Concrete Technology Important MCQs - Set 14 - ObjectiveBooks

Concrete Technology Important MCQs - Set 14

Practice Test: Question Set - 14


1. Sinking of an intermediate support of a continuous beam
    (i) Reduces the negative moment at support
    (ii) Increases the negative moment at support
    (iii) Reduces the positive moment at center of span
    (iv) Increases the positive moment at center of span
    The correct answer is
    (A) (i) and (iii)
    (B) (i) and (iv)
    (C) (ii) and (iii)
    (D) (ii) and (iv)

2. High temperature
    (A) Increases the strength of concrete
    (B) Decreases the strength of concrete
    (C) Has no effect on the strength of concrete
    (D) None of these

3. Horizontal construction joints in concrete walls are generally provided at
    (A) Soffit level
    (B) Window sill level
    (C) Floor level
    (D) All the above

4. Stress strain curve of high tensile steel
    (A) Has a definite yield point
    (B) Does not show definite yield point but yield point is defined by 0.1% proof stress
    (C) Does not show definite yield point but yield point is defined by 0.2% proof stress
    (D) Does not show definite yield point but yield point is defined by 2% proof stress

5. Addition of pozzolana to cement causes
    (A) Reduction in permeability
    (B) Loss of heat of hydration
    (C) Reduction in bleeding
    (D) All the above

6. Permissible compressive strength of M 200 concrete grade is
    (A) 100 kg/cm2
    (B) 150 kg/cm2
    (C) 200 kg/cm2
    (D) 250 kg/cm2

7. The minimum diameter of longitudinal bars in a column is
    (A) 6 mm
    (B) 8 mm
    (C) 12 mm
    (D) 16 mm

8. The high strength of rapid hardening cement at early stage, is due to its
    (A) Finer grinding
    (B) Burning at high temperature
    (C) Increased lime cement
    (D) Higher content of tricalcium

9. Sand requiring a high water cement ratio, belongs to
    (A) Zone I
    (B) Zone II
    (C) Zone III
    (D) Zone IV

10. Minimum grade of concrete to be used in reinforced concrete as per IS: 4561978 is
    (A) M 15
    (B) M 20
    (C) M 10
    (D) M 25

11. While compacting the concrete by a mechanical vibrator, the slump should not exceed
    (A) 2.5 cm
    (B) 5.0 cm
    (C) 7.5 cm
    (D) 10 cm

12. Non-uniform compaction may cause the concrete
    (A) Porous
    (B) Non-homogeneous
    (C) Reduced strength
    (D) All the above

13. Modulus of rupture of concrete is a measure of
    (A) Flexural tensile strength
    (B) Direct tensile strength
    (C) Compressive strength
    (D) Split tensile strength

14. M10 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

15. Higher workability of concrete is required if the structure is
    (A) Made with cement concrete
    (B) Thick and reinforced
    (C) Thin and heavily reinforced
    (D) Thick and heavily reinforced

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