Grading of Concrete

Q. The minimum grade of concrete is to be used in reinforced concrete as per (IS 456 : 2000)

1. M 15
2. M 20
3. M 10
4. M 25

Q. The grade of concrete M 15 means that compressive strength of a 15 cm cube after 28 days is :

1. $100kg/c{m}^2$
2. $150kg/c{m}^2$
3. $200kg/c{m}^2$
4. $250kg/c{m}^2$

Q. The ratio of various ingredients (cement, sand, aggregate) in concrete of grade M 15 is _______

1. 1 : 2 : 4
2. 1 : 3 : 6
3. 1 : 1.5 : 3
4. 1 : 1 : 2

Q. Ordinary concrete is not used for concrete grades :

1. M 10
2. M 15
3. M 25
4. M 40

Q. The general ratio of cement : sand: aggregate in nominal mix $M20$ grade concrete is:

1. $1:2:4$
2. $1:1.5:3$
3. $1:3:6$
4. $1:1:2$