A shopkeeper has one spherical laddoo of radius 5 cm. With the same amount of material how many laddoos of radius 2.5 cm can made?

A shopkeeper has one spherical laddoo of radius 5cm. Which the same amount of meterial. How many laddoos of radius 2.5cm can be made?

A hemispherical bowl has a radius of 3.5 cm What would be the volume of water it would contains?

Electric charge are distributed in a small volume. The flux of the electric field through a spherical surface of radius 10cm surrounding the total charge is 25 V m. The flux over a concentric sphere of radius 20 cm will be

Plastic drum of cylinder shape is made by melting spherical solid plastic balls of radius 1cm Find the number of balls required to make a drum of thickness 2cm, height 90 cm and outer radius 30cm.

The radius of sphere is 3.5 cm Find its surface area and volume .

A hemispherical bowl is made of brass .0.25 cm. thickness .The inner radius of the bowl is 5cm. Find the ratio of outer surface area to inner surface area.

A spherical ball of iron has been melted and made into small balls. If the radius of each smaller ball is one-fourth of the radius of the original one, how many such balls can be made ?

If the radius of the sphere, with radius 5 cm, has to increase by 0.1 cm approximately. How much will its volume increase ?

A biconvex lens has radius of curvature 20 cm each. If the refractive index of the material of the lens is 1.5, what is its focal length?