Question : The height and curved surface area of a right circular cylinder are $7~\text{cm}$ and $70\pi~\text{cm}^2$. Its total surface area is:

Option 1: $140 \pi~\text{cm}^2$

Option 2: $150 \pi~\text{cm}^2$

Option 3: $180 \pi~\text{cm}^2$

Option 4: $120 \pi~\text{cm}^2$

Question : When the radius of a sphere is increased by 5 cm, its surface area increases by 704 cm². The diameter of the original sphere is _________. (Take $\pi=22 / 7$ )

Option 1: 8.2 cm

Option 2: 6.8 cm

Option 3: 5.2 cm

Option 4: 6.2 cm

Question : The radius of the base of a solid right circular cone is 8 cm and its height is 15 cm. The total surface area of the cone is:

Option 1: 200$\pi$

Option 2: 120$\pi$

Option 3: 136$\pi$

Option 4: 128$\pi$

Question : The total surface area of a cone whose radius is 3 cm and height is 4 cm is:

Option 1: $\frac{425}{7} \mathrm{~cm}^2$

Option 2: $\frac{501}{9} \mathrm{~cm}^2$

Option 3: $\frac{475}{8} \mathrm{~cm}^2$

Option 4: $\frac{528}{7} \mathrm{~cm}^2$

Question : What will be the difference between the total surface area and the curved surface area of a hemisphere having a 4 cm diameter in cm²?

Option 1: $5\pi $

Option 2: $8\pi $

Option 3: $4\pi $

Option 4: $4.4\pi $