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ইঞ্জিনিয়ারিং মেটেরিয়ালস MCQ
281. Soundness of cement is tested by- [BB-20]
Vicats appararus
Le-chatelier apparatus
Compressive strength testing apparatus
none of these
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.
282. French polish is- [PPA-20]
Oil paint
Distemper
Spirit varnish
Asphalt
ব্যাখ্যা: Oil paint is a type of slowdrying paint that consists of particles of pigment suspended in a drying oil, commonly linseed oil.
283. Quick lime on reacting with water gives- [MOD-20]
hydraulic lime
hydrated lime
poor lime
slaked lime
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
284. 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.
285. Le-chatelier apparatus used to perform- [BPSC-20]
Fineness test
Soundness test
Consistency test
Compressive strength test
ব্যাখ্যা: সিমেন্টের সাউন্ডনেস টেস্ট করা জন্য ব্যবহৃত যন্ত্রের নাম Le-chatelier apparatus.
286. Oil point-এর ক্ষেত্রে সাধারণত Solvent হিসাবে ব্যবহার করা হয়- [BPSC-20]
Linseed oil
Turpentine
Naptha
Kerosene
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।
287. Which of the following cements is suitable for use in massive concrete structures such as large dams? [BB-20]
Ordinary Portland cement
Low heat cement
Rapid hardening cement
Sulphate resisting cement
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.
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. [MOD-20] What is the unit weight of water?
50 Ib/ft²
62.5 Ib/ft²
90.5 Ib/ft^3
100 lb/ft^3
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.
290. 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.
291. 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।
292. 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.
293. 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.
294. 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.
295. 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.
296. 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.
297. The maximum percentage of chemical ingredient of cement is that of- [PPA-19]
magnesium
iron oxide
aluminium
lime
ব্যাখ্যা: Lime percentage in cement 67%.
298. 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.
299. The coefficient of hardness of stones used in road works should not be greater than : [PPA-20]
10
12
15
17
ব্যাখ্যা: The coefficient of hardness of stone between 14-17 for building purpose and greater than 17 is used for road.
300. Calculate standard consistency (%) when 100ml if water is added in 1kg of cement-----[BB-20]
10
1000
100
1
ব্যাখ্যা: Standard Consistency (%) = (wt of water added/wt of cement) x 100 =(100/1000)x100=10