Concrete Technology Objective Questions with Answers pdf - Set 17 - ObjectiveBooks

Concrete Technology Objective Questions with Answers pdf - Set 17

Practice Test: Question Set - 17

1. The minimum cover to the ties or spirals should not be less than
    (A) 15 mm
    (B) 20 mm
    (C) 25 mm
    (D) 50 mm

2. According to Water-Cement Ratio Law, the strength of workable plastic concrete
    (A) Depends upon the amount of water used in the mix
    (B) Does not depend upon the quality of cement mixed with aggregates
    (C) Does not depend upon the quantity of cement mixed with aggregates
    (D) All the above

3. Sands of zone-I are:
    (A) Course
    (B) Medium
    (C) Medium to fine
    (D) Fine

4. According to Whitney's theory, ultimate strain of concrete is assumed to be
    (A) 0.03 %
    (B) 0.1 %
    (C) 0.3 %
    (D) 3 %

5. The condition not applicable to water cement ratio law, is
    (A) Internal moisture conditions on hydration continue till complete strength is gained
    (B) Concrete specimens may be tested at any temperature
    (C) Concrete specimens need be of same age
    (D) Concrete specimens need be of same size

6. If the slump of a concrete mix is 60 mm, its workability is
    (A) Very low
    (B) Low
    (C) Medium
    (D) High

7. Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned work respectively should not be less than
    (A) 35 MPa and 42 MPa
    (B) 42 MPa and 35 MPa
    (C) 42 MPa and 53 MPa
    (D) 53 MPa and 42 MPa

8. The void ratio of
    (A) Single size coarse aggregate is roughly 0.45
    (B) Graded coarse aggregate is roughly 0.040
    (C) Fine aggregate is roughly 0.45
    (D) All the above

9. According to IS : 382-1963, a good aggregate should be
    (A) Chemically inert
    (B) Sufficiently strong
    (C) Hard and durable
    (D) All the above

10. The compressive strength of 100 mm cube as compared to 150 mm cube is always
    (A) Less
    (B) More
    (C) Equal
    (D) None of the above

11. The diameter of the Vicat plunger is 10 mm and its length varies from
    (A) 20 mm to 30 mm
    (B) 30 mm to 40 mm
    (C) 40 mm to 50 mm
    (D) 50 mm to 60 mm

12. Gypsum is added for
    (A) Color
    (B) Strength
    (C) Controlling setting time
    (D) None of these

13. Modulus of elasticity of steel as per IS: 4561978 shall be taken as
    (A) 20 kN/cm2
    (B) 200 kN/cm2
    (C) 200 kN/mm2
    (D) 2 × 106 N/cm2

14. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is
    (A) 100 kg/cm2
    (B) 150 kg/cm2
    (C) 200 kg/cm2
    (D) 250 kg/cm2

15. The cement becomes useless if its absorbed moisture content exceeds
    (A) 1 %
    (B) 2 %
    (C) 3 %
    (D) 5 %

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