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MCQ
22261. 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
22262. 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
22263. In a mortar, the binding material is-[PBRLP-21]
Cement
Sand
Course aggregate
Water
22264. Inner part of a timber log surrounding the pith, is called- [PBRLP-21]
Sapwood
Cambium layer
Heartwood
None of the above
22265. What is the main compound of typical Portland Cement- [PBRLP-21]
CaO
SiO₂
Al₂O3
Fe,O3
22266. 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.
22267. যদি বালুর FM ৩.০ হয় তবে উক্ত বালুকে বলা হয়-
very fine sand
fine sand
medium sand
flaky
22268. Which of the following is the purest form of iron? [BB-20]
Cast iron
Wrought iron
Mild steel
High carbon steel
ব্যাখ্যা: Wrought iron is the purest from of iron. It contains 0.12 to 0.25% carbon and is thus the purest from of iron.
22269. 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.
22270. The chief ingredient of a paint is---- [MOD-20]
thinner
alcohol
drier
pigment
ব্যাখ্যা: A pigment is a colored material that is completely or nearly insoluble in water. Generally dyes are often organic compounds whereas pigments are often inorganic compounds. Pigments of prehistoric and historic value include ochre, charcoal, and lapis lazuli.
22271. If water cement ratio decrease, compressive strength of concrete will-. [MOD-20]
increase
decrease
no change
increase
ব্যাখ্যা: The water-cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix. A lower ratio leads to higher strength and durability, but may make the mix difficult to work with and form. Workability can be resolved with the use of plasticizers.
22272. Good quality of cement should have higher percentage of-. [MOD-20]
silica
free lime
di-calcium silicate
tri-calcium silicate
ব্যাখ্যাঃ tri-calcium silicate-50% di-calcium silicate-30% tri-calcium aluminates-10% 1520 Teira calcium-10% gypsum-5%
22273. 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%.
22274. 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.
22275. The moisture content in timber for framework should not exceed-
5%
10%
15%
20%
22276. The compressive strength of ordinary cement is less than its tensile strength
right
wrong
22277. The diameter of the needle of Vicat apparatus for measuring in initial setting is- [PBRLP-21]
0.5mm
1.0mm
1.10mm
1.50mm
22278. ইটের Herring-bone bond গাঁথুনি কোন কাজে ব্যবহৃত হয়?
Brick paving
Very thick wall
Partition walls
Footing foundation
22279. 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.
22280. Seasoning of timber-. [MOD-20]
increase the weight of timber
improves strength properties of timber
does not give dimensional stability
all of these
ব্যাখ্যা: The process by which removal of excess moisture content from the timber at a suitable level in conjunction with improving strength is known as seasoning of timber.