MCQ
20881.
For one cubic metre of brick masonry, the number of bricks required is-
400
450
500
550
ব্যাখ্যা: [Note: মেট্রিক ইট 500টি লাগে।
20882.
The percentage of the slag component of Portland-slag cement varies from-
10 to 40%
70 to 80%
40 to 70%
80 to 90%
20883.
The time required for seasoning of timber in kiln seasoning is-
2 to 5 days
5 to 10 days
10 to 20 days
20 to 40 days
20884.
The initial setting time of rapid hardening cement should not be less than--
30 min
4 hours
1 hour
10 hours
20885.
Lime occurs in a free state in nature.
True
False
20886.
The compressive strength of paving bricks should not be less than-
20 MN/m²
30 MN/m²
40 MN/m²
50 MN/m²
20887.
The compressive strength of perforated bricks should not be less than-
4 MN/m²
5 MN/m²
6 MN/m²
7 MN/m²
20888.
The moisture content in timber for framework should not exceed-
5%
10%
15%
20%
20889.
The main constituent of Portland cement is-
lime
iron oxide
alumina
alkalies
20890.
The burning of bricks in kilns is completed within-----hours.
12
24
48
96
20891.
The commonly used lime in white washing is---
quick lime
fat lime
lean lime
hydraulic lime
20892.
The cementing property in cement is mainly due to---
lime
silica
iron oxide
alumina
20893.
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%
20894.
The compressive strength of ordinary cement is less than its tensile strength
right
wrong
20895.
The average out-turn of first class bricks in kiln burning is-
50 to 60%
60 to 70%
70 to 80%
80 to 90%
20896.
The normal consistency of Portland cement is about-
10%
15%
20%
25%
20897.
The final setting time of ordinary cement should not be more than-
2 hours,
4 hours
4 hours
10 hours
20898.
The fuel generally used for burning limestone is
coalur
firewood
charcoal
any one of these
20899.
The silica in Portland cement should be
10 to 20%
20 to 25%
25 to 40%
40 to 60%
ব্যাখ্যা: ব্যাখ্যা: ১। ক্যালসিয়াম অক্সাইড (CaO)..........63%
২। ম্যাগনেশিয়াম অক্সাইড (MgO)..........2%
৩। সিলিকা (SiO₂)..........22%
৪। অ্যালুমিনা (Al2O3)..........7%
৫। আয়রন অক্সাইড (Fe2O3)..........3%
৬। সালফার ট্রাই-অক্সাইড (SO3).........2%
৭। ক্ষারকীয় পদার্থ...........1%
........ মোট 100%
20900.
ইটের Herring-bone bond গাঁথুনি কোন কাজে ব্যবহৃত হয়?
Brick paving
Very thick wall
Partition walls
Footing foundation