What materials are used in construction?

Refractory metals are used in construction of furnances because

A piller 14 cm in diameter is 5 m high. How much material was used to construct it?

In highly seismic areas, what material should be used for construction of houses.

An open tank of square base is to be constructed which has a given quantity of water. Prove that for least material used for the construction of tank, the depth will be half of the width of tank.

Assertion: Material used in the construction of a standard resistance is constantan or manganin. Reason: Temperatures coefficient of constan is very small.

If the materials used for constructing a building were good conductors, do you think lightning will strike the building. Will the lightning conductor be still required to be installed in the building?

Statement I : Material used in the construction of a standard resistance is constantan or manganin. Statement II : Its temperature coefficient of resistance is very small.

The materials for the construction of electromagnet should have