150 TOP Construction Engineering Multiple choice Questions and Answers pdf free download

41.    A first class brick when immersed in cold water for 24 hours should not absorb water more than
a)    15%
b)    20%
c)    22%
d)    25%
Ans: b

42.    Crushing strength of a first class brick should not be less than
a)    3.5 N/mm2
b)    7.0 N/mm2
c)    10.5 N/mm2
d)    14.0 N/mm2
Ans: c

43.    The main function of alumina in brick earth is
a)    to impart plasticity
b)    to make the brick durable
c)    to prevent shrinkage
d)    to make the brick impermeable
Ans: a

44.    The percentage of alumina in a good brick earth lies between
a)    5 to 10%
b)    20 to 30%
c)    50 to 60%
d)    70 to 80%
Ans: b

45.    Excess of alumina in brick earth makes the brick
a)    impermeable
b)    brittle and weak
c)    to lose cohesion
d)    to crack and warp on drying
Ans: d

46.    The nominal size of the modular brick is
a)    190 mm x 90mmx 80 mm
b)    190 mm x 190 mm x 90 mm
c)    200 mm x 100 mm x 100 mm
d)    200 mm x 200 mm x 100 mm
Ans: c

47.    Percentage of silica in a good brick earth lies between
a)    5 to 10%
b)    20 to 30%
c)    50 to 60%
d)    70 to 80%
Ans: c

48.    Excess of silica in brick earth results in
a)    cracking and warping of bricks
b)    loss of cohesion
c)    enhancing the impermeability of bricks
d)    none of the above
Ans: b

49.    Which of the following ingredients of the brick earth enables the brick to retain its shape ?
a)    alumina
b)    silica
c)    iron
d)    magnesia
Ans: b

50.    Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a
good brick earth ?
a)    lime stone and alumina
b)    silica and alkalies
c)    alumina and iron
d)    alkalies and magnesium
Ans: b
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