The correct option is (A) 2.6 cm2.
Explanation:
Least count = {(1 mm) / (100)} = 0.01 mm
Diameter of wire = 1 mm + (47 × 0.01 mm)
∴ d = 1.47 mm
curved surface area = 2πrℓ
= 2π(d / 2)ℓ
= πdℓ
= π × 1.47 × 10–1 × 5.6
= 2.5848 cm2
= 2.6 cm2 (in two significant digits).