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

A. 10%
B. 20%
C. 30%
D. 40%

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. 1.5 to 2.0
B. 2.0 to 2.5
C. 2.5 to 3.0
D. 3.0 to 3.5

A. 0.2 liter
B. 0.4 liter
C. 0.6 liter
D. 0.8 liter

A. less than one year
B. 1 to 5 years
C. 5 to 10 years
D. more than 10 years