VIVA Questions on Construction Engineering Multiple choice Questions and Answers

71. For testing compressive strength of cement, the size of cube used is
a)    50 mm
b)    70.6 mm
c)    100 mm
d)    150 mm
 Ans: a

72.    The normal consistency of ordinary Portland cement is about
a)    10%
b)    20%
c)    30%
d)    40%
Ans: c

73.    Early attainment of strength in rapid hardening cement is mainly due to
a)    gypsum
b)    finer grinding
c)    tricalcium silicate
d)    tricalcium aluminate
Ans: b

74.    After storage, the strength of cement
a)    decreases
b)    increases
c)    remains same
d)    may increase or decrease
Ans: a

75.    According to IS specifications, the compressive strength of ordinary portland cement after three days should not be less than
a)    7 MPa
b)    11.5 MPa
c)    16 MPa
d)    21 MPa
Ans: c

76.    Addition of pozzolana to ordinary Portland cement increases
a)    bleeding
b)    shrinkage
c)    permeability
d)    heat of hydration
Ans: b

77.    Gypsum consists of
a)    H2S and C02
b)    CaS04 and H20
c)    Lime and H20
d)    C02 and calcium
Ans: b

78.    For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
a)    1:2
b)    1:3
c)    1:4
d)    1:6
 Ans: b

79.    The slump recommended for mass concrete is about
a)    25 mm to 50 mm
b)    50 mm to 100 mm
c)    100 mm to 125 mm
d)    125 mm to 150 mm
Ans: a

80.    With increase in moisture content, the bulking of sand
a)    increases
b)    decreases
c)    first increases to a certain maximum value and then decreases
d)    first decreases to a certain minimum value and then increases
Ans: c
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