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61.

When the depth of water is from 4.5 to 6 m, the type of coefferdam used is

A.	earthen cofferdam	B.	rockfill cofferdam
C.	single-walled cofferdam	D.	double walled cofferdam

62.

A wateright structure constructed in connection with excavations for foundations of bridges, piers etc., is known as

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

63.

The minimum depth of foundation for the load bearing wall of a building is restricted to

A.	600 mm	B.	700 mm
C.	800 mm	D.	900 mm

64.

In order that the wall may be stable, the lowermost course of the wall footing is made

A.	half	B.	equal to
C.	twice	D.	four times

65.

The dampness in a building is due to

A.	ground moisture	B.	rain water
C.	defective construction	D.	all of these

66.

The dampness on roof may be due to

A.	use of porous materials	B.	insufficient lap of covering material
C.	bad workmanship in plumbing	D.	all of these

67.

The most commonly used material for damp proofing is

A.	bitumen	B.	paraffin wax
C.	cement solution	D.	cement concrete

68.

In case of buildings without basement, the best position for damp-proof course (D.P.C.) lies at

A.	plinth level	B.	ground level
C.	150 mm above plinth level	D.	150 mm above ground level

69.

For D.P.C. at plinth level, the commonly adopted material is

A.	bitumen sheeting	B.	plastic sheeting
C.	mastic asphalt	D.	cement concrete

70.

A semi-rigid material which forms an excellent impervious layer for damp-proofing, is called

A.	bitumen	B.	mastic asphalt
C.	aluminal	D.	bituminous felt