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151.

If sea water is used for preparing concrete mix, it

A.	reduces strength	B.	corrodes steel reinforcement
C.	causes efflorescence	D.	all of these

152.

If mineral oil is present in mixing water for concrete, it increases strength for a concentration upto 2 percent.

Yes

153.

Which of the following statement is wrong?

A.	The coarse sand produces a harsh and unworkable mix.	B.	An admixture cannot increase the workability of concrete without increasing water content.
C.	Salts of manganese cause a considerable reduction in the strength of concrete.	D.	all of the above

154.

The standard sand now used in India is obtained from

A.	Ennore (Chennai)	B.	Mumbai
C.	Orissa	D.	Jaipur

155.

Insufficient quantity of water

A.	makes the concrete mix harsh	B.	makes the concrete mix unworkable
C.	causes segregation in concrete	D.	causes bleeding in concrete

156.

Excess quantity of water

A.	makes the concrete mix harsh	B.	makes the concrete mix unworkable
C.	causes segregation in concrete	D.	causes bleeding in concrete

157.

Water cement ratio may be defined as the ratio of

A.	volume of water to that of cement in a concrete mix	B.	weight of water to that of cement in a concrete mix
C.	volume of water to that of concrete in a concrete mix	D.	weight of water to that of concrete in a concrete mix

158.

The rule of water cement ratio was established by

A.	Duff Abram	B.	Plowman
C.	W. Simms	D.	Dr. Karl Terzaghi

159.

According to the rule of water cement ratio, the strength of concrete wholly depends upon

A.	the quality of cement	B.	the quality of cement mixed with aggregate
C.	the amount of water used in preparation of concrete mix	D.	all of the above

160.

The strength of cement concrete increases with the increase of water cement ratio.

Agree

Disagree