MHADA Exam Concrete Technology And Design Of Concrete Structures MCQ Mock Test 35

 

1➤ High carbon content in the steel causes

decrease in tensile strength but increase in ductilityincrease in tensile strength but decrease in ductilitydecrease in both tensile strength and ductilityincrease in both tensile strength and ductility

2➤ The slab is designed as one way if the ratio of long span to short span is

less than 1between 1 and 1.5between 1.5 and 2greater than 2

3➤ A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

1.52.02.53.0

4➤ According to IS : 456- 1978, minimum slenderness ratio for a short column is

more than 24between 18 and 24less than 18less than 12

5➤ Maximum percentage reinforcement in case of slabs is limited to

2468

6➤ The property of fresh concrete, in which the water in the mix tends to rise to the surface while placing and compacting, is called

segregationbleedingbulkingcreep

7➤ A T-shaped retaining wall mainly conssits of

one cantilevertwo cantileversthree cantileversfour cantilevers

8➤ In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on

front face onlyinner face onlyboth front face and inner facenone of the above

9➤ The average permissible stress in bond for plain bars in tension is

increased by 10% for bars in compressionincreased by 25% for bars in compressiondecreased by 10% for bars in compressiondecreased by 25% for bars in compression

10➤ Poisson’s ratio for concrete

remains constantincreases with richer mixesdecreases with richer mixesnone of the above

11➤ The minimum cover in a slab should neither be less than the diameter of bar nor less than

10mm15mm25mm13mm

12➤ For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

15 mm25 mm30 mm40 mm

13➤ Minimum thickness of load bearing RCC wall should be

50 mm150 mm100 mm200 mm

14➤ The recommended value of modular ratio for reinforced brick work is

18304058

15➤ The permissible diagonal tensile stress in reinforced brick work is

about 0.1 N/mm²zero0.3 N/mm² to 0.7 N/mm²about 1.0 N/mm²

16➤ Shrinkage of concrete depends upon i) humidity of atmosphere ii) passage of time iii) stress The correct answer is

(i) and (ii)(ii) and (iii)only (iii)All (i), (ii) and (iii)

17➤ In counterfort type retaining walls i) the vertical slab is designed as a continuous slab ii) the heel slab is designed as a continuous slab iii) the vertical slab is designed as a cantilever iv) the heel slab is designed as a cantilever The correct answer is

(i) and (ii)(i) and (iv)(ii) and (iii)(iii) and (iv)

18➤ 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

(i) and (iii)(i) and (iv)(ii) and (iii)(ii) and (iv)

19➤ In a ring beam subjected to uniformly distributed load i) shear force at mid span is zero ii) shear force at mid span is maximum iii) torsion at mid span is zero iv) torsion at mid span is maximum The correct answer is

(i) and (iii)(i) and (iv)(ii) and (iii)(ii) and (iv)

20➤ The depth of footing for an isolated column is governed by i) maximum bending moment ii) shear force iii) punching shear The correct answer is

only (i)(i) and (ii)(i) and (iii)(i), (ii) and (iii)

21➤ 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

only (i)only (ii)both (i) and (iv)both (ii) and (iii)

22➤ The main reinforcement in the toe of a T- shaped R C. retaining wall is provided on i) top face parallel to the wall ii) top face perpendicular to the wall iii) bottom face paralleUo the wall iv) bottom face perpendicular to the wall The correct answer is

only (ii) is correct(i) and (ii) are correct(iii) and (iv) are correctonly (iv) is correct

23➤ Select the correct statement

Elastic modulus of high tensile steel is nearly the same as that of mild steelElastic modulus of high tensile steel is more than that of mild steelCarbon percentage in high carbon steel is less than that in mild steelHigh tensile steel is cheaper than mild steel

24➤ Select the incorrect statement

Lean mixes bleed more as compared to rich ones.Bleeding can be minimized by adding pozzuolana finer aggregate.Bleeding can be increased by addition of calcium chloride.none of the above

25➤ Select the incorrect statement

The loss of prestress is more in pre-tensioning system than in post-tensioning system.Pretensioning system has greater certainty about its durability.For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning systemnone of the above

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