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Q29 (NDA-II/2012) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

Which one among the following is the true representation of (i) variable DC potential (ii) rheostat and (Hi) AC ammeter respectively?

Result
Your answer: —  Â·  Correct: A
Explanation

The circuit symbols for electrical components are standardized to ensure clarity in schematic diagrams. A variable DC potential (or variable voltage source) is represented by the standard DC battery symbol (parallel long and short lines) with a diagonal arrow across it, indicating adjustability [1]. A rheostat, which is a two-terminal variable resistor used to control current, is represented by a zig-zag line (IEEE) or a rectangle (IEC) with a diagonal arrow or a sliding contact arrow [1]. An AC ammeter is represented by a circle containing the letter 'A' with a tilde (~) symbol underneath or inside it, where the tilde denotes alternating current (AC). Option 1 correctly aligns these three symbols in the specified order: variable DC source, rheostat, and AC ammeter.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > 11.3 CIRCUIT DIAGRAM > p. 175
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