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MCQ
281. Laterite is chemically classified as [MES-18]
calcareous rock
argillaceous rock
silicious rock
metamorphic rock
ব্যাখ্যা: Laterite is chemically classified as Argillaceous rock (আগ্নেয় শিলা) Laterite is a red coloured clayey material wich forms a topsoil in tropical regions. It is hard when it is dry.
282. 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.
283. 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.
284. 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.
285. 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.
286. Geologically marble is known as- [PPA-19]
Sedimentary rock
Igneous rock
Metamorphic rock
Stratified rock
ব্যাখ্যা: Marble is a metamorphle rock (রূপান্তরিত শিলা) composed of recrystallized carbonate minerals, most commonly calcite or dolomite.
287. 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.
288. What are the two main elements of Portland cement? [BREB-17, HED-19]
Lime & Silica
Lime & Iron
Lime & Alumina
Silica & Copper
ব্যাখ্যা: The elements of portland cement are lime or calcium oxide, silica, alumina, iron oxide, Magnesium oxide. But the main elements of portland cement are lime and silica.
289. The portion of bricks at across the width in half is called- [MOCA-19]
half sprit
half closer
half bed
half bat
ব্যাখ্যা: ইটের প্রন্থের অর্ধেক অংশকে হাফ ব্যাট (Half bat) বলে।
290. 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.
291. 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.
292. 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
293. Gneiss is chemically classified as- [MES-18]
calcareous rock
argillaceous rock
silicious rock
none of these
ব্যাখ্যা: Gneiss is a common and widely distributed type of metamorphic rock or silicious rock. Gneiss is a foliated siliceous rock in which the coarse mineral grains have been arranged into a banded structure.
294. 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
295. 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.
296. The maximum percentage of chemical ingredient of cement is that of- [PPA-19]
magnesium
iron oxide
aluminium
lime
ব্যাখ্যা: Lime percentage in cement 67%.
297. 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.
298. 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.
299. 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.
300. 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.