• Digestion: Mouth (chewing) → Stomach (acid breaks food) → Small intestine (absorption) → Large intestine (water absorption).
• Circulation: Heart pumps blood through arteries (away from heart) and veins (toward heart). Blood carries oxygen and nutrients.
• Reproduction: Asexual (one parent, identical offspring — bacteria, plants) vs Sexual (two parents, variation — animals).

Common Elements and Compounds in Everyday Life

UP Police loves asking about substances you encounter daily. Oxygen (O2) is in air, needed for respiration and combustion. Carbon dioxide (CO2) is exhaled by animals, used by plants. Water (H2O) is universal solvent. Salt (NaCl) is sodium chloride. Sugar (glucose) is energy source. Iron (Fe) is in blood and tools. Calcium is in bones and milk. These appear in questions about health, safety, and environment.

• Oxygen: Colorless, odorless gas. Supports combustion. 21% of air. Essential for aerobic respiration.
• Carbon dioxide: Colorless, odorless gas. 0.04% of air. Used in photosynthesis. Turns lime water milky (test for CO2).
• Water: Boils at 100°C, freezes at 0°C. Universal solvent. Covers 71% of Earth.
• Common salts: NaCl (table salt), CaCO3 (chalk), CuSO4 (blue vitriol).
• Metals vs Non-metals: Metals conduct electricity, are shiny, malleable; non-metals don't conduct, are dull, brittle.

• Confusing speed and velocity: Speed is just how fast (100 km/h). Velocity includes direction (100 km/h north). UP Police asks 'what is velocity' — include direction in answer.
• Thinking friction is always bad: Friction helps you walk, stop a car, light a match. It's not always harmful — context matters.
• Mixing up acids and bases by taste alone: Some bases taste bitter but are poisonous (ammonia). Use pH paper or litmus, not taste.
• Believing plants only do photosynthesis: Plants also respire 24/7 to release energy. They do both processes simultaneously.
• Thinking mitochondria is only in animal cells: Mitochondria is in BOTH plant and animal cells. Only chloroplasts are plant-specific.
• Confusing reactants and products: Reactants are what you start with; products are what you end with. In combustion, fuel + oxygen are reactants; CO2 + water are products.

• Newton's 3 Laws = REST, PUSH, REACTION. First: things stay as they are. Second: harder push = faster motion. Third: push back happens.
• ACIDS turn Blue Litmus Red (ABR). BASES turn Red Litmus Blue (BRB). Mnemonic: 'A-B-R' and 'B-R-B'.
• Photosynthesis = Photo (light) + Synthesis (making). Plants MAKE food using sunlight. Respiration = breaking down food for ENERGY.
• Digestion path: Mouth → Esophagus → Stomach → Small intestine → Large intestine → Rectum. Remember: M-E-S-S-L-R.
• Cell power house = Mitochondria. Plant factory = Chloroplast. Control center = Nucleus. Think: Power plant, Factory, Office.
• F=ma: Force equals Mass times Acceleration. Heavier or faster = more force needed. Simple: Bigger push for bigger/faster things.

• UP Police asks definition-style questions: 'What is photosynthesis?' or 'Define friction?' — memorize one-line definitions, not long explanations.
• Expect 2-3 questions on human body systems (digestion, circulation, respiration). These are high-frequency. Know the order and function of each organ.
• Physics questions often test Newton's laws through real-life scenarios: 'Why do you fall forward when a bus stops suddenly?' Answer: Inertia (Newton's First Law).
• Chemistry questions focus on acids-bases and everyday reactions. Expect: 'Which is acidic?' or 'What happens when acid meets base?' Prepare simple examples.
• Biology questions rarely require detailed diagrams — focus on function and process. 'How does photosynthesis happen?' is more likely than 'Draw a chloroplast.'
• Time management: Science GK questions are quick — 30-40 seconds per question. If you know the concept, answer fast. Don't overthink.
• Recent papers show more questions on environmental science (photosynthesis, respiration, pollution) than pure physics calculations. Prioritize life processes.