The brick work is measured in sq metre, in case of

The most reliable estiamte is

An imaginary line joining the points of equal elevation on the surface of the earth, represents

Pick up the correct statement from the following:

The cracks which extend from bark towards the sap wood in the cross section of a tree, are called

Lime mortar is generally made with

An ordinary concrete may be made water proof by adding

Wing rails are provided

Width of the top portion of a flat footed, rail, is

Ballast packed below and around the sleepers to transfer the load from sleepers to formation, generally consists of