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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] straightforward exam-ready
Assertion (A): The direction of conventional electric current in a metallic conductor is taken opposite to the direction of flow of electrons. Reason (R): Electrons were not known when the phenomenon of electricity was first studied, so current was assumed to flow from positive to negative terminal. (A) Both A and R are true and R is the correct explanation of A. (B) Both A and R are true but R is not the correct explanation of A. (C) A is true but R is false. (D) A is false but R is true.
  1. A Both A and R are true and R is the correct explanation of A.
  2. B Both A and R are true but R is not the correct explanation of A.
  3. C A is true but R is false.
  4. D A is false but R is true.
Generated by claude-sonnet-4-6 · 2026-06-26 01:09 · grounding rag
Model Answer

(A) Both A and R are true and R is the correct explanation of A.

Electrons were not known when electricity was first studied, so current was assumed to flow from positive to negative terminal. Hence, conventional current is taken opposite to electron flow.

Explanation

The textbook (Chapter 11, Section 11.1) explicitly states: "electrons were not known at the time when the phenomenon of electricity was first observed, so electric current was considered to be the flow of positive charges." This directly explains why conventional current is opposite to electron flow — making R the correct explanation of A. Choose option (A).

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