Question : A cylindrical pillar is 84 cm in diameter and 5 m in height. Find the cost of painting the curved surface of the pillar at the rate of INR 15 per m². (Use $\pi=\frac{22}{7}$)

Option 1: INR 198

Option 2: INR 184

Option 3: INR 208

Option 4: INR 216

Question : A hemispherical dome of a building needs to be painted. If the circumference of the base of the dome is 154 cm, then find the cost of painting it if the cost of painting is INR 4 per 100 cm². (Use$ ~\pi=\frac{22}{7}$).

Option 1: INR 150.92

Option 2: INR 150.66

Option 3: INR 105.29

Option 4: INR 105.66

Question : The curved surface area of a right circular cone of diameter $42 \ \text{cm}$ is $990 \ \text{cm}^2$. What is the slant height (in${\ \text{cm}})$ of the cone? [Use $\pi=\frac{22}{7}$]

Option 1: 10

Option 2: 15

Option 3: 24

Option 4: 12

Question : If the curved surface area of a cylinder is 1386 sq cm and the height is 21 cm, what will be its radius? (Take $\pi=\frac{22}{7}$)

Option 1: 21 cm

Option 2: 5.25 cm

Option 3: 10.5 cm

Option 4: 15.75 cm

Question : The radius and slant height of a cone are in the ratio 5 : 7. If its curved surface area is 1347.5 cm², find its radius. $\mathrm{(Use ~\pi =\frac{22}{7})}$

Option 1: 15 cm

Option 2: 25.5 cm

Option 3: 17.5 cm

Option 4: 21 cm

Question : The total surface area of a solid hemisphere of diameter 14 cm is (use $\pi=\frac{22}{7}$ ):

Option 1: 522 cm²

Option 2: 462 cm²

Option 3: 428 cm²

Option 4: 584 cm²