Correct option is D
Rail gauge:
The rail gauge of a railway track is defined as the clear minimum perpendicular distance between the inner faces of the two rails of a rail track.
Rail gauge:
The rail gauge of a railway track is defined as the clear minimum perpendicular distance between the inner faces of the two rails of a rail track.
The minimum density (g/cc) of corrugated and semi-corrugated asbestos cement sheets considered acceptable for construction purposes by the Indian standard is: