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51.

A screw pile consists of cast iron or steel shaft of external diameter varying from

A.	0 to 150 mm	B.	150 to 300 mm
C.	300 to 450 mm	D.	450 to 600 mm

52.

Sheet piles are made of

A.	wood	B.	steel
C.	concrete	D.	all of these

53.

The coefficient of friction between the concrete and soil is

A.	0.20 to 0.25	B.	0.25 to 0.30
C.	0.30 to 0.35	D.	0.35 to 0.50

54.

When the pile is required to penetrate beds of hard soil or soft rock to reach its required depth, the best method od driving the pile is by

A.	drop hammer	B.	steam hammer
C.	water jets	D.	boring

55.

When the pile is driven by means of water jets, water is forced through the jet pipe under a pressure of

A.	0.2 to 0.5 N/mm2	B.	0.5 to 0.7 N/mm2
C.	0.7 to 1.75 N/mm2	D.	1.75 to 2.5 N/mm2

56.

The centre to centre spacing of lateral reinforcement in pre-cast reinforced concrete piles should not exceed

A.	half	B.	equal to
C.	double	D.	three times

57.

For the pre-cast reinforced concrete piles, the quality of concrete recommended is

A.	M 100 to M 150	B.	M 150 to M 200
C.	M 200 to M 250	D.	M 250 to M 300

58.

In the pre-cast reinforced concrete piles, the thickness of concrete covering the main bars should not be less than

A.	40 mm	B.	55 mm
C.	75 mm	D.	100 mm

59.

The minimum covering of the reinforcement for the pre-cast reinforced piles used in sea water, is

A.	40 mm	B.	55 mm
C.	75 mm	D.	100 mm

60.

A tomparary structure constructed in a river for excluding water from a given site to enable the building operation to be performed on dry surface, is called

A.	caisson	B.	cofferdam
C.	well foundation	D.	raft foundatio