Class 10 Science: How to Read Case-Based Questions
A case-based question rewards using the information in the passage. Recognising the chapter is only the starting point; your answer must connect a claim to the particular observation or data supplied.
Sources checked 2 October 2026 · original study guide · CBSE/NCERT context
Exam-writing guide · Read at your own pace
Three different jobs
Swipe across the table to see all columns.
| Task | What to write | Example wording |
|---|---|---|
| Observation | What was measured or seen | “The measured value increased from 4 to 7.” |
| Inference | What that pattern supports | “Under these conditions, the increase is consistent with…” |
| Explanation | A scientific reason for the pattern | Name the relevant process and connect it to the change. |
Read a small original dataset
Imagine a study task reports dissolved oxygen of 8 mg/L upstream and 5 mg/L downstream of a discharge point. The direct observation is a difference of 3 mg/L between those samples. This pair of readings alone does not prove that the discharge caused the difference. Temperature, sampling time and other inputs could matter.
A stronger follow-up would repeat samples under comparable conditions and examine relevant alternative explanations. The purpose here is not to diagnose a real river but to distinguish a measured difference from an established cause.
Original case: compare a controlled resistance test
A student records potential difference and current for the same resistor, keeping its temperature approximately constant. Treat the following readings as supplied idealised data, not measurements made by TutorMax.
Use this case to practise reasoning from supplied data. It makes no prediction about which topics will be assessed; confirm the current topic list with your school where the official curriculum notes conflict.
Swipe across the table to see all columns.
| Potential difference (V) | Current (A) | V/I (Ω) |
|---|---|---|
| 1.5 | 0.30 | 5 |
| 3.0 | 0.60 | 5 |
| 4.5 | 0.90 | 5 |
Annotate an answer by evidence and limit
Observation: current rises from 0.30 A to 0.60 A when voltage doubles from 1.5 V to 3.0 V. Calculation: each V/I ratio is 5 Ω. Inference: these readings are consistent with Ohm’s law for this resistor at the stated approximately constant temperature. Limit: the table does not prove that every conductor obeys Ohm’s law under every condition.
If a fourth reading at 6.0 V were 1.10 A, its ratio would be about 5.45 Ω. Report the departure first. Heating or measurement error could be investigated, but this table alone cannot establish which caused it. Do not silently change the reading to 1.20 A to make the pattern fit.
Work through a case systematically
Read the actual demand
Underline whether it asks you to identify, calculate, compare, predict or explain.
Extract the relevant evidence
Write the two readings, quoted condition or observation needed for that subpart.
Apply one concept
Connect the evidence to the appropriate principle without retelling the entire chapter.
Limit the conclusion
State the condition or assumption that prevents an overgeneralisation.
Check the graph before finding a trend
Read both axis labels and units, the scale, the key and any baseline that does not start at zero. A steep-looking line may reflect the chosen scale. If asked for a numerical change, calculate it from labelled values rather than describing the visual impression.
Distinguish the variable deliberately changed, the response measured and the conditions held fixed. In an observational comparison, you may not have a controlled independent variable at all. Do not claim an experiment controlled a condition unless the passage says so.
Review with the current paper and scheme
Use the official CBSE sample paper as a source of question forms and its matching scheme to review your reasoning. These examples are original study illustrations, not copied board questions or predictions. Record whether each mistake came from reading the data, selecting the concept or overstating the conclusion.
Choose what to study next
Sources and scope
This is a focused learning resource, not a complete chapter or a prediction of board questions. Use your current syllabus and the paper-specific marking scheme for assessment requirements.
Stuck on an earlier skill?
Choose the specific step that is causing difficulty. Return to this lesson after repairing it; you do not need to complete every foundation page.
Frequently asked questions
Can two values prove a general trend?
They establish the difference between those measurements. A broader trend or causal claim usually needs more evidence and an appropriate design.
PERSONAL SUPPORT
Bring the step that still feels unclear
A worked attempt helps a tutor identify the concept or reasoning that needs attention.
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