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[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
2. Approximate value of shrinkage strain n concrete is
(A) 0.03
(B) 0.003
(C) 0.0003
(D) 0.00003[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
3. The percentage of voids in cement is approximately
(A) 25%
(B) 40%
(C) 60%
(D) 80%[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] B [/accordion-item][/accordion]
4. 1% of boyds voids in concrete mix reduce would reduce its strength by about
(A) 5%
(B) 10%
(C) 15%
(D) 20%[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] A [/accordion-item][/accordion]
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[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] D [/accordion-item][/accordion]
6. Minimum thickness of load bearing RCC wall should be
(A) 50 mm
(B) 100 mm
(C) 150 mm
(D) 200 mm[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] B [/accordion-item][/accordion]
7. Percentage reinforcement in case of slabs is limited to
(A) 2
(B) 4
(C) 6
(D) 8[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] B [/accordion-item][/accordion]
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