MCQ
22281. The frog of a brick is normally made on its-
longer face
bottom face
shorter face
top face
22282. The fuel generally used for burning limestone is
coalur
firewood
charcoal
any one of these
22283. The cementing property in cement is mainly due to---
lime
silica
iron oxide
alumina
22284. The average out-turn of first class bricks in kiln burning is-
50 to 60%
60 to 70%
70 to 80%
80 to 90%
22285. The average out-turn of first class bricks in clamp burning is about-
50%
60%
70%
80%
22286. The burning of bricks in kilns is completed within-----hours.
12
24
48
96
22287. The main constituent of Portland cement is-
lime
iron oxide
alumina
alkalies
22288. The percentage of the slag component of Portland-slag cement varies from-
10 to 40%
70 to 80%
40 to 70%
80 to 90%
22289. The compressive strength of paving bricks should not be less than-
20 MN/m²
30 MN/m²
40 MN/m²
50 MN/m²
22290. The normal consistency of Portland cement is about-
10%
15%
20%
25%
22291. The final setting time of ordinary cement should not be more than-
2 hours,
4 hours
4 hours
10 hours
22292. The natural drying of bricks is also called back drying.
true
false
22293. For the construction of retaining walls, a------stone must be used.
soft
hard
heavy
light
22294. For one cubic metre of brick masonry, the number of bricks required is-
400
450
500
550
22295. The size of mould for bricks should be---- the specified size of the bricks.
equal to
double
smaller than
larger than
22296. 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%
22297. The silica in Portland cement should be
10 to 20%
20 to 25%
25 to 40%
40 to 60%
22298. The compressive strength of perforated bricks should not be less than-
4 MN/m²
5 MN/m²
6 MN/m²
7 MN/m²
22299. The commonly used lime in white washing is---
quick lime
fat lime
lean lime
hydraulic lime
22300. The percentage of alumina in a good brick clay should vary from-
20 to 30%
30 to 40%
40 to 50%
50 to 60%