6. Which of the following is the compressive strength of concrete if β1=0.85. a. 21 MPa b. 33 MPa c. 35 MPa d. 56 MPa   7. Which of the following is the compressive strength of concrete if β1=0.65. a. 35 MPa b. 21 MPa c. 60 MPa d. 42 MPa   8. Which of the following is the compressive strength of concrete if β1=0.80. a. 60 MPa b. 21 MPa c. 35 MPa d. 42 MPa

6. Which of the following is the compressive strength of concrete if β1=0.85.

a. 21 MPa

b. 33 MPa

c. 35 MPa

d. 56 MPa

7. Which of the following is the compressive strength of concrete if β1=0.65.

a. 35 MPa

b. 21 MPa

c. 60 MPa

d. 42 MPa

8. Which of the following is the compressive strength of concrete if β1=0.80.

a. 60 MPa

b. 21 MPa

c. 35 MPa

d. 42 MPa

9. For parallel non-prestressed reinforcement in a horizontal layer, clear spacing shall be

at least the greatest of the following except

a. 25 mm

b. 30 mm

c. diameter of the steel bar

d. 4/3 of the aggregates nominal size

10. For parallel non-prestressed reinforcement placed in two or more horizontal layer,

reinforcement in the upper layers shall be placed directly above reinforcement in the

bottom layer with the clear spacing between layers of at least

a. 30 mm

b. diameter of steel bar

c. 25 mm

d. 4/3 of the aggregates nominal size

11. Adding bars will impart significant increase in the moment strength of flexural

members within

a. Compression controlled region

b. Transition region

c. Tension controlled region

d. None of the choice.

12. Increasing the moment capacity of a flexural member is best achieved by increasing

the

a. Yield strength of steel

b. Compressive strength of concrete

c. Effective depth

d. Width of the member

13. Increasing the ductility of a flexural member is best achieved by increasing the

a. Compressive strength of concrete

b. Effective depth

c. Yield strength of steel

d. Overall depth

14. The curvature of the beam is increased if the area of tension reinforcement is

a. increased

b. remain constant

c. decreased

d. none of the choices