RV f2w
- Bricks are burnt at a temperature range of
(a) 500°^ to 700°^ C (b) 700°^ to 900°^ C
(c) 900°^ to 1200°^ C (d) 1200°^ to 1500°^ C - Match List-I with List-II and select the correct answer using the codes given below the
lists :
List-I List-II
(Ingredients) (%)
(A) Silica (1) 50 – 60%
(B) Lime (2) 20 – 30%
(C) Alumina (3) 10%
(D) Alkalis (4) <10%
Codes :
(a)AB C D (b)AB C D
1234 1324
(c)AB C D (b)AB C D
1243 2143 - Match List-I with List-II and select the correct answer using the codes given below the
lists :
List-I List-II
(Ingredients) (Property)
A. Silica 1. imparts durability, prevents
shrinkage
B. Alumina 2. softens clay
C. Lime 3. renders clay plastic
D. Ferric Oxide 4. lowers fusing point
Codes :
(a)AB C D (b)AB C D
1324 1423
(c)AB C D (b)AB C D
1342 4312 - Excess of silica makes brick
(a) brittle on burning (b) to melt on burning
(c) to crack on drying (d) to warp - Which of the following is harmful in the clay used for making bricks?
(a) Iron oxide (b) Iron pyrite
(c) Alkali (d) Magnesia - When carbonaceous materials in the form of bituminous matter of carbon are present in
the clay, the bricks will
(a) be spongy (b) have black core
(c) be porus (d) have cracks - Swollen structure and white blotches will be found in bricks when
(a) carbon (b) bituminous matter
(c) organic matter (d) sulphur
is present in clay used for making bricks.