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MCQ
321. A first class brick when immersed in cold water for 24 hours should not absorb water more than- [BPSC-22]
10%
20%
15%
25%
323. যদি বালুর FM ৩.০ হয় তবে উক্ত বালুকে বলা হয়-
very fine sand
fine sand
medium sand
flaky
324. 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
326. The diameter of the needle of Vicat apparatus for measuring in initial setting is- [PBRLP-21]
0.5mm
1.0mm
1.10mm
1.50mm
327. Inner part of a timber log surrounding the pith, is called- [PBRLP-21]
Sapwood
Cambium layer
Heartwood
None of the above
329. 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
330. Initial setting time (minimum) of ordinary port land cement is- [BPSC-22]
60 minutes
45 minutes
30 minutes
20 minutes
331. The final setting time of ordinary cement should not be more than-
2 hours,
4 hours
4 hours
10 hours
333. ইটের Herring-bone bond গাঁথুনি কোন কাজে ব্যবহৃত হয়?
Brick paving
Very thick wall
Partition walls
Footing foundation
335. 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
336. 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
338. The percentage of the slag component of Portland-slag cement varies from-
10 to 40%
70 to 80%
40 to 70%
80 to 90%
339. The initial setting time of rapid hardening cement should not be less than--
30 min
4 hours
1 hour
10 hours
340. In brick field, pugmill is used for- [BPSC-22]
preparation of clay
drying of bricks
burning of bricks
moulding of bricks