- A. Roasting is not necessary if iron ore is an oxide
- B. Impurities float on the molten iron as slag
- C. The slag contains lime about 45%
- D. All the above
Building Materials
-
Pick up the correct statement from the following:
-
Seasoning is
- A. A process of removing sap
- B. Creosoting
- C. Painting with sodium silicate
- D. Coating with tar
-
Specific gravity for most of the building stones lies between
- A. 1.5 to 2.0
- B. 2.0 to 2.5
- C. 2.5 to 3.0
- D. 3.0 to 3.5
-
The hardest rock is
- A. Marble
- B. Diamond
- C. Talc
- D. Quartz
-
Which one of the following polymers is obtained from condensation polymerization?
- A. Phenol formaldehyde
- B. Carbamide
- C. Melamine-formaldehyde
- D. All of these
-
Jhumb bricks are
- A. Under burnt
- B. Over burnt
- C. Kutcha
- D. None of these
-
Percentage of silica in a good brick earth lies between
- A. 5 to 10 %
- B. 20 to 30 %
- C. 50 to 60 %
- D. 70 to 80 %
-
The most important tool in brick laying for lifting and spreading mortar and for forming joints is
- A. Trowel
- B. Square
- C. Bolster
- D. Scutch
-
For high grade instruments the steel preferred to, is
- A. Cast steel
- B. Bessemer steel
- C. Mild steel
- D. Whitworth compressed steel
-
For melting one tonne of cast iron
- A. 700 m3 air is required
- B. 20 kg limestone is required
- C. One quintal coke is required
- D. All the above