ইঞ্জিনিয়ারিং মেটেরিয়ালস MCQ
321. 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
322. In brick field, pugmill is used for- [BPSC-22]
preparation of clay
drying of bricks
burning of bricks
moulding of bricks
323. যদি বালুর FM ৩.০ হয় তবে উক্ত বালুকে বলা হয়-
very fine sand
fine sand
medium sand
flaky
324. For one cubic metre of brick masonry, the number of bricks required is-
400
450
500
550
325. The initial setting time of rapid hardening cement should not be less than--
30 min
4 hours
1 hour
10 hours
326. The final setting time of ordinary cement should not be more than-
2 hours,
4 hours
4 hours
10 hours
327. The compressive strength of paving bricks should not be less than-
20 MN/m²
30 MN/m²
40 MN/m²
50 MN/m²
328. The cementing property in cement is mainly due to---
lime
silica
iron oxide
alumina
329. The percentage of the slag component of Portland-slag cement varies from-
10 to 40%
70 to 80%
40 to 70%
80 to 90%
330. The silica in Portland cement should be
10 to 20%
20 to 25%
25 to 40%
40 to 60%
331. The compressive strength of ordinary cement is less than its tensile strength
right
wrong
332. The normal consistency of Portland cement is about-
10%
15%
20%
25%
333. ইটের Herring-bone bond গাঁথুনি কোন কাজে ব্যবহৃত হয়?
Brick paving
Very thick wall
Partition walls
Footing foundation
334. 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%
335. Initial setting time (minimum) of ordinary port land cement is- [BPSC-22]
60 minutes
45 minutes
30 minutes
20 minutes
336. The moisture content in timber for framework should not exceed-
5%
10%
15%
20%
337. The fuel generally used for burning limestone is
coalur
firewood
charcoal
any one of these
338. The main constituent of Portland cement is-
lime
iron oxide
alumina
alkalies
339. Lime occurs in a free state in nature.
True
False
340. The commonly used lime in white washing is---
quick lime
fat lime
lean lime
hydraulic lime