Discussion
Match List I with List II and choose the correct answer from the given options.
| List-I | List-II |
|---|---|
| A. S.I. unit of power of a lens | 1. V |
| B. S.I. unit of electric potential difference | 2. Coulomb |
| C. Potential difference between two points | 3. Diopter |
| D. S.I. unit of electric charge | 4. W/Q |
Answer: D
The correct matching is A-3, B-1, C-4, D-2.
The power of a lens is measured in dioptres (A-3), the reciprocal of focal length in metres. The SI unit of potential difference is the volt, V (B-1). Potential difference between two points is the work done in moving a unit charge between them:
\[ V = \frac{W}{Q} \]
which is C-4. The SI unit of electric charge is the coulomb (D-2).
The trap is B and C: one asks for a unit (V) and the other for a definition (W/Q), and the distractors swap them.
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