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MCQ
26261. What is the unit weight of cement? [MES-16]
1440 kg/Cum
1620 kg/Cum
1200 kg/Cum
1500 kg/Cum
ব্যাখ্যা: Considering dry loose bulk density of following concrete ingredients as- Cement1440 kg/cum Fine Aggregate= 1600 kg/cum Coarse Aggregate = 1450 kg/cum Water 1000 kg/cum
26262. Which of the following is an example of silicious rock? [MES-18]
granite
gneiss
quartzite
all of these
ব্যাখ্যা: The rocks which contain silica in predominant amount are called as siliceous rocks. Presence of a large amount of free sillca makes them harden and durable. Granite, greiss, quartzite, chert. etc. are example of siliceous rocks.
26263. In general FM of Sylhet sand is- [BGFCL-17]
1.8
2.5
1.5
2.8
ব্যাখ্যা: FM of sylhei sand value 2.3-2.90. But the standard value 2.50.
26264. The compressive strength of granite is-(MES-18]
50 to 70 MN/m²
70 to 130 MN/m²
130/to 170 MN/m²
170 to 200 MN/m²
ব্যাখ্যা: The compressive strength of granite is 750 to 1350 kg/cm² or 70 to 130 MN/m².
26265. How many types of manufacture of fire bricks? [BREB-17]
3
4
2
5
ব্যাখ্যা: Fire bricks are classified majorly into three types: 1. Acidic fire bricks 2. Basic fire bricks 3. Neutral fire bricks.
26266. Cement-এর Consistency test-এ কোনটি ব্যবহৃত হয়?[MOLE-19, BB-20]
Casagrande apparatus
Vicat's apparatus
UTM
Proctor apparatus
সিমেন্টের আদর্শ ঘনত্ব (Consistency) পরীক্ষা Vicat apparatus দ্বারা করা হয়। এই apparatus-এর vicat plunger যদি মোল্ডের নিচ থেকে 5mm হতে 7mm পর্যন্ত প্রবেশ করে, তাহলে একে আদর্শ ঘনত্ব বলে।
26267. The chief ingredient of paint is [BGFCL-17]
alcohol
drier
oil
pigment
ব্যাখ্যা: A powdered substance that is mixed with a liquid in which it is relatively insoluble and used especially to important color to coating materials (such as paints) paint is depend on pigment because pigment fixed different color. So the chief ingredient of paintsis pigments.
26268. The weight of cement in one bag is- [MES-18]
45 kg
50 kg
60 kg
65 kg
ব্যাখ্যা: Weight of 1 bag cement = 50 kg = 0.0347 m^3 = 1.25 fr^3.
26269. What is the percentage of silica for 1st class bricks? [MES-16]
55%
65%
75%
50%
ব্যাখ্যা: Normally, bricks contain the following ingredients- (i) Silica (sand)-50% to 60% by weight (ii) Alumina (clay) 20% to 30% by weight (iii) Lime-2% to 5% by weight.
26270. Generally....... is used in varnish. [BREB-17]
spirit
water
transformer oil
none of these
ব্যাখ্যা: Varnish is primarily used in wood finishing. The elements of varnish are resins, driers, solvent. Solvent means tung oil, phenolic, polyurethane or alkyd and solvents like naphtha, mineral spiritor thimer.
26271. The specific gravity of stone should not, in any case, be less than- [MES-18]
1
1.5
2
2.5
ব্যাখ্যা: The specific gravity of stone should be greater than 2.7 or so. But the specific gravity of stone should not less than 2.5
26272. Marble is an example of- [MES-18]
aqueous rocks
metamorphic rock
sedimentary rocks
igneous rocks
ব্যাখ্যা: Metamorphic rocks are formed by the metamorphism process. Some example of metamorphic rocks are slate, gneiss, schist, marble, soapstone etc.
26273. A good building stone is one which does not absorb more than....of its weight of water after one day's immersion- [BREB-15, MES-18]
5%
10%
15%
25%
ব্যাখ্যা: A good building stone shouldn't absorb more than 5% water but stone absorbing more than 10% should be rejected.
26274. What is the standard width of corrugated sheet? [MES-16]
85cm
80cm
70cm
75cm
ব্যাখ্যা: The standard width of corrugated sheet is 85cm. The two most common widths are 26 and 36 inches.
26275. Which of the following is an example of argillaceous rock? [MES-18]
kaolin
slate
laterite
all of these
ব্যাখ্যা: The rocks in which clay content is predominant are called argillaccous rock The rocks are soft in nature and with the presence of water they can be crumbled easily some of the argillaceous rocks are shale, slate, kaolin, literate etc.
26276. Generally used fine aggregate in our country-
clay
sand
stone
silt
ব্যাখ্যা: Fine aggregate generally consist of natural sand or crushed stone with most particles passing through a 3/8 inch sieve. But generally use fine aggregate in our country sand.
26277. The base material for distemper is [MES-18]
chalk
lime
clay
lime putty
ব্যাখ্যা: Distempers are the cheaper variety of paints in which chalk is used as base and water is used as a carrier. So the base material for distemper is chalk.
26278. The volume of cement in one bag is [MES-16]
1.00 cft
1.50 cft
1.25 cft
1.15 cft
ব্যাখ্যা: Density of cement in loose conditions = 1440 kg/m² Mass of one bag cement = 50 kg Volume =Mass/ Density = 50/1440 = 0.0347 cum = 0.0347x35.3147 = 1.225 cft
26279. When first class brick is sunk 24 hours in water how much water will absorbed of its weight? [MES-16]
1/3
1/6
1/4
1/7
ব্যাখ্যা: A first class brick shall not absorb more than 8th of its dry weight when immersed in water for 24 hours. The water absorption capacity for the first class bricks should be under 20%
26280. Generally the compressive strength for good bricks is- [MES-16]
100-110 kg/cm²
120-130kg/cm²
140-150 kg/cm²
150-160 kg/cm²
ব্যাখ্যা : Compressive strenght of bricks- (i) Compressive strength of first class bricks is 105 kg/cm² (ii) Compressive strength of 2nd class brick is 70 kg/cm (iii) Compressive strength of common building brick is 35 kg/cm²