Concrete Technology MCQs with Answers - Set 13 - ObjectiveBooks

# Practice Test: Question Set - 13

1. According to IS: 4561978, minimum slenderness ratio for a short column is
(A) Less than 12
(B) Less than 18
(C) Between 18 and 24
(D) More than 24

2. Water cement ratio is
(A) Volume of water to that of cement
(B) Weight of water to that of cement
(C) Weight of concrete to that of water
(D) Both (a) and (b) of the above

3. For a concrete mix 1 : 3 : 6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is
(A) 10 kg
(B) 12 kg
(C) 14 kg
(D) 16 kg

4. Half of the main steel in a simply supported slab is bent up near the support at a distance of ‘x’ from the center of slab bearing where ‘x’ is equal to (Where ‘l’ is the span)
(A) l/3
(B) l/5
(C) l/7
(D) l/10

5. Pick up the incorrect statement from the following:
(A) In properly graded aggregates, bulk density is more
(B) In single size aggregates, bulk density is least
(C) In single size aggregates, bulk density is maximum
(D) None of these

6. To prevent segregation, the maximum height for placing concrete, is
(A) 100 cm
(B) 125 cm
(C) 150 cm
(D) 200 cm

7. For a simply supported beam of span 15 m, the minimum effective depth to satisfy the vertical deflection limits should be
(A) 600 mm
(B) 750 mm
(C) 900 mm
(D) More than 1 m

8. For compacting plain concrete road surface of thickness less than 20 cm, we use
(A) Internal vibrator
(B) Screed vibrator
(C) Form vibrator
(D) None of these

9. Expansion joints are provided if the length of concrete structures exceeds
(A) 10 m
(B) 15 m
(C) 25 m
(D) 45 m

10. The permissible diagonal tensile stress in reinforced brick work is
(B) Zero
(C) 0.3 N/mm² to 0.7 N/mm²

11. Pick up the correct statement from the following:
(A) According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight
(B) According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular and flaky
(C) According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed and porous
(D) All the above

12. Pick up the correct statement from the following:
(A) The concrete gains strength due to hydration of cement
(B) The concrete does not set at freezing point
(C) The strength of concrete increases with its age
(D) All the above

13. The critical section for finding maximum bending moment for footing under masonry wall is located
(A) At the middle of the wall
(B) At the edge of the wall
(C) Halfway between the middle and edge of the wall
(D) At a distance equal to effective depth of footing from the edge of the wall

14. Separation of water or water sand cement from a freshly concrete, is known
(A) Bleeding
(B) Creeping
(C) Segregation
(D) Flooding

(A) A horizontal line
(B) A vertical line
(C) N.W. inclined line
(D) N.E. inclined line

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