ICSE Class 10 Physics 2026 Solved Study Guide | ICSE Board
What is ICSE Class 10 Physics?
ICSE Class 10 Physics is the Physics part of the ICSE Science subject, commonly treated in schools as Physics or Science Paper 1. For students searching for ICSE Class 10 Physics 2026, the useful aim is to master the syllabus topics, formulas, diagrams, units, and answer-writing method instead of relying on last-minute lists.
A good Physics answer shows the concept first and the calculation next. In numericals, write the known values, formula, substitution, final value, and unit. In diagrams, show direction, labels, and the physical idea being tested.
ICSE Class 10 Physics syllabus map
The official CISCE syllabus is the final reference. Textbook chapter names may vary slightly by publisher, but ICSE Class 10 Physics is usually built around these topic groups.
| Topic group | What to learn | Skill tested |
|---|---|---|
| Force, work, energy, power, and machines | Moment of force, equilibrium, work, energy, power, mechanical advantage, velocity ratio, and efficiency. | Choosing formulas, converting units, and explaining machine behaviour. |
| Light and optics | Refraction, total internal reflection, lenses, ray diagrams, spectrum, dispersion, and scattering. | Ray direction, sign convention, and labelled diagrams. |
| Sound | Wave nature of sound, echo, frequency, pitch, loudness, resonance, and related applications. | Definitions, reasoning answers, and use of v=f\lambda. |
| Electricity and magnetism | Ohm’s law, resistance, electrical power, energy, household circuits, electromagnets, and induction. | Circuit reading, power-energy conversion, and direction rules. |
| Heat and radioactivity | Heat, temperature, heat capacity, specific heat capacity, calorimetry, latent heat, and basic radioactivity. | Definitions, Q=mc\Delta\theta numericals, and unit accuracy. |
Concept snapshot: read a formula as a sentence
A formula is a Physics sentence written in symbols. Q=mc\Delta\theta says that heat supplied depends on mass, material, and temperature rise. If the same material has twice the mass and the same rise in temperature, it needs twice the heat. This habit helps you solve reasoning questions as well as numericals.
How to study Physics chapter clusters
Use diagrams for optics and circuits
For refraction and lenses, draw the principal axis or normal first, then draw rays with arrows. In household circuits, keep live, neutral, and earth connections clear. A diagram is marked for Physics logic, not for decoration.
Use unit checks before substitution
Convert quantities before using a formula. For example, if power is in kilowatt and time is in hour, energy is in kilowatt-hour. If power is in watt and time is in second, energy is in joule.
Know the external and internal structure
In the standard ICSE Science structure, Physics has an external theory paper and internal school assessment. The commonly used split is 80 marks for theory and 20 marks for internal assessment, but the latest CISCE and school instructions should be followed for the examination year.
Formula and unit checklist for ICSE Class 10 Physics
| Idea | Relation | Unit reminder |
|---|---|---|
| Work | W=Fs | W in joule, F in newton, s in metre |
| Power | P=\frac{W}{t} | P in watt |
| Ohm’s law | V=IR | V in volt, I in ampere, R in ohm |
| Electrical energy | E=Pt | 1\,\text{kWh}=3.6\times10^6\,\text{J} |
| Lens formula | \frac{1}{f}=\frac{1}{v}-\frac{1}{u} | Apply sign convention before substitution |
| Calorimetry | Q=mc\Delta\theta | c in \text{J kg}^{-1}\text{K}^{-1} |
Worked examples for ICSE Class 10 Physics
These original worked examples show the school-style method. They are for practice and are not copied from any exercise.
Worked Example 1: Heat needed to warm water
Question: Find the heat required to raise the temperature of 0.50\,\text{kg} of water by 20\,\text{K}. Take c=4200\,\text{J kg}^{-1}\text{K}^{-1}.
Step 1: Use the calorimetry formula.
Q=mc\Delta\theta
Step 2: Substitute m=0.50\,\text{kg}, c=4200\,\text{J kg}^{-1}\text{K}^{-1}, and \Delta\theta=20\,\text{K}.
Q=0.50\times4200\times20
Step 3: Calculate.
Q=42000\,\text{J}=4.2\times10^4\,\text{J}
Final answer: The heat required is 4.2\times10^4\,\text{J}.
