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