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MCQ
321. In a mortar, the binding material is-[PBRLP-21]
Cement
Sand
Course aggregate
Water
322. The moisture content in timber for framework should not exceed-
5%
10%
15%
20%
323. The percentage of the slag component of Portland-slag cement varies from-
10 to 40%
70 to 80%
40 to 70%
80 to 90%
324. The main purpose of timber seasoning is-[BPSC-22]
to make timber cocter
to made timber fire resistant
to remove moisture at uniform rate
None of the above
ব্যাখ্যা: Seasoning of timber is the process by which moisture content in the timber is reduced to required level. By reducing moisture content, the strength, elasticity and durability properties are developed.
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 compressive strength of ordinary cement is less than its tensile strength
right
wrong
327. A first class brick when immersed in cold water for 24 hours should not absorb water more than- [BPSC-22]
10%
20%
15%
25%
ব্যাখ্যা: A first class brick when immersed in cold 11 water for 24 hours, it absorb 1/5 to 1/7 (15% to 20%). It should not absorb water more than 20%.
328. 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
329. A good quality of stone absorbs water less than------[BPSC-22]
5%
10%
15%
20%
ব্যাখ্যা: A good building stone should be less porous. It should not absorb more than 5% of water. Any stone absorbing 10% of water should be rejected.
330. Inner part of a timber log surrounding the pith, is called- [PBRLP-21]
Sapwood
Cambium layer
Heartwood
None of the above
331. The initial setting time of rapid hardening cement should not be less than--
30 min
4 hours
1 hour
10 hours
332. What is the main compound of typical Portland Cement- [PBRLP-21]
CaO
SiO₂
Al₂O3
Fe,O3
333. ইটের Herring-bone bond গাঁথুনি কোন কাজে ব্যবহৃত হয়?
Brick paving
Very thick wall
Partition walls
Footing foundation
334. What happens when fineness of cement is increased- [PBRLP-21]
It decreases the rate of hydration
It has no-impact on rate of hydration
It increases the rate of hydration
None of the above
335. The diameter of the needle of Vicat apparatus for measuring in initial setting is- [PBRLP-21]
0.5mm
1.0mm
1.10mm
1.50mm
336. 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.
337. If two types of sand having FM 2.5 and 2.25 respectively and mix together as same ratio what will be the combined FM? [MOD-20]
2.65
2.37
4.75
4.5
338. The normal consistency of Portland cement is about-
10%
15%
20%
25%
339. The final setting time of ordinary cement should not be more than-
2 hours,
4 hours
4 hours
10 hours
340. যদি বালুর FM ৩.০ হয় তবে উক্ত বালুকে বলা হয়-
very fine sand
fine sand
medium sand
flaky