For testing compressive strength of cement, the size of cube used is_______________?

A. sand stone
B. lime stone
C. shale
D. gypsum

A. (1) and (4)
B. (2) and (3)
C. (1) and (2)
D. (3) and (4)

A. H2S and C02
B. CaS04 and H20
C. Lime and H20
D. C02 and calcium

A. less than 1
B. equal to 1
C. greater than 1
D. less than 1 in beams but greater than 1 in channels

A. 5 to 10%
B. 20 to 30%
C. 50 to 60%
D. 70 to 80%