500 Best Concrete Technology- MCQ
Q81). The aggregate is said to be elongated when
a).its least dimension is three fifth of its mean dimension
b).its least dimension is equal to its mean dimension
c).its length is equal to its mean dimension
d).its length is equal to 1.8 times its mean dimension
Correct Answer:
its length is equal to 1.8 times its mean dimension
Explanation:
Q82). If the aggregate completely passes through a 50 mm sieve and retained on 40 mm sieve, then the particular aggregate is said to be flaky if its least dimension is less than
a).27 mm
b).37 mm
c).47 mm
d).57 mm
Correct Answer:
27 mm
Explanation:
Q83). The value of bulk density of aggregate depends upon
a).size distribution of aggregate
b).shape of aggregate
c).specific gravity of aggregate
d).all of these
Correct Answer:
all of these
Explanation:
Q84). An aggregate which may contain some moisture in the pores but having dry surface is known as
a).very dry aggregate
b).dry aggregate
c).saturated surface dry aggregate
d).most aggregate
Correct Answer:
dry aggregate
Explanation:
Q85). An aggregate having all the pores filled with water but having dry surface is called
a).very dry aggregate
b).dry aggregate
c).saturated surface dry aggregate
d).most aggregate
Correct Answer:
saturated surface dry aggregate
Explanation:
Q86). A moist aggregate is one
a).whose all the pores are filled with water and also having its surface wet
b).whose all the pores are filled with water but having its surface dry
c).which do not contain any moisture either in the pores or on the surface
d).which may contain some moisture in the pores but having dry surface
Correct Answer:
whose all the pores are filled with water and also having its surface wet
Explanation:
Q87). The deleterious materials present in the aggregate
a).prevent normal hydration of cement
b).reduce the strength and durability of concrete
c).modify the setting action and cause efflorescence
d).all of the above
Correct Answer:
all of the above
Explanation:
Q88). The sum of percentages of all deleterious materials in the aggregate shall not exceed
a).0.05
b).0.1
c).0.15
d).0.2
Correct Answer:
0.05
Explanation: