Start with the key idea
Use the official CBSE Science sample paper and matching marking scheme to identify the response types that need work. Check calculations for relationships and units, explanations for cause and evidence, and diagrams for structures, labels and connections. Practise the missing step, then test it on a fresh question. This original plan is not an official paper or an exam prediction.
1. Verify the paper before you plan
CBSE’s official 2026–27 Grade 10 hub links to the Science sample paper and marking scheme. At the check on 28 October 2026, the sample specified 80 marks, three hours and 39 questions, arranged into Biology, Chemistry and Physics sections.
Read the actual instructions and internal choices on the paper. A school assessment can use different arrangements. This page does not announce an examination date or assume that a particular question will recur in 2027.
Attempt the questions before opening the scheme. Keep the original response, including an incomplete diagram or crossed-out formula, because it helps locate the first uncertainty. A final copied answer removes that evidence.
If you work in shorter sections, label the attempt accordingly. Note time, breaks and any help used. It can still guide learning, but compare it only with work done under similar conditions.
2. Sort the difficulty by response type
A calculation needs the relevant relationship, correct quantities, consistent units and a sensible result. A scientific explanation needs linked reasons that answer the particular question. A diagram needs the correct structures and relationships, not just tidy artwork.
Record the topic as well as the type. “Electricity: mixed current and voltage” is more informative than “Physics weak”. “Biology: label attached to the wrong structure” suggests a different repair from “cannot explain the structure’s function”.
Some questions combine response types. A circuit question may require a diagram, a calculation and an explanation of what changes. Review each requested part instead of assuming that one correct numerical answer completes the whole task.
Use this log: question reference; response type; first missing or incorrect step; targeted practice; later independent check. The log is a planning aid, not a diagnosis of the learner.
3. Review calculations from quantities to units
Before substituting, write what each number represents. For a resistor with 8 V across it and a current of 0.4 A through it, the resistance is R = V ÷ I = 20 Ω. Multiplying the two givens would calculate power, not resistance.
For time-dependent quantities, convert time to the units required by the relationship. A current of 0.5 A for two minutes transfers Q = It = 0.5 × 120 = 60 C. Using two seconds would answer a different question.
Check whether the conditions match the relationship. For example, comparing current as voltage changes under Ohm’s law assumes resistance stays constant over the comparison. State the assumption when it matters rather than presenting a proportional rule as universal.
Repair one step at a time. If the unit conversion is wrong, use several conversion checks before a full multi-step question. If the quantities are confused, return to the meanings of current, voltage and resistance before doing more substitution.
4. Turn a remembered fact into a causal explanation
An explanation should connect a cause to the requested effect. “More surface area” may be a useful phrase, but it is incomplete unless the reader can see what has more surface area and why that changes the process.
For a question comparing evaporation from equal amounts of water in a shallow dish and a narrow container, a useful answer identifies the larger exposed liquid surface in the dish and connects it to more opportunities for molecules to escape. It also keeps other conditions, such as temperature and airflow, comparable.
Do not add scientific-sounding sentences that change the claim. Evaporation does not require the entire liquid to boil. A relevant short explanation is better than a longer paragraph containing a contradiction.
When reviewing with a scheme, identify the ideas that earn credit and how they connect. Practise expressing the reasoning in your own words, then check accuracy. A memorised sentence may fail when the question changes its conditions.
5. Review diagrams as information
Start by naming the purpose of the diagram. A circuit should show connections clearly; a ray diagram should show the required paths and directions; a biological diagram should identify relevant structures. Artistic detail cannot compensate for a wrong connection.
Use a blank page for the first redraw. Add labels whose leader lines end on the intended structure, not somewhere nearby. Keep labels legible and avoid crossing lines when a clearer arrangement is possible. Check the school’s expected conventions for the specific diagram.
Next explain what each important label contributes. For a circuit, say where a meter is connected and which quantity it measures. For a biological structure, connect the name with the function required by the question. Redrawing the outline alone does not establish understanding.
Compare with a reliable source after the attempt, mark the specific error, and redraw later without tracing. This guide uses paper-based review; it does not ask students to build electrical circuits or conduct chemical experiments at home.
6. A two-week schedule with room for repair
Days 1–2: complete the official sample attempt in a full sitting or labelled sections. Days 3–4: use the scheme to sort errors by topic and response type. Choose a small number of recurring needs rather than rewriting every answer.
Days 5–7: alternate one calculation session, one explanation session and one diagram session where those are the observed needs. For each, use a worked model, try a fresh task and explain the correction. If a type is already secure, spend that session on a different demonstrated need.
Days 8–10: mix topics so the question does not announce which formula or explanation to use. Revisit an earlier diagram from memory. Record hints and reference use instead of treating assisted work as independent.
Days 11–14: try fresh school-approved questions under comparable conditions, then update the log. Leave a buffer session. If errors remain, narrow the repair rather than simply adding more papers.
For parents, a useful check is to ask for one before-and-after example and a later independent attempt. Bring persistent conceptual questions to the teacher. This plan supports revision and does not predict a board-exam score.
5 worked examples with reasoning
1. A learner writes R = 8 × 0.4 = 3.2 Ω for a resistor.
- The stated quantities are voltage 8 V and current 0.4 A.
- Resistance uses division: R = V/I = 8/0.4 = 20 Ω.
- The product VI would be power, measured in watts. Repair formula selection, not just the final arithmetic.
2. A current of 0.3 A flows for three minutes. A learner gets Q = 0.9 C.
- The relationship Q = It requires time in seconds when current is amperes and charge is coulombs.
- Three minutes is 180 seconds, so Q = 0.3 × 180 = 54 C.
- The first error was the unit conversion. Retest with another time value.
3. An answer says evaporation happens only at 100°C.
- Evaporation can occur at the surface below the boiling point.
- Boiling and evaporation are different processes; boiling temperature also depends on pressure.
- Repair the process distinction, then explain a drying-clothes example under stated conditions.
4. A circuit diagram is neat, but the voltmeter is drawn in the only current path.
- A voltmeter measures potential difference across a component.
- In the usual ideal school circuit, connect it in parallel across that component. An ammeter is connected in series for current.
- Redraw and explain the connection rather than merely moving a symbol by imitation.
5. An answer to “why” supplies only a definition.
- Check what effect or comparison the question asks you to explain.
- Add the causal link between the relevant property and that effect.
- Retain only facts that contribute to the requested explanation; use the actual scheme for credit decisions.
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Try each question before opening its explanation. Show the calculation, evidence or reasoning that supports your answer.
12 practice questions with explanations
Try each question before opening its explanation. Show the calculation, evidence or reasoning that supports your answer.
Write an answer and your reason before opening the explanation. Check the reasoning as well as the final answer.
- Set up
Record the session and subject code on the official Science paper.
Answer and reasoning
2026–27 and Science 086 on the inspected paper.
Check your own downloaded copy and use its matching marking scheme.
- Calculate
A resistor has 12 V across it and carries 0.6 A. Find resistance.
Answer and reasoning
20 Ω.
R = V/I = 12/0.6.
- Calculate
A current of 0.2 A flows for five minutes. Find charge.
Answer and reasoning
60 C.
Five minutes is 300 seconds; Q = 0.2 × 300.
- Units
What is missing from “resistance = 15”?
Answer and reasoning
The unit, normally ohms here.
Write 15 Ω after also verifying the relationship and arithmetic.
- Explain
Why does a wider exposed water surface often speed evaporation under otherwise comparable conditions?
Answer and reasoning
More liquid surface is available for molecules to escape.
Keep temperature, airflow and other relevant conditions comparable.
- Explain
Does a longer explanation automatically earn more marks?
Answer and reasoning
No.
Relevant, accurate reasoning must answer the actual question. Extra contradictions can weaken an answer.
- Diagram
Where is a voltmeter connected to measure potential difference across a resistor?
Answer and reasoning
In parallel across the resistor.
Its two terminals connect to the two points whose potential difference is measured.
- Diagram
Why should a label line end on the exact structure?
Answer and reasoning
It removes ambiguity about what the label names.
A correct word pointing to a different part is still misleading.
- Diagnose
The correct formula is followed by a wrong time conversion. What should be logged first?
Answer and reasoning
The time-conversion error.
Do not discard correct earlier reasoning when identifying the repair.
- Plan
Choose a fresh diagram task for a later check.
Answer and reasoning
For example, redraw a simple circuit with an ammeter in series and a voltmeter across its resistor.
Use paper only; compare connections and explain their purposes.
- Transfer
How can you test an explanation beyond memorised wording?
Answer and reasoning
Change the conditions and ask which part of the explanation still applies.
The learner should link evidence and cause, not repeat an unrelated paragraph.
- Review
What information should accompany a self-review score?
Answer and reasoning
Time, support, guesses and unresolved marking questions.
Those conditions affect how the result can be interpreted.
Use the ideas without looking at the notes
Science repair card: Topic ___. Response type ___. First wrong step ___. Correct relationship or idea ___. Fresh task ___. Later result ___. Question for my teacher ___.
Keep one calculation, one explanation and one diagram in your later review only where each is relevant to your syllabus and observed needs. Use the original paper and marking scheme for official question wording and marking expectations.
Common questions
Is this an official Science sample paper?
No. It is an original revision plan linking to official CBSE materials. The worked questions here are BananaLearn examples.
Should every revision session include Biology, Chemistry and Physics?
Not necessarily. Use the attempt to select needs, then include mixed practice later so earlier topics are revisited.
Can I learn diagrams by tracing them?
Tracing can help notice details, but an independent redraw and explanation are needed to check what you can recall and understand.
How do I mark a different valid explanation?
Compare the scientific ideas and required reasoning with the scheme. Ask your teacher when credit is uncertain.
Does this predict the 2027 questions?
No. A sample paper supports practice and format familiarity; it does not establish which questions will appear in the final examination.
Connect your learning
Ask about guided Science learning if your child needs help explaining these ideas.
About this guide
Original explanations, examples, diagrams and practice by BananaLearn. The grade label indicates the intended learning level; this is not an official textbook extract or exam paper.