MCQ
26281. Le-chatelier apparatus used to perform- [BPSC-20]
ব্যাখ্যা:
সিমেন্টের সাউন্ডনেস টেস্ট করা জন্য ব্যবহৃত যন্ত্রের নাম Le-chatelier apparatus.
Fineness test
Soundness test
Consistency test
Compressive strength test
26282. Calculate standard consistency (%) when 100ml if water is added in 1kg of cement-----[BB-20]
ব্যাখ্যা: Standard Consistency (%) = (wt of water added/wt of cement) x 100
=(100/1000)x100=10
10
1000
100
1
26283. Granite is an example of- [MES-18, MOD-20]
ব্যাখ্যা: The rocks in which clay content is predominant are called argillaccous rock. (আগ্নেয় শিলা) 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.
aqueous rocks
sedimentary rock
metamorphic rocks
igneous rocks
26284. Geologically marble is known as- [PPA-19]
ব্যাখ্যা: Marble is a metamorphle rock (রূপান্তরিত শিলা) composed of recrystallized carbonate minerals, most commonly calcite or dolomite.
Sedimentary rock
Igneous rock
Metamorphic rock
Stratified rock
26285. কৃদন্ত পদের পূর্ববর্তী পদকে কী বলে ?
উপপদ
প্রাতিপদিক
প্রপদ
পূর্বপদ
26286. The maximum percentage of chemical ingredient of cement is that of- [PPA-19]
ব্যাখ্যা: Lime percentage in cement 67%.
magnesium
iron oxide
aluminium
lime
26287. French polish is- [PPA-20]
ব্যাখ্যা: Oil paint is a type of slowdrying paint that consists of particles of pigment suspended in a drying oil, commonly linseed oil.
Oil paint
Distemper
Spirit varnish
Asphalt
26288. [MOD-20] What is the unit weight of water?
ব্যাখ্যা: The specific weight, also known as the unit weight, is the weight per unit volume of a material. A commonly used value is the specific weight of water on Earth at 4°C, which is 9.807 kN/m² or 62.5 Ibf/ft².
50 Ib/ft²
62.5 Ib/ft²
90.5 Ib/ft^3
100 lb/ft^3
26289. উচ্চারণের রীতি অনুযায়ী নিচের কোনটি উচ্চমধ্য-সম্মুখ স্বরধ্বনি?
অ
আ
ও
এ
26290. The coefficient of hardness of stones used in road works should not be greater than : [PPA-20]
ব্যাখ্যা:
The coefficient of hardness of stone between 14-17 for building purpose and greater than 17 is used for road.
10
12
15
17
26291. Oil point-এর ক্ষেত্রে সাধারণত Solvent হিসাবে ব্যবহার করা হয়- [BPSC-20]
ব্যাখ্যা: Oil paint-এর সাথে Turpentine মিশ্রণের মাধ্যমে Paint- কে ব্যবহার উপযোগী করা হয়, কারণ Oil paint-এর Solvent হিসাবে Water মিশ্রিত করা যায় না। Oil paint-কে পাতলা বা নরম করার জন্য Solvent হিসাবে Turpentine ব্যবহার করা হয়।
Linseed oil
Turpentine
Naptha
Kerosene
26292. Soundness of cement is tested by- [BB-20]
ব্যাখ্যা: Soundness of cement may be determined by two methods, namely le-chatelier method and autoclave method,
Soundness of cement is tested by le-chatelier apparatus.
Vicats appararus
Le-chatelier apparatus
Compressive strength testing apparatus
none of these
26293. The portion of bricks at across the width in half is called- [MOCA-19]
ব্যাখ্যা: ইটের প্রন্থের অর্ধেক অংশকে হাফ ব্যাট (Half bat) বলে।
half sprit
half closer
half bed
half bat
26294. Efflorescence is caused if-. [MOD-20]
ব্যাখ্যা: Three factors must be present wherever efflorescence appears:
A soluble salt: A variety of salts and salt-forming chemicals can be present in masonry.
Water: Moisture is the vehicle that carries the salt 10
the surface of the masonry.
Channels: Concrete and bricks have microscopic pores. These tiny channels allow water to move by
wicking action.
the alkaline salt is present in the bricks
the clay used for making bricks contain pyrite
the water used for pugging the clay contain gypsum
all of the above
26295. Which of the following cements is suitable for use in massive concrete structures such as large dams? [BB-20]
ব্যাখ্যা: Low heat cement is one of the hydraulic binding materials and would always be perferred for massive structures such as dams. It has excellent performance such as high final strength, long lasting properties.
Ordinary Portland cement
Low heat cement
Rapid hardening cement
Sulphate resisting cement
26296. Gneiss is chemically classified as- [MES-18]
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.
calcareous rock
argillaceous rock
silicious rock
none of these
26297. Quick lime on reacting with water gives- [MOD-20]
ব্যাখ্যা: When quick lime is added to water, it reacts to jomm calcium hydroxide (slaked lime). CaO(s) + H2O(l) → Ca(OH)2 (aq) + heat
Quick lime Slake lime
hydraulic lime
hydrated lime
poor lime
slaked lime
26298. Laterite is chemically classified as [MES-18]
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.
calcareous rock
argillaceous rock
silicious rock
metamorphic rock
26299. Which one is the fine aggregate? [MOD-20]
ব্যাখ্যা: Sand, surki, stone screenings, burnt clays, cinders, fly ash etc. are used as fine aggregate in concrete.
cement
sand
khoa
lime
26300. What are the two main elements of Portland cement? [BREB-17, HED-19]
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.
Lime & Silica
Lime & Iron
Lime & Alumina
Silica & Copper