Pick up the correct statement from the following?

A. In a gully trap, a water seal of 6 to 7.5 cm is provided
B. The gully trap collects waste water from the kitchen, sink, wash basins, etc.
C. The gully trap disconnects the sullage drain from the main drainage system
D. The grating provided over gully traps is 23 cm square

Pick up the incorrect statement from the following?

A. The built up covered area at the floor level of any storey of a building is called plinth area
B. The usable covered area of the rooms of any storey of a building is called carpet area
C. The carpet area of a building along with area of its kitchen, pantry, store, lavatory, bath room and glazed veranda, is called floor area
D. None of these

Pick up the correct statement from the following?

A. All pipes and fittings are classified according to their diameters
B. The diameter of the pipes is the nominal diameter of internal bore
C. All pipes are measured along the centre line of the pipes in metres
D. All the above

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