401. Air entrainment in the concrete increases________________?
A. workability
B. strength
C. the effects of temperature variations
D. the unit weight

402. Workability of concrete is inversely proportional to______________?
A. time of transit
B. ‘vater-cement ratio
C. the air in the mix
D. size of aggregate

403. The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called________________?
A. segregation
B. bleeding
C. bulking
D. creep

404. To determine the modulus of rupture, the size of test specimen used is_______________?
A. 150 x150 x500 mm
B. 100 x100 x700 mm
C. 150 x150 x700 mm
D. 100 x100 x500 mm

405. The percentage of voids in cement is approximately_______________?
A. 25%
B. 40%
C. 60%
D. 80%

406. Modulus of rupture of concrete is a measure of_______________?
A. flexural tensile strength
B. direct tensile strength
C. compressive strength
D. split tensile strength

407. In order to obtain the best workability of concrete, the preferred shape of aggregate is_______________?
A. rounded
B. elongated
C. angular
D. all of the above

408. As compared to ordinary portland cement, high alumina cement has______________?
A. higher initial setting time but lower final setting time
B. lower initial setting time but higher final setting time
C. higher initial and final setting times
D. lower initial and final setting times

409. Bulking of sand is maximum if moisture content is about____________?
A. 2 %
B. 4%
C. 6%
D. 10%

410. 1% of voids in a concrete mix would reduce its strength by about______________?
A. 5%
B. 10 %
C. 15%
D. 20%

NOTE
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PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
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