SSC CHSL 2024 PYQ — Question 71

The correct answer is option 1 i.e. 660 cm².

Given that, diameter of base = 14 cm

⇒ Radius = 14/2 = 7 cm

CSA of cylinder = 352 cm² 

CSA of cylinder = $2 \pi r h$

TSA of cylinder = $2 \pi r(r + h)$

According to the given question,

⇒ $2 \pi r h$ = 352

⇒ $2 \times {22 \over 7} \times 7 \times h$ = 352

⇒ h = 8 cm

TSA = $2 \times {22 \over 7} \times 7(7 + 8)$

⇒ TSA = 2 × 22 × 15

⇒ TSA = 660

Hence the total surface area of the cylinder is 660 cm².