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30 important objective questions of RCC

Ques 1) How is the deflection in RC beams controlled as per IS:456 ?
(a) by using large aspect ratio
(b) by using small modular ratio
(c) by controlling span/depth ratio
(d) by controlling water cement ratio

Ques 2) In a cantilever beam carrying gravity load, main reinforcement is provided 
(a) above the neutral axis
(b) as vertical stirrups
(c) as a helical reinforcement
(d) below the neutral axis

Ques 3) The minimum grade for hydraulic structure