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81.

The hardening is the phenomenon by virtue of which

A.	the cement does not undergo large change in volume when treted with water	B.	the plastic cement paste changes into hard mass
C.	the cement paste sets and develops strength	D.	none of the above

82.

The phenomenon by virtue of which the cement does not undergo large change in volume when treated with water, is known as

A.	fineness	B.	soundness
C.	setting time	D.	none of these

83.

The fineness of cement is measured in terms of

A.	percentage weight retained on IS sieve number 9	B.	surface area in cm2 per gram of the cement
C.	either (a) or (b)	D.	none of these

84.

Too much finencess of cement

A.	results cracks in concrete	B.	generates greater heat
C.	develops early strength	D.	both (a) and (b)

85.

The setting time of cement is the governing factor for

A.	mixing of concrete	B.	placing of concrete
C.	compaction of concrete	D.	all of these

86.

According to IS : 269 - 1976, the requirement of an ordinary Portland cement is that

A.	the residue does not exceed 10% when sieved through IS sieve No. 9	B.	its expansion is not more than 10 mm for unaerated cement
C.	its initial setting time is not less than 30 minutes	D.	all of the above

87.

The compressive strength of an ordinary Portland cement (1 : 3 cement mortar cube) after 7 days test should not be less than

A.	11 N/mm2	B.	17.5 N/mm2
C.	22 N/mm2	D.	27.5 N/mm2

88.

Vicat's apparatus is used to perform

A.	fineness test	B.	soundness test
C.	consistency test	D.	compressive strength test

89.

The knowledge of a standard consistency of a cement paste is essential to perform

A.	setting time test	B.	soundness test
C.	compressive strength test	D.	all of these

90.

In Vicat's apparatus, the diameter of Vicat plunger is

A.	5 mm	B.	10 mm
C.	15 mm	D.	20 mm