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141.

The maximum water-cement ratio for durable concrete is

A.	0.2	B.	0.4
C.	0.6	D.	0.8

142.

The durability of cement concrete is usually improved by

A.	increasing the quantity of coarse sand	B.	increasing the quantity of cement
C.	decreasing the water-cement ratio	D.	decreasing the proportion of fine aggregate

143.

The strength of cement concrete increases with

A.	increase in the size of aggregate	B.	increase in the temperature of water of curing
C.	increase in the size of aggreregate	D.	all of the above

144.

The density of concrete

A.	does not change	B.	increases
C.	decreases

145.

The strength of cement concrete is directly proportional to cement-water ratio.

Agree

Disagree

146.

The shrinkage of concrete

A.	is proportional to contents of cement	B.	is directly proportional to water contents at the time of mixing
C.	increases with increase in the percentage of concrete	D.	all of the above

147.

The shrinkage of concrete

A.	does not change	B.	increases
C.	decreases

148.

The shrinkage of ordinary concrete is about

A.	0.1 to 0.3 mm/m	B.	0.3 to 0.6 mm/m
C.	0.6 to 1.2 mm/m	D.	1.2 to 2.1 mm/m

149.

The coefficient of linear expansion of concrete is almost the same as that of steel.

Correct

Incorrect

150.

According to Indian standard specifications, the full strength of concrete is achieved after

A.	7 days	B.	14 days
C.	21 days	D.	28 days