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41.

Argillaceous materials contain

A.	calcium	B.	lime
C.	alumina

42.

Hydration of cement evolves heat.

True

False

43.

The proportion of lime, silica, alumina and iron oxide in a good Portland cement should be

A.	63 : 22 : 6 : 3	B.	62 : 22 : 3 : 6
C.	22 : 63 : 6 : 3	D.	22 : 63 : 3 : 6

44.

The chemical ingredient of cement which provides quick setting property to the cement is

A.	lime	B.	silica
C.	alumina	D.	iron oxide

45.

The presence of lime in cement

A.	makes the cement sound	B.	provides strength to the cement
C.	lowers the clinkering temperature	D.	all of these

46.

The gypsum is added to the cement for

A.	providing high strength to the cement	B.	controlling the initial setting time of cement
C.	lowering the clinkering temperature of cement	D.	all of the above

47.

Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly?

A.	Lime	B.	silica
C.	alumina	D.	iron oxide

48.

Lime when added in excess quantity

A.	makes the cement unsound	B.	cuses the cement to expand and disintegrate
C.	lowers the clinkering temperature of cement	D.	both (a) and (b)

49.

The magnesium oxide and sulphur dioxide when added in excess quantity makes the cement unsound.

Correct

Incorrect

50.

In order to provide colour, hardness and strength to the cement, the ingredient used is

A.	lime	B.	silica
C.	alumina	D.	iron oxide