MCQ
341. The average out-turn of first class bricks in clamp burning is about-
50%
60%
70%
80%
342. The main constituent of Portland cement is-
lime
iron oxide
alumina
alkalies
343. The frog of a brick is normally made on its-
longer face
bottom face
shorter face
top face
344. For the construction of retaining walls, a------stone must be used.
soft
hard
heavy
light
345. Lime occurs in a free state in nature.
True
False
346. The silica in Portland cement should be
10 to 20%
20 to 25%
25 to 40%
40 to 60%
347. The burning of bricks in kilns is completed within-----hours.
12
24
48
96
348. The commonly used lime in white washing is---
quick lime
fat lime
lean lime
hydraulic lime
349. The average out-turn of first class bricks in kiln burning is-
50 to 60%
60 to 70%
70 to 80%
80 to 90%
350. ASTM No. 16 সিভের ওপেনিং সাইজ কত মিমি? [BWDB-20]
১.১৮ মিমি
১.৪০ মিমি
২.৩৬ মিমি
১.৭০ মিমি
কোনোটিই নয়
351. The percentage of alumina in a good brick clay should vary from-
20 to 30%
30 to 40%
40 to 50%
50 to 60%
352. The cementing property in cement is mainly due to---
lime
silica
iron oxide
alumina
353. দুটি বালির নমুনার ওজন ও FM যথাক্রমে 500 গ্রাম ও 750 গ্রাম এবং 2.5 ও 2.2 হলে তাদের Combined FM কত হবে? [BPSC-20]
2.4
2.38
2.42
2.32
354. The fuel generally used for burning limestone is
coalur
firewood
charcoal
any one of these
355. The compressive strength of perforated bricks should not be less than-
4 MN/m²
5 MN/m²
6 MN/m²
7 MN/m²
356. For one cubic metre of brick masonry, the number of bricks required is-
400
450
500
550
357. The size of mould for bricks should be---- the specified size of the bricks.
equal to
double
smaller than
larger than
358. The natural drying of bricks is also called back drying.
true
false
359. The amount of gypsum usually added in the manufacture of cement is-
0.5 to 1%
3 to 5%
1 to 3%
0.1 to 0.5%
360. The compressive strength of paving bricks should not be less than-
20 MN/m²
30 MN/m²
40 MN/m²
50 MN/m²