Concrete Technology and Design Exam Quiz Questions - Set 20 - ObjectiveBooks

# Practice Test: Question Set - 20

1. Proper proportioning of concrete, ensures
(A) Desired strength and workability
(B) Desired durability
(C) Water tightness of the structure
(D) All the above

2. The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by
(A) fcr - fcs = fcl
(B) fcr > fcs > fcl
(C) fcr < fcs < fcl
(D) fcs > fcr > fcl

3. Wp and Wf are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor (Wp/Wf) is 0.95, the workability of concrete is
(A) Extremely low
(B) Very low
(C) Low
(D) High

4. Air entrainment in the concrete increases
(A) Workability
(B) Strength
(C) The effects of temperature variations
(D) The unit weight

5. Construction joints are provided
(A) Where B.M. and S.F. are small
(B) Where the member is supported by other member
(C) At 18 m apart in huge structures
(D) All the above

6. Maximum distance between expansion joints in structures as per IS: 456 1978 is
(A) 20 m
(B) 30 m
(C) 45 m
(D) 60 m

7. Ordinary concrete is not used for concrete grade
(A) M 100
(B) M 150
(C) M 250
(D) M 400

8. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always
(A) Zero
(B) Tensile
(C) Compressive
(D) Tensile or compressive

9. An aggregate is said to be flaky, if its least dimension is less than
(A) 2/3 mean dimension
(B) 3/4 mean dimension
(C) 3/5 mean dimension
(D) 5/8 mean dimension

10. The depth of footing for an isolated column is governed by
(i) Maximum bending moment
(ii) Shear force
(iii) Punching shear
(A) Only (i)
(B) (i) and (ii)
(C) (i) and (iii)
(D) All (i), (ii) and (iii)

11. Minimum thickness of load bearing RCC wall should be
(A) 50 mm
(B) 100 mm
(C) 150 mm
(D) 200 mm

12. M 150 grade of concrete approximates
(A) 1 : 3 : 6 mix
(B) 1 : 1 : 2 mix
(C) 1 : 2 : 4 mix
(D) 1 : 1.5 : 3 mix

13. The effect of adding calcium chloride in concrete is
(i) To increase shrinkage
(ii) To decrease shrinkage
(iii) To increase setting time
(iv) To decrease setting time
(A) (i) and (iii)
(B) (i) and (iv)
(C) (ii) and (iii)
(D) (ii) and (iv)

14. Permissible compressive strength of M 300 concrete grade is
(A) 100 kg/cm2
(B) 150 kg/cm2
(C) 200 kg/cm2
(D) 300 kg/cm2

15. Strength of concrete increases with
(A) Increase in water-cement ratio
(B) Increase in fineness of cement
(C) Decrease in curing time
(D) Decrease in size of aggregate

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