Question

Which is false in case of a hollow cylinder?
(a) Curved surface area of a hollow cylinder = 2πh(R + r).
(b) Total surface area of a hollow cylinder = 2π(R + r)(h + R − r).
(c) Inner curved surface area of a hollow cylinder = 2 πh(R − r).
(d) Area of each end of a hollow cylinder = π(R² − r²).

Answer 1

(c) Inner curved surface area of a hollow cylinder = 2 πh(R − r)

Inner curved surface area of a hollow cylinder is $2\mathrm{\pi }rh$.