**1. Workability concrete is directly proportional to **

**(A) **aggregate cement ratio

**(B) **time of transit

**(C)** grading of the aggregate

**(D)** all of the above

#### **Answe****r ⇓**

**2. Approximate value of shrinkage strain n concrete is**

**(A) **0.03

**(B)** 0.003

**(C)** 0.0003

**(D)** 0.00003

#### **Answe****r ⇓**

**3. The percentage of voids in cement is approximate**ly

**(A) **25%

**(B)** 40%

**(C)** 60%

**(D)** 80%

#### **Answer ⇓**

**4. 1% of boyds voids in concrete mix reduce would reduce its strength by about **

**(A) **5%

**(B)** 10%

**(C)** 15%

**(D)** 20%

#### **Answer ⇓**

**5. The ratio of the diameter of reinforcing bars and the slab thickness is**

**(A) **1/4

**(B)** 1/5

**(C)** 1/6

**(D)** 1/8

#### **Answe****r ⇓**

**6. Minimum thickness of load bearing RCC wall should be**

**(A) **50 mm

**(B)** 100 mm

**(C)** 150 mm

**(D)** 200 mm

#### **Answer ⇓**

**7. Percentage reinforcement in case of slabs is limited to **

**(A) **2

**(B)** 4

**(C)** 6

**(D)** 8

#### **Answer ⇓**

**8. Ratio of compressive strength to tensile strength of concrete **

**(A) **increases with age

**(B)** decreases with age

**(C)** remains constant

**(D)** none of the above