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131.

The expansion in Portland cement can be tested by

A.	fineness test	B.	soundness test
C.	setting time test	D.	normal consistency test

132.

The specific surface (in cm2/g) of a good Portland cement should not be less than

A.	500	B.	100
C.	2250	D.	3200

133.

The expansion of Portland cement is caused by

A.	free lime	B.	magnesia
C.	silica	D.	both (a) and (c)

134.

The compressive strength of a good Portland cement and standard sand mortar after 3 days of curing should not be less than

A.	7 MN/m2	B.	11.5 MN/m2
C.	17.5 MN/m2	D.	21 MN/m2

135.

The sand is mixed with lime mortar to

A.	reduce cost	B.	reduce setting time
C.	improve strength	D.	prevent shrinkage and cracking

136.

Which of the following statement is correct?

A.	The sand used for making mortar should be fine.	B.	The rounded grains of sand produce a strong mortar.
C.	The mortar made with coarse sand is stronger than the one made with fine stand.	D.	all of the above

137.

For R.C.C. construction, the maximum size of coarse aggregate is limited to

A.	10 mm	B.	15 mm
C.	20 mm	D.	25 mm

138.

The bulking of sand

increases

decreases

139.

The workability of cement concrete can be improved by

A.	increasing the quantity of cement	B.	increasing the proportion of coarse aggregate
C.	increasing the quantity of sand	D.	all of the above

140.

The durability of concrete is proportional to

A.	sand content	B.	water-cement ratio
C.	cement-aggregate ratio	D.	aggregate-water ratio