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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] deep exam-ready
Assertion (A): An electric fuse is connected in series with the live wire of a domestic circuit. Reason (R): If the fuse were connected to the neutral wire, it would still protect appliances from overloading and short-circuiting equally well. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.
  1. A Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  2. B Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
  3. C Assertion (A) is true, but Reason (R) is false.
  4. D Assertion (A) is false, but Reason (R) is true.
Generated by claude-sonnet-4-6 · 2026-06-26 01:10 · grounding rag
Model Answer

(C) Assertion (A) is true, but Reason (R) is false.

The fuse must be on the live wire so that when it blows, the appliance is disconnected from the high-potential wire, making it safe to touch. A fuse on the neutral wire would leave the appliance connected to the live wire even after blowing.

Explanation

The Assertion is correct as per the textbook (Section 12.4). The Reason is false because connecting the fuse to the neutral wire does NOT provide equal protection — the appliance would still remain at a high (live) potential after the fuse melts, posing a shock hazard. Examiners expect students to identify this safety distinction.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.