MCQ
4221. The main constituent of Portland cement is-
lime
iron oxide
alumina
alkalies
4222. The fuel generally used for burning limestone is
coalur
firewood
charcoal
any one of these
4223. The compressive strength of paving bricks should not be less than-
20 MN/m²
30 MN/m²
40 MN/m²
50 MN/m²
4224. The normal consistency of Portland cement is about-
10%
15%
20%
25%
4225. For one cubic metre of brick masonry, the number of bricks required is-
400
450
500
550
4226. The compressive strength of ordinary cement is less than its tensile strength
right
wrong
4227. The commonly used lime in white washing is---
quick lime
fat lime
lean lime
hydraulic lime
4228. The percentage of the slag component of Portland-slag cement varies from-
10 to 40%
70 to 80%
40 to 70%
80 to 90%
4229. যদি বালুর FM ৩.০ হয় তবে উক্ত বালুকে বলা হয়-
very fine sand
fine sand
medium sand
flaky
4230. 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%
4231. The cementing property in cement is mainly due to---
lime
silica
iron oxide
alumina
4232. The moisture content in timber for framework should not exceed-
5%
10%
15%
20%
4233. The compressive strength of perforated bricks should not be less than-
4 MN/m²
5 MN/m²
6 MN/m²
7 MN/m²
4234. ইটের Herring-bone bond গাঁথুনি কোন কাজে ব্যবহৃত হয়?
Brick paving
Very thick wall
Partition walls
Footing foundation
4235. The silica in Portland cement should be
10 to 20%
20 to 25%
25 to 40%
40 to 60%
4236. The initial setting time of rapid hardening cement should not be less than--
30 min
4 hours
1 hour
10 hours
4237. Lime occurs in a free state in nature.
True
False
4238. The final setting time of ordinary cement should not be more than-
2 hours,
4 hours
4 hours
10 hours
4239. In brick field, pugmill is used for- [BPSC-22]
preparation of clay
drying of bricks
burning of bricks
moulding of bricks
4240. 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