Concrete Technology and Design of Concrete Structures MCQ - Set 05 - ObjectiveBooks

Concrete Technology and Design of Concrete Structures MCQ - Set 05

Practice Test: Question Set - 05


1. For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are:
    (A) 70 liters of sand and 120 liters of aggregates
    (B) 70 kg of sand and 140 liters of aggregates
    (C) 105 liters of sand and 140 liters of aggregates
    (D) 105 liters of sand and 210 liters of aggregates

2. A concrete using an air entrained cement
    (A) Has strength less than 10% to 15%
    (B) Has more resistance to weathering
    (C) Is more plastic and workable
    (D) Is free from segregation and bleeding

3. In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on
    (i) Bottom face near counterfort
    (ii) Top face near counterfort
    (iii) Bottom face near centre of span
    (iv) Top face near centre of span
    The correct answer is
    (A) Only (i)
    (B) Only (ii)
    (C) Both (i) and (iv)
    (D) Both (ii) and (iii)

4. Pick up the correct statement from the following:
    (A) Segregation is necessary for a workable concrete
    (B) Consistency does not affect the workability of concrete
    (C) If the concrete mix is dry, the slump is maximum
    (D) None of these

5. The surface where two successive placements of concrete meet, is known as
    (A) Contraction joint
    (B) Expansion joint
    (C) Construction joint
    (D) Both (a) and (b)

6. A beam curved in plan is designed for
    (A) Bending moment and shear
    (B) Bending moment and torsion
    (C) Shear and torsion
    (D) Bending moment, shear and torsion

7. Pick up the correct statement from the following:
    (A) Water cement paste hardens due to hydration
    (B) During hardening cement binds the aggregates together
    (C) Cement provides strength, durability and water tightness to the concrete
    (D) All the above

8. 'Ware house pack' of cement means
    (A) Full capacity of the ware house
    (B) Pressure exertion of the bags of upper layers
    (C) Pressure compaction of the bags on lower layers
    (D) Packing the ware house

9. High carbon content in the steel causes
    (A) Decrease in tensile strength but increase in ductility
    (B) Increase in tensile strength but decrease in ductility
    (C) Decrease in both tensile strength and ductility
    (D) Increase in both tensile strength and ductility

10. If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed
    (A) 10 cm
    (B) 15 cm
    (C) 20 cm
    (D) 25 cm

11. Particles of 0.002 mm size are that of
    (A) Clay
    (B) Sand
    (C) Gravel
    (D) None of these

12. Ultimate strength of cold drawn high steel wires
    (A) Increases with increase in diameter of bar
    (B) Decreases with increase in diameter of bar
    (C) Does not depend on diameter of bar
    (D) None of the above

13. The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as
    (A) Low-heat Portland cement
    (B) Rapid hardening Portland cement
    (C) Portland blast slag cement
    (D) Portland pozzolana cement

14. The dimensions of a 35 liter forma for measuring aggregates by volume, are:
    (A) Length 30 cm, breadth 25 cm, height 30 cm
    (B) Length 39 cm, breadth 25 cm, height 32 cm
    (C) Length 27 cm, breadth 27 cm, height 48 cm
    (D) Length 220 cm, breadth 25 cm, height 40 cm

15. Ratio of permissible stress in direct compression and bending compression is
    (A) Less than 1
    (B) Between 1 and 1.5
    (C) Between 1.5 and 2.0
    (D) Greater than 2

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