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Basic Civil Engineering GK Questions about Bricks and Blocks
1. The desirable silt content in an alluvial soil suitable for the production of structural bricks is _
Answer: 20-30%
2. The percentage of voids in solid bricks is about:
Answer: 5%
3. The temperature at which bricks are burnt ranges from:
Answer: 7000 °C to 10000 °C
4. The maximum percent of water absorption for 2nd class bricks in 24 hours is limited to _
Answer: 25%
5. Water absorption in 1st class bricks should not be more than _
Answer: 15%
6. In brick earth, silica should be _
Answer: 50-60%
7. The molded bricks are dried before burning to an approximate moisture content of _
Answer: 3%
8. The dimensions of standard brick are:
Answer: 19 x 9 x 9cm and 19 x 9 x 4 cm
9. Size of frog in bricks is:
Answer: 10 x 4 x 2 cm and 10 x 4 x 1 cm
10. Efflorescence of bricks is due to:
Answer: Soluble salts present in clay for making bricks
11. Vitrification of bricks takes place at about:
Answer: 1100 °C
12. Hollow bricks are:
Answer: About 1/3 in weight of standard brick
13. The minimum average crushing strength of hollow clay blocks should be:
Answer: 3.5 N/m2.
14. The compressive strength of burnt clay bricks as per IS 1077 – 1976 is:
Answer: 35-350 Kg/cm 2
15. Tempering of bricks is done in:
Answer: Pug mills
16. Crushed pottery is used in the manufacture of:
Answer: Terracotta
17. What is Efflorescence?
Answer: Formation of white patches on the bricks surface
18. The raw bricks shrink during drying and warp during burning because of:
Answer: Excess of alumina and silica in brick earth
