ইঞ্জিনিয়ারিং মেটেরিয়ালস MCQ
261. What is the percentage of silica for 1st class bricks? [MES-16]
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.
55%
65%
75%
50%
262. Cement-এর Consistency test-এ কোনটি ব্যবহৃত হয়?[MOLE-19, BB-20]
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।
Casagrande apparatus
Vicat's apparatus
UTM
Proctor apparatus
263. The base material for distemper is [MES-18]
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.
chalk
lime
clay
lime putty
264. Generally used fine aggregate in our country-
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.
clay
sand
stone
silt
265. In general FM of Sylhet sand is- [BGFCL-17]
ব্যাখ্যা: FM of sylhei sand value 2.3-2.90. But the standard value 2.50.
1.8
2.5
1.5
2.8
266. 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
267. Generally....... is used in varnish. [BREB-17]
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.
spirit
water
transformer oil
none of these
268. সর্বনিম্ন কত মিমি চালুনি দিয়ে অতিক্রম না করলে নমুনাকে কোর্স এগ্রিগেটস হিসেবে ধরা হয়? /BWDB-20]
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।
৪.৭৫ মিমি
২.৩৬ মিমি
২.৪৫ মিমি
৫ মিমি
269. How many types of manufacture of fire bricks? [BREB-17]
ব্যাখ্যা: Fire bricks are classified majorly into three types:
1. Acidic fire bricks
2. Basic fire bricks
3. Neutral fire bricks.
3
4
2
5
270. When first class brick is sunk 24 hours in water how much water will absorbed of its weight? [MES-16]
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%
1/3
1/6
1/4
1/7
271. The chief ingredient of paint is [BGFCL-17]
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.
alcohol
drier
oil
pigment
272. Generally the compressive strength for good bricks is- [MES-16]
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
100-110 kg/cm²
120-130kg/cm²
140-150 kg/cm²
150-160 kg/cm²
273. Vicat's apparatus is used to determine the [MES-16]
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.
initial setting time of cement
final setting time of cement
normal consistency of cement
all of these
274. The specific gravity of stone should not, in any case, be less than- [MES-18]
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
1
1.5
2
2.5
275. The percentage of silica in a good brick clay should very from- [BREB-15; MES-16]
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.
20 to 30%
30 to 40%
40 to 50%
50 to 60%
276. What is the unit weight of cement? [MES-16]
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
1440 kg/Cum
1620 kg/Cum
1200 kg/Cum
1500 kg/Cum
277. What is the standard width of corrugated sheet? [MES-16]
ব্যাখ্যা: The standard width of corrugated sheet is 85cm. The two most common widths are 26 and 36 inches.
85cm
80cm
70cm
75cm
278. সিমেন্টের গুণাগুণ নির্ণয়ের কয়টি পরীক্ষা করা হয়?[RAJUK-17, BBA-20
ব্যাখ্যা: পরীক্ষাসমূহঃ
১। সূক্ষ্মতা পরীক্ষা
২। জমাটবদ্ধতার সময় পরীক্ষা
৩। খুঁতহীনতা পরীক্ষা
৪। রাসায়নিক গঠন পরীক্ষা
৫। শক্তি পরীক্ষা।
২টি
৩টি
৪টি
৫টি
279. The volume of cement in one bag is [MES-16]
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
1.00 cft
1.50 cft
1.25 cft
1.15 cft
280. The weight of cement in one bag is- [MES-18]
ব্যাখ্যা: Weight of 1 bag cement = 50 kg = 0.0347 m^3 = 1.25 fr^3.
45 kg
50 kg
60 kg
65 kg