The volume of a hemisphere is 2425 $\frac{1}{2}$ cm^3. Find its curved surface area. 

$\left[\mathrm{Use} \mathrm{\pi } = \frac{22}{7}\right]$

From a solid cylinder of height 7 cm and base diameter 12 cm, a conical cavity of same height and same base diameter is hollowed out. Find the total surface area of the remaining solid.  $\left[\mathrm{Use} \mathrm{\pi } = \frac{22}{7}\right]$

                                    OR

A cylindrical bucket, 32 cm high and with radius of base 18 cm, is filled with sand. This bucket is emptied on the ground and a conical heap of sand is formed. If the height of the conical heap is 24 cm, then find the radius and slant height of the heap.

A bucket is in the form of a frustum of a cone and its can hold 28.49 litres of water. If the radii of its circular ends are 28 cm and 21 cm, find the height of the bucket. $\left[\mathrm{use} \mathrm{\pi } = \frac{22}{7}\right]$

744.

A solid is in the shape of a cone standing on a hemisphere with both their radii being equal to 7 cm and the height of the cone is equal to its diameter. Find the volume of the solid.

$\left[\mathrm{Use} \mathrm{\pi }= \frac{22}{7}\right]$