Q1. [4]
Two resistors X (3 Ω) and Y (6 Ω) joined in series with a battery of 2 V, along with a voltmeter and ammeter.
Study the circuit shown in which two resistors X and Y of resistances 3 Ω and 6 Ω respectively are joined in series with a battery of 2 V.
- (I) Draw a circuit diagram showing the above two resistors X and Y joined in parallel with same battery and same ammeter and voltmeter. [1]
- (II) In which combination of resistors will the (i) potential difference across X and Y and (ii) current through X and Y, be the same ? [1]
- (III) Answer either (a) or (b). [2]
Previously asked in CBSE board exam
2025 31/6/1 Q39
Generated by claude-sonnet-4-6 · 2026-06-15 06:45 · grounding stimulus
Model Answer
(I) Parallel Circuit Diagram:
```
+----[3Ω X]----+
| |
+---+----[6Ω Y]----+---[A]---+
| |
+----------[2V battery]-------+
| |
+----[V]----+
```
(Voltmeter connected across both resistors in parallel; ammeter in series with the main line)
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(II)
- Parallel combination: potential difference (voltage) across X and Y will be the same.
- Series combination: current through X and Y will be the same.
---
*(III)(a) OR (b) — [Student to attempt one as per their question paper; sub-question (a)/(b) text not provided in the extract above.]
Source: Chapter 11 – Electricity, NCERT Science Class 10
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Explanation
- For (I), examiners check that both resistors are drawn in parallel branches, voltmeter is across the parallel combination, and ammeter is in the main (series) line.
- For (II), remember the two key rules: in series → same current everywhere; in parallel → same voltage across each branch. These are the most commonly tested lines from this topic.
- For (III), since the actual (a)/(b) options were not printed in the extract, attempt whichever sub-question your paper provides (likely a calculation of equivalent resistance or current).
If a question refers to an image, map, graph or diagram that is not shown here, open the Study Guide single page app, go to
Library and find the actual CBSE question paper. The original papers are also available on the CBSE website:
cbse.gov.in.