Worked Example 2: Electrical energy used by a lamp
Question: A 60\,\text{W} lamp is used for 5\,\text{h}. Find the energy consumed in \text{kWh} and joule.
Step 1: Convert power into kilowatt.
60\,\text{W}=0.060\,\text{kW}
Step 2: Use E=Pt.
E=0.060\times5=0.30\,\text{kWh}
Step 3: Convert to joule.
E=0.30\times3.6\times10^6=1.08\times10^6\,\text{J}
Final answer: The energy consumed is 0.30\,\text{kWh}, or 1.08\times10^6\,\text{J}.
Worked Example 3: Image formed by a convex lens
Question: An object is placed 30\,\text{cm} in front of a convex lens of focal length 15\,\text{cm}. Using Cartesian sign convention, find the image distance and magnification.
Step 1: For a convex lens, f=+15\,\text{cm}. The object is on the left, so u=-30\,\text{cm}.
Step 2: Use the lens formula.
\frac{1}{f}=\frac{1}{v}-\frac{1}{u}
Step 3: Substitute values.
\frac{1}{15}=\frac{1}{v}-\frac{1}{-30}=\frac{1}{v}+\frac{1}{30}
Step 4: Solve for v.
\frac{1}{v}=\frac{1}{15}-\frac{1}{30}=\frac{1}{30}
v=+30\,\text{cm}
Step 5: Find magnification.
m=\frac{v}{u}=\frac{30}{-30}=-1
Final answer: The image is 30\,\text{cm} on the other side of the lens. Magnification is -1, so the image is real, inverted, and the same size as the object.
Examiner’s mindset for Physics answers
In ICSE Class 10 Physics, a numerical answer can earn credit for formula, substitution, calculation, and unit. A diagram answer can earn credit for layout, direction, labels, and conclusion. This is why the working matters as much as the final line.
In optics, the sign convention should be visible. In electricity, the conversion between \text{W}, \text{kW}, second, hour, joule, and \text{kWh} should be visible. In calorimetry, write \Delta\theta as the change in temperature, not as the final temperature.
Common mistakes in ICSE Class 10 Physics
- Confusing power and energy: Use P=\frac{W}{t} for power and E=Pt for electrical energy.
- Dropping units: A numerical value such as 42000 is incomplete unless the unit \text{J} is written.
- Ignoring sign convention in lenses: Decide u, v, and f before using the lens formula.
- Mixing heat and temperature: Heat is measured in joule; temperature is measured in kelvin in SI and tells the direction of heat flow.
- Writing Joule’s heating law wrongly: Heat produced is H=I^2Rt, not H=IRT.
Study resources and practice links
Use the official CISCE syllabus with your school-prescribed textbook. Then practise from solved examples, chapter questions, and papers.
| Resource | How to use it |
|---|---|
| Selina Concise Physics Class 10 solutions | Compare full working after attempting textbook questions. |
| ICSE Class 10 Physics previous year papers | Practise timed answers and repeated question types. |
| ICSE Class 10 Physics sample papers | Use for mixed revision after completing the syllabus. |
| ICSE Class 10 Physics important questions | Revise common definitions, numericals, and diagrams. |
Frequently Asked Questions
How should I start ICSE Class 10 Physics preparation if my basics are weak?
Start ICSE Class 10 Physics with units, formula meanings, and one solved numerical from each main topic group. Do not memorise formulas without knowing the quantities and SI units.
Is ICSE Class 10 Physics 2026 only about numericals?
No. ICSE Class 10 Physics 2026 preparation should include numericals, definitions, laws, ray diagrams, circuit diagrams, graph interpretation, units, and short reasoning answers.
Which ICSE Class 10 Physics chapters need the most diagram practice?
Refraction at plane surfaces, lenses, spectrum, household circuits, and electro-magnetism need repeated diagram practice. Labels, direction arrows, and correct connections matter.
What is the safest way to write an ICSE Physics numerical answer?
Write the given values with units, state the formula, substitute values, calculate step by step, and close with the final answer and unit.
Do I need to memorise every derivation in ICSE Class 10 Physics?
Learn the derivations and relationships taught in your school-prescribed textbook, but focus on the starting formula, assumption, steps, and final relationship rather than rote memory alone.
Downloads & PDF Resources
Download the related PDFs, question papers, and study resources below.
| ICSE Class 10 Physics Previous Year Question Papers |