MCQ
20841. The percentage of alumina in a good brick clay should vary from-
20 to 30%
30 to 40%
40 to 50%
50 to 60%
20842. For the construction of retaining walls, a------stone must be used.
soft
hard
heavy
light
20843. The percentage of the slag component of Portland-slag cement varies from-
10 to 40%
70 to 80%
40 to 70%
80 to 90%
20844. The average out-turn of first class bricks in clamp burning is about-
50%
60%
70%
80%
20845. The average out-turn of first class bricks in kiln burning is-
50 to 60%
60 to 70%
70 to 80%
80 to 90%
20846. The silica in Portland cement should be
10 to 20%
20 to 25%
25 to 40%
40 to 60%
20847. The compressive strength of paving bricks should not be less than-
20 MN/m²
30 MN/m²
40 MN/m²
50 MN/m²
20848. দুটি বালির নমুনার ওজন ও FM যথাক্রমে 500 গ্রাম ও 750 গ্রাম এবং 2.5 ও 2.2 হলে তাদের Combined FM কত হবে? [BPSC-20]
2.4
2.38
2.42
2.32
20849. The commonly used lime in white washing is---
quick lime
fat lime
lean lime
hydraulic lime
20850. The compressive strength of perforated bricks should not be less than-
4 MN/m²
5 MN/m²
6 MN/m²
7 MN/m²
20851. The frog of a brick is normally made on its-
longer face
bottom face
shorter face
top face
20852. The size of mould for bricks should be---- the specified size of the bricks.
equal to
double
smaller than
larger than
20853. The amount of gypsum usually added in the manufacture of cement is-
0.5 to 1%
3 to 5%
1 to 3%
0.1 to 0.5%
20854. The natural drying of bricks is also called back drying.
true
false
20855. Lime occurs in a free state in nature.
True
False
20856. The fuel generally used for burning limestone is
coalur
firewood
charcoal
any one of these
20857. For one cubic metre of brick masonry, the number of bricks required is-
400
450
500
550
20858. The burning of bricks in kilns is completed within-----hours.
12
24
48
96
20859. The cementing property in cement is mainly due to---
lime
silica
iron oxide
alumina
20860. The main constituent of Portland cement is-
lime
iron oxide
alumina
alkalies