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