According to IS specifications, the compressive strength of ordinary portland cement after three days should not be less than________________?

A. perpendicular distance between intra-dos and extrados
B. vertical distance between springing line and intrados
C. perpendicular distance between springing line and extrados
D. none of the above

A. double flemish bond facing and Eng-lish bond backing in each course
B. English bond facing and double flemish bond backing in each course
C. stretcher bond facing and double flemish bond backing in each course
D. double flemish bond facing and header bond backing in each course

A. hardness test
B. work ability test
C. weight test
D. toughness test

A. the underside of a stair
B. outer projecting edge of a tread
C. a slog member which supports the steps in a stair
D. a vertical member between two treads

A. 300 to 350 mm
B. 400 to 450 mm
C. 500 to 550 mm
D. 600 to 650 mm

A. bleeding
B. shrinkage
C. permeability
D. heat of hydration