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ICSE physics looks short on paper: six units, one two-hour exam. Then students meet the specimen paper and find that most questions ask them to apply an idea to a new situation rather than recall a definition. This post sets out what the Council for the Indian School Certificate Examinations (CISCE) lists for ICSE 2027, how the paper is laid out, how the practical marks are awarded, and a worked numerical of the kind the syllabus asks for.
How are ICSE 2027 physics marks divided?
The CISCE ICSE 2027 Physics syllabus, part of Science (52), says Class X has "one paper of two hours duration carrying 80 marks and Internal Assessment of practical work carrying 20 marks." It also asks for SI units unless stated otherwise. CISCE publishes a syllabus for each examination year, so check the one for your year before you plan.
The six units are:
Force, Work, Power and Energy: moments and equilibrium, uniform circular motion, work, energy and power, machines (levers and pulley systems), conservation of energy.
Light: refraction through a glass block and prism, total internal reflection, lenses with the lens formula, dispersion, the electromagnetic spectrum and scattering.
Sound: echoes, natural, damped and forced vibrations, resonance, loudness, pitch and quality.
Electricity and Magnetism: Ohm's law, series and parallel resistors, electrical power and energy, household circuits, magnetic effect of current, electromagnetic induction, the transformer.
Heat: calorimetry and the method of mixtures, latent heat (fusion only).
Modern Physics: radioactivity, alpha, beta and gamma decay, nuclear fission and fusion.
The fine print matters. Numerical problems using the lens formula are included but its derivation is not. Scale drawing of ray diagrams is not required. For the magnifying glass, the formula and numericals are excluded. For the DC motor and AC generator, you need a labelled sketch and the energy transfer, but their working is not required.
What does the ICSE 2027 specimen paper look like?
The ICSE 2027 Physics specimen paper gives two hours of writing time after 15 minutes of reading time. Section A (40 marks) is compulsory: Question 1 has 15 one-mark multiple-choice items, and Questions 2 and 3 are split into short parts, most of them worth 2 marks. In Section B (40 marks) you attempt any four of six questions, each worth 10.
CISCE notes that the board paper "can be set from any part of the syllabus", but its format "will remain the same as that of the Specimen Question Paper." Each part is tagged with the skill it tests. Application is the most common tag, appearing 34 times against 12 for Recall, so most marks reward using an idea, not stating it.
How are the 20 practical marks given?
The syllabus suggests twelve experiments and says students "may perform about ten." They include finding the mechanical advantage and velocity ratio of a pulley system, tracing rays through a glass slab and prism, the focal length of a convex lens, specific heat capacity by the method of mixtures, specific latent heat of ice, and verifying Ohm's law from the slope of a graph. You are expected to use least count, significant figures and elementary error handling.
Two people mark the practical work independently: your subject teacher (10 marks) and an External Examiner (10 marks), who may be a teacher from your school who does not teach your class.
Worked example: specific heat by the method of mixtures
This is experiment 9 on the syllabus list, with sample numbers. A 0.1 kg metal block at 100 °C is dropped into 0.2 kg of water at 25 °C. The mixture settles at 30 °C. Ignore heat taken by the container. The specific heat capacity of water is 4200 J/(kg K). Find that of the metal.
Heat lost by the metal = m c ΔT = 0.1 × c × (100 − 30) = 7c.
Heat gained by the water = 0.2 × 4200 × (30 − 25) = 4200 J.
Heat lost = heat gained, so 7c = 4200, giving c = 600 J/(kg K).
Common mistakes. Using the same temperature change for both bodies; taking ΔT from the starting temperatures instead of the final one; and forgetting the container when the question gives its heat capacity, in which case it gains heat along with the water. Our post on calorimetry and heat transfer works through mixing and melting problems.
A practice routine for the term
Weekly: one Section B question under a 15-minute limit, from a different unit each week.
Weekly: three numericals each on machines, lenses and electricity. For the first, see our post on ICSE machines and pulleys.
Fortnightly: redraw one ray diagram from memory, then check it against the textbook.
Ongoing: write up each experiment the week you do it, with least counts stated.
If refraction through a prism or a lens is hard to picture, the Fermi Simulation Lab has interactive simulations for ideas that are easier to see than read.
Today, download the specimen paper, attempt Question 1 in 15 minutes, and mark it against the scheme at the back.
