If the depth of an excavation is 20 meters, number of single stage well points to be installed at various levels, is

A wooden block hinged on post outside a door, is known

A. Cleat

B. Stop

C. Horn

D. None of these

The window which is provided in flat roof of a room, is known

A. Dormer window

B. Lantern window

C. Louvered window

D. Sky window

Weep holes are provided in retaining and breast walls

A. To drain off the water from the filling

B. To ventilate the stone masonry

C. To add architectural beauty

D. To increase compaction of the earth retained

The triangular space formed between the extrados and the horizontal line drawn through the crown of an arch is known as

A. Haunch

B. Spandril

C. Voussoirs

D. Skewbacks