500 Best Concrete Technology- MCQ
Q65). Initial setting time of ordinary portland cement is
a).15 minutes
b).30 minutes
c).60 minutes
d).10 hours
Correct Answer:
30 minutes
Explanation:
Q66). According to Indian standard specifications for the compressive strength test of cement, the cement and standard sand mortar in the ratio of ………. is used
a).0.0423611111111111
b).0.0430555555555556
c).0.04375
d).0.0444444444444444
Correct Answer:
0.04375
Explanation:
Q67). During field test, the cement is said to be pure and of good quality when
a).the colour of cement is uniformly greenish Grey
b).a handful of cement, thrown into a bucket of water, floats
c).hand is thrusted into a bag of cement, it feels cool
d).all of the above
Correct Answer:
all of the above
Explanation:
Q68). The inert mineral material used for the manufacture of mortars and concrete is
a).Cement
b).Water
c).Aggregate
d).Admixture
Correct Answer:
Aggregate
Explanation:
Q69). For reinforced concrete, the aggregate used is
a).sand
b).gravel
c).crushed rock
d).all of these
Correct Answer:
all of these
Explanation:
Q70). For the manufacture of concrete of low density, the aggregate used is
a).furnace clinker
b).coke breeze
c).saw dust
d).all of these
Correct Answer:
all of these
Explanation:
Q71). The material having particle size varying from 0.002 to 0.06 mm is termed as
a).silt
b).clay
c).sand
d).none of these
Correct Answer:
silt
Explanation:
Q72). The aggregate which pass through 75 mm IS sieve and entirely retain on 4.75 mm IS sieve is known as
a).cyclopean aggregate
b).coarse aggregate
c).fine aggregate
d).all in aggregate
Correct Answer:
coarse aggregate
Explanation: