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ইঞ্জিনিয়ারিং মেটেরিয়ালস MCQ
261. 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
262. 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%
263. 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.
264. 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.
265. 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.
266. 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.
267. The percentage of silica in a good brick clay should very from- [BREB-15; MES-16]
20 to 30%
30 to 40%
40 to 50%
50 to 60%
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.
268. Vicat's apparatus is used to determine the [MES-16]
initial setting time of cement
final setting time of cement
normal consistency of cement
all of these
ব্যাখ্যা: Vicat's apparatus is used to determine consitency and initial/final set times of cements and mortar pastes. This unit can be modified for testing to determine false set.
269. 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
270. 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.
271. সর্বনিম্ন কত মিমি চালুনি দিয়ে অতিক্রম না করলে নমুনাকে কোর্স এগ্রিগেটস হিসেবে ধরা হয়? /BWDB-20]
৪.৭৫ মিমি
২.৩৬ মিমি
২.৪৫ মিমি
৫ মিমি
ব্যাখ্যা: ৪.৭৫ মিমি চালুনি দিয়ে অতিক্রম করলে নমুনাকে ফাইন এমিগেট বলে এবং ৪.৭৫ মিমি চালুনি দিয়ে অতিক্রম না করলে নমুনাকে কোর্স এগ্রিগেট বলে।
272. 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
273. 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.
274. 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.
275. সিমেন্টের গুণাগুণ নির্ণয়ের কয়টি পরীক্ষা করা হয়?[RAJUK-17, BBA-20
২টি
৩টি
৪টি
৫টি
ব্যাখ্যা: পরীক্ষাসমূহঃ ১। সূক্ষ্মতা পরীক্ষা ২। জমাটবদ্ধতার সময় পরীক্ষা ৩। খুঁতহীনতা পরীক্ষা ৪। রাসায়নিক গঠন পরীক্ষা ৫। শক্তি পরীক্ষা।
276. 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.
277. The bricks should be burnt at temperature from- [MES-16]
300°C to 500°C
500°C to 700°C
700°C to 1000°C
1000°C to 1200°C
278. 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।
279. 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
280. 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.