Addition of pozzolana to ordinary Portland cement increases__________________?

A. bottom face
B. top face
C. shorter side
D. longer side

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

A. hard
B. soft
C. porous
D. impervious

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. 4% to 6%
B. 10% to 12%
C. 15% to 20%
D. 100%

A. pitched and slog roof
B. flat roof
C. shell roof
D. none of the above