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Match the devices in List-I with their working principle/function in List-II. List-I (A) AC generator (B) Galvanometer (C) Transformer (D) Metal detector List-II (I) Indicates the presence of a current in a circuit (II) Transforms mechanical energy into electrical energy (III) Operates using resonance in an AC circuit (IV) Steps an alternating voltage up or down Select the correct matching:

1. (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
2. (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
3. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
4. (A)-(III), (B)-(I), (C)-(II), (D)-(IV)

Correct answer: (A)-(II), (B)-(I), (C)-(IV), (D)-(III)

Solution

Each device matches a distinct principle. AC generator -> rotating coil in a magnetic field converts mechanical to electrical energy (II). Galvanometer -> detects/indicates current (I). Transformer -> steps voltage up or down (IV). Metal detector -> works on resonance of an AC (LC) circuit (III).

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