Building Materials and Construction

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

A. cast iron
B. wrought iron
C. mild steel
D. high carbon steel

A. to increase the initial setting time of cement paste in concrete
B. to decrease the initial setting time of cement paste in concrete
C. to render the concrete more water tight
D. to improve the workability of concrete mix

A. gypsum
B. calcium chloride
C. calcium carbonate
D. none of the above

A. 160N/mm2
B. 260N/mm2
C. 420 N/mm2
D. 520 N/mm2

A. ordinary Portland cement
B. low heat cement
C. rapid hardening cement
D. sulphate resisting cement

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

A. iron
B. carbon
C. manganese
D. sulphur

A. gypsum
B. calcium chloride
C. calcium carbonate
D. none of the above

A. 1
B. 2
C. 3
D. 4