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MCQs 1: The property of the ingredients to separate from each other while placing the concrete is called____________?

segregation compaction shrinkage bulking
Answer Explanation

MCQs 2: Approximate value of shrinkage strain in concrete, is________________?

0.003 0.0003 0.00003 0.03
Answer Explanation

MCQs 3: Workability of concrete is directly proportional to________________?

aggregate cement ratio time of transit grading of the aggregate all of above
Answer Explanation

MCQs 4: The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by_______________?

tcr – rcs = tct fcr>fcs>fc fcr fc5>fcr>fC
Answer Explanation

MCQs 5: Strength of concrete increases with________________?

increase in water-cement ratio increase in fineness of cement decrease in curing time decrease in size of aggregate
Answer Explanation

MCQs 6: As compared to ordinary portland cement, use of pozzuolanic cement_______________?

reduces workability increases bleeding increases shrinkage increases strength
Answer Explanation

MCQs 7: According to IS : 456 -1978, the modulus of elasticity of concrete Ec (in N/mm2) can be taken as______________?

Ec = = 5700 Ec = = 570 Ec = = 5700fck Ec = where fck N/mm2 = 700 is the characteristic strength in
Answer Explanation

MCQs 8: The most commonly used admixture which prolongs the setting and hardening time is_______________?

gypsum calcium chloride sodium silicate all of the above
Answer Explanation

MCQs 9: The strength of concrete after one year as compared to 28 days strength is about_______________?

10 to 15% more 15 to 20% more 20 to 25% more 25 to 50% more
Answer Explanation

MCQs 10: Admixtures which cause early setting, and hardening of concrete are called_______________?

workability admixtures accelerators retarders air entraining agents
Answer Explanation

MCQs 11: Increase in the moisture content in concrete_________________?

reduces the strength increases the strength does not change the strength all of the above
Answer Explanation

MCQs 12: The relation between modulus of rupturefcr and characteristic strength of concrete fck is given by_______________?

fcr=0.35Vf7 fcr=0.57f7 fcr=0.7Vf7 fcr=1.2Vf7
Answer Explanation

MCQs 13: The approximate value of the ratio between direct tensile strength and flexural strength is_____________?

0.33 0.5 0.75 1.0
Answer Explanation

MCQs 14: Air entrainment in the concrete increases________________?

workability strength the effects of temperature variations the unit weight
Answer Explanation

MCQs 15: Workability of concrete is inversely pro¬portional to______________?

time of transit water-cement ratio the air in the mix size of aggregate
Answer Explanation

MCQs 16: The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called________________?

segregation bleeding bulking creep
Answer Explanation

MCQs 17: To determine the modulus of rupture, the size of test specimen used is_______________?

150 x150 x500 mm 100 x100 x700 mm 150 x150 x700 mm 100 x100 x500 mm
Answer Explanation

MCQs 18: The percentage of voids in cement is approximately_______________?

25% 40% 60% 80%
Answer Explanation

MCQs 19: Modulus of rupture of concrete is a measure of_______________?

flexural tensile strength direct tensile strength compressive strength split tensile strength
Answer Explanation

MCQs 20: In order to obtain the best workability of concrete, the preferred shape of aggregate is_______________?

rounded elongated angular all of the above
Answer Explanation

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