How to Solve Case-Based Questions in Class 10 Science

Case-based questions in Class 10 Science ask you to use a passage, diagram, table or situation alongside what you have learned. Recognising the chapter helps, but it is not the whole answer. You still need to decide which detail matters and what the question actually asks you to do with it.

The CBSE Science curriculum for 2026-27 includes source-based, case-based and passage-based questions among its question types. This guide offers a practice method, not a prediction of the exact cases, section layout or marks in your examination.

Separate the situation from the task

Read the case and its subquestions together. A passage about an electric circuit may ask you to calculate resistance, explain a pattern or identify a condition needed for a conclusion. Those are different tasks even when they use the same readings.

Notice the command word. For “calculate”, identify the quantities and show the relevant working. For “explain”, connect an observation to a scientific idea. For “compare”, make the difference explicit. Do not fill the answer space with everything you remember about the chapter.

Find evidence before choosing an answer

Mark the readings, labels and conditions that the subquestion needs. In a graph, check the axis names, units and scale before describing a trend. In a diagram, follow the labels rather than guessing from the shape. A familiar-looking picture can still contain a changed condition.

Keep what the passage states separate from what you infer. A result recorded under one condition does not automatically describe every possible situation. If the question asks for a reason, name the relevant concept and explain how it fits the evidence given.

Try an original electricity example

The following is an original practice case, not a CBSE question or an official marking scheme. A student measures current through a resistor while keeping its temperature approximately constant. At 4 V, the current is 0.20 A. At 8 V, the current is 0.40 A.

• Calculate the resistance from each reading. Using R = V/I, the first reading gives 4/0.20 = 20 ohms. The second gives 8/0.40 = 20 ohms.
• Describe the relationship in these readings. When potential difference doubles, current also doubles. The calculated resistance remains the same.
• Explain the condition attached to the conclusion. The stated temperature condition matters. Do not turn these readings into a claim that every device has constant resistance under all conditions.

The current curriculum explicitly includes the relationship between current, voltage and resistance through Ohm's law. Check the concept in your textbook, then try a fresh set of values without looking at the worked answer. These numbers are invented teaching data, not experimental measurements collected by EZ Tuitions.

Answer each subpart on its own terms

Check whether a part relies on an earlier answer; do not assume that it does or does not. If you are stuck on one part, read the next part before abandoning the whole case. It may ask for a concept you can explain independently.

Use the question's labels so the examiner can match each answer to its part. Include units in calculations and label a diagram when it helps answer the task. Follow the paper's actual instructions about internal choices. There is no universal sentence count or formula that guarantees full marks.

Use official practice material carefully

CBSE's competency-based learning framework explains assessment objectives and example items. Its Class 10 Science competency question resource provides practice material, but check its topics against your current syllabus. An older resource can contain material that is not part of your present course.

Attempt a question before reading its solution. Then identify the exact gap: a missed condition, a weak concept, an incorrect calculation or an answer that did not address the command word. Rewrite the answer after checking. Copying a model response without testing yourself hides those gaps.

Fit case practice into your revision

Start with a topic you have studied, then attempt cases without being told the chapter in advance. Explain why you chose a concept, not just which answer you selected. A tutor or classmate can ask what detail in the passage supports your reasoning.

Use the Class 10 Science preparation guide for the wider revision plan. If you need help with a recurring concept gap, compare the teaching approach offered through Science tuition rather than expecting a memorised passage bank to cover an unseen case.

Frequently asked questions

Is every competency-based question a case study?

No. Case-based questions are one format. The current CBSE Science curriculum also lists other question types, so practise more than passages alone.

Can I answer only by copying the passage?

Not always. Read the task: it may require you to apply a scientific concept, calculate a value or explain evidence rather than repeat a sentence.

Do all case questions have the same marks?

Do not assume a fixed allocation from this guide. Follow the current paper's instructions and the marks shown beside each subquestion.

What should I do after getting a practice case wrong?

Find whether the error came from reading, concept knowledge or working. Check the solution, explain the correction and attempt a different case without help.