Concrete Technology and R.C.C. Design MCQs (Diploma Civil 3rd Year)

Q1. Mass of half bag of ordinary portland cement is

1. A. 25 Kg
2. B. 30 Kg
3. C. 50 Kg
4. D. 40 Kg

Q2. Compressive strength of 1 N/mm² is nearly equivalent to

1. A. 1000 Kg/mm²
2. B. 10 Kg/mm²
3. C. 1 Kg/mm²
4. D. 0.1 Kg/mm²

Q3. Plain cement concrete is strong in

1. A. compression
2. B. shear
3. C. tension
4. D. all of these

Q4. Cement used for concrete structures under sea water is

1. A. high alumina
2. B. Ordinary Portland
3. C. low heat
4. D. Slag

Q5. Most suitable cement used in constructions in sea water is

1. A. Low heat cement
2. B. High alumina
3. C. Super Sulphate
4. D. Ordinary Portland

Q6. Compression is produced in tension zones of R.C.C. structures prior to external loading in such designing due to

1. A. pre-stressing
2. B. working stress
3. C. pre-cast
4. D. limit state

Q7. Steel used in ordinary R.C.C. works is

1. A. high carbon steel
2. B. stainless steel
3. C. wrought iron
4. D. mild steel

Q8. Algebraic sum of vertical forces at any section of a beam is

1. A. bending moment
2. B. shear force
3. C. deflection
4. D. bending stress

Q9. Beam needs shear reinforcement in case of exceeding shear stress to the permissible shear stress that is ........ of the bending stress.

1. A. 1/100
2. B. 1/5
3. C. 1/10
4. D. 1/20

Q10. Tensile strength of concrete as compared to its compressive strength is as

1. A. 10%
2. B. 50%
3. C. 0
4. D. 5%

Q11. The percentage of minimum reinforcement of the gross cross-sectional area of slab is, while fc' = 3000 Psi and fy = 60000 Psi

1. A. 0.15%
2. B. 0.20%
3. C. 0.10%
4. D. 0.33%

Q12. Beams reinforced with steel in compression and tension are known as

1. A. balanced
2. B. overlapping
3. C. doubly reinforced
4. D. critical

Q13. For a room size of 8 m × 6 m, the slab designed will be as

1. A. two way
2. B. overlapping
3. C. cantilever
4. D. one way

Q14. A beam having flange on one side is called

1. A. Primary Beam
2. B. L - Beam
3. C. T - Beam
4. D. Secondary Beam

Q15. Maximum slenderness ratio of a short column is

1. A. 30
2. B. 18
3. C. 15
4. D. 20

Q16. A stair supported over stringer beam is called

1. A. Straight
2. B. Dog legged
3. C. Vertically spanning
4. D. Horizontally spanning

Q17. Initial setting time of ordinary portland cement should not be less than

1. A. 15 mins
2. B. 30 mins
3. C. 10 HRC
4. D. 60 mins

Q18. Under same conditions, strength of concrete depends upon

1. A. water-cement ratio
2. B. nature of bond
3. C. bond strength
4. D. shear strength

Q19. Grey colour of cement is due to

1. A. gypsum
2. B. iron oxide
3. C. silica
4. D. Boxite

Q20. At the time of casting of concrete thickness of layer should not be more than

1. A. 4 in.
2. B. 6 in.
3. C. 3 in.
4. D. 10 in.

Q21. Concrete used for construction of large structures like Dams, etc. is

1. A. polymer concrete
2. B. vacuum concrete
3. C. light weight concrete
4. D. mass concrete

Q22. Steel is stretched before casting of concrete in

1. A. post-casting
2. B. pre-casting
3. C. post-tensioning
4. D. pre-tensioning

Q23. Coefficient of thermal expansion of concrete and steel is

1. A. same
2. B. nearly same
3. C. 1:10
4. D. 1:2

Q24. Maximum load that a member can bear in its life is

1. A. ultimate load
2. B. curtail load
3. C. crippling load
4. D. safe load

Q25. Stirrups are provided in beams to check

1. A. shear
2. B. tension
3. C. compression
4. D. all of these