Savitri had to make a model of a cylindrical kaleidoscope for her science project.
She wanted to use chart paper to make the curved surface of the kaleidoscope.
What would be the area of chart paper required by her, if she wanted
to make a kaleidoscope of length 25 cm with a 3.5 cm radius?

A cistern 6m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is:

The curved surface area of a cylindrical pillar is 264 $m^2$ and its volume is 924 $m^3$. Find the ratio of its diameter to its height.

A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/$cm^3$, then the weight of the pipe is:

A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is:

50 men took a dip in a water tank 40 m long and 20 m broad on a religious day. If the average displacement of water by a man is $4 m^3$, then the rise in the water level in the tank will be:

Calculate the volume of a cone with radius 5cm and height 12cm

The cost of the paint is Rs. 36.50 per kg. If 1 kg of paint covers 16 square feet, how much will it cost to paint outside of a cube having 8 feet each side.

Calculate the volume of a sphere with radius 6cm.

How many cubes of 10 cm edge can be put in a cubical box of 1 m edge.