# Design of RC Structures Questions and Answers – Property of Bonds

This set of Design of RC Structures Multiple Choice Questions & Answers (MCQs) focuses on “Property of Bonds”.

1. Which of the following is inversely proportional to workability of concrete?
a) Water cement ratio
b) Air
c) Aggregate size
d) Transit time

Explanation: As the time of transit increases, the workability of the concrete decreases because of absorption and evaporation of water.

2. Which of the following is directly proportional to workability of concrete?
a) Water cement ratio
b) Transit Time
c) Aggregate cement ratio
d) Cement

Explanation: As the water cement ratio increases, the workability of concrete increases.

3. Size of the aggregate is inversely proportional to workability of concrete.
a) True
b) False

Explanation: Size of the aggregate is directly proportional to workability of concrete.

4. What do we call the admixtures which cause the early setting and hardening?
a) Accelerators
b) Retarders
c) Workability mixture

Explanation: These admixtures are very sensitive and exposed. They cause very early setting and hardening of concrete.

5. What is the percentage of voids in cement?
a) 5%
b) 10%
c) 20%
d) 40%

Explanation: The void percentage in cement is 40. Rest of the cement contains solid powder.

6. Finer grinding of cement affects only the ultimate strength.
a) True
b) False

Explanation: Finer grinding of cement affects only the early development of strength.

7. What is the amount of extra cement added in the case of hand mixing of cement?
a) 5%
b) 10%
c) 20%
d) 25%

Explanation: The extra cement added in the case of hand mixing is 10% as recommended by IS 456: 2000

8. What is the ratio of diameter of bars of reinforcement and slab thickness?
a) ½
b) ¼
c) 1/8
d) 1/16

Explanation: According to Code IS 3872, the ratio of diameter of bars of reinforcement and slab thickness is 1/8.

9. What is the maximum reinforcement provided in the column?
a) 2%
b) 4%
c) 6%
d) 8%

Explanation: According to IS 456- 1978, the maximum reinforcement provided in the column is 6%.

10. What is the maximum reinforcement for slabs?
a) 4%
b) 10%
c) 20%
d) 25%

Explanation: According to IS 456- 1978, the maximum reinforcement provided in the slab is 4%.

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