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51.

The permeability of moulding sand depends on

A.	grain size	B.	grain shape
C.	moisture content	D.	all of the above

52.

By compacting the sand

A.	density increases and permeability	B.	density decreases and permeability increases
C.	both density as well as permeability decrease	D.	both density as well as permeability increase

53.

As the moisture content of sand increases

A.	permeability increases	B.	permeability decreases
C.	permeability remains unchanged

54.

Permeability of sand decreases as

A.	permeability increases	B.	moisture content increases
C.	bonding content increases	D.	all of the above

55.

The sand mass does not fall out of the moulding box but is held firmly in it when the moulding box is lifted. This is due to the property of

A.	porosity of sand	B.	adhesiveness of sand
C.	refractoriness of sand	D.	plasticity of sand

56.

Cohesiveness of sand depends on

A.	grain size and shape of sand particles	B.	bonding material
C.	moisture content	D.	all of the above

57.

Sand acquires a predetermined shape under pressure and retains the same when pressure is removed. This is due to the property of sand known as

A.	Cohesiveness	B.	Plasticity
C.	Refractoriness	D.	none of the above

58.

The property of sand to withstand the high temperature of the molten metal without fusing or breakdown is known as

A.	refractoriness	B.	cohesiveness
C.	porosity	D.	adhesiveness

59.

Clay content of green sand is usually

A.	1 to 3 percent	B.	5 to 10 percent
C.	18 to 30 percent	D.	30 to 50 percent

60.

The water content of green sand is usually

A.	1 to 2 percent	B.	6 to 8 percent
C.	12 to 18 percent	D.	20 to 25 percent