Convert into metres :
7 nm (diameter of small virus)

In Fig. 12.27, AB and CD are two diameters of a circle (with centre O) perpendicular to each other and OD is the diameter of the smaller circle. If OA = 7 cm, find the area of the shaded region.

A galvanometer coil has a resistance of 15Omega and the metre shows full scale deflection for a current of 4mA. How will you convert the metre into an ammmeter of range 0 to 6 A?

A lead pencil consists of a cylinder of wood with a solid cylinder of graphite filled in the interior. The diameter of the pencil is 7 mm and diameter of graphite is 1 mm. If the length of the pencil is 14 cm, find the volumes of the wood and that of the graphite.

A solid lead ball of radius 7 cm is melted is converted into a wire of diameter 0.2 cm. find its length of the wire.

A galvanometer coil has a resistance of 12 Omega and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V?

The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as

When the planet Jupiter is at a distance of 824.7 million kilometers from the Earth, its angular diameter is measured to be 35.72” of arc. Calculate the diameter of Jupiter.

A solid is in the form of a cylinder with hemispherical ends. The total height of the solid is 19 cm and the diameter of the cylinder is 7 cm. Find the surface area of the solid.