Three basic raw materials which are needed in large quantities for production of steel are_______________?
A. Iron ore, coal and sulphur
B. Iron ore, carbon and sulphur
C. Iron ore, coal and lime stone
D. Iron ore, carbon and lime stone
Which of the following cements is suitable for use in massive concrete structures such as large dams ?
A. Ordinary portland cement
B. Low heat cement
C. Rapid hardening cement
D. Sulphate resisting cement
Gypsum consists of______________?
A. H2s and c02
B. Cas04 and h20
C. Lime and h20
D. C02 and calcium
After storage, the strength of cement________________?
A. Decreases
B. Increases
C. Remains same
D. May increase or decrease
The slump recommended for mass concrete is about_______________?
A. 25 mm to 50 mm
B. 50 mm to 100 mm
C. 100 mm to 125 mm
D. 125 mm to 150 mm