CBSE Grade 10 Science Exam Survival Guide

Window: Board Pattern | Sections: Physics, Chemistry, Biology

Must-do topics

• Physics: Electricity (Ohm’s law, series/parallel, power), Magnetic effects (Fleming LHR/RHR, motors/generators), Light—reflection/refraction (mirror/lens formulae, magnification), Human eye & defects
• Chemistry: Chemical reactions & equations (balancing, types), Acids/Bases/Salts (pH, uses), Metals/Non-metals (properties, reactivity), Carbon & covalent bonding, Periodic classification (trends)
• Biology: Life processes (nutrition, respiration, transport, excretion), Control & coordination (plant/animal), How do organisms reproduce?, Heredity & evolution, Our environment (food chains, ozone, waste)

Top traps (avoid)

• Wrong sign conventions in mirror/lens formula
• Series vs parallel resistance mix-ups
• Confusing genotype/phenotype; incomplete vs codominance

Study split

• Physics 35% | Chemistry 35% | Biology 30%
• Practicals/diagrams: eye, nephron, stomata, ray diagrams

Last-48h checklist

• 20 numericals (10 electricity + 10 light)
• Balance 15 equations; reaction types with examples
• Label 5 diagrams; revise heredity terms (allele, trait, variation)

Quick facts/formulas

• V=IRV=IRV=IR, P=VI=I2R=V2RP=VI=I^2R=\frac{V^2}{R}P=VI=I2R=RV2​
• Lens: 1v−1u=1f\frac{1}{v}-\frac{1}{u}=\frac{1}{f}v1​−u1​=f1​, m=hvho=vum=\frac{h_v}{h_o}=\frac{v}{u}m=ho​hv​​=uv​
• pH < 7 acidic, > 7 basic (25°C)
• Dominant allele masks recessive; variation drives selection

Speed tactics

• G/T/F/U grid for numericals: Given/To find/Formula/Units
• In theory 3–5 markers: define → key point → example → line-close

Exam-day mini-plan

• Physics numericals first; theory mid-paper; diagrams late