# 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 f**

_{cr}, splitting strength f_{cs}and direct tensile strength f_{cl}is given by- (A)

*f*

_{cr}-

*f*

_{cs}=

*f*

_{cl}

- (B)

*f*

_{cr}>

*f*

_{cs}>

*f*

_{cl}

- (C)

*f*

_{cr}<

*f*

_{cs}<

*f*

_{cl}

- (D)

*f*

_{cs}>

*f*

_{cr}>

*f*

_{cl}

**3.**

*W*and_{p}*W*are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor (_{f}*W*/_{p}*W*) is 0.95, the workability of concrete is_{f}- (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**

**The correct answer is**

- (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**

**The correct answer is**

- (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/cm

^{2}

- (B) 150 kg/cm

^{2}

- (C) 200 kg/cm

^{2}

- (D) 300 kg/cm

^{2}

**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

**View All Answers**

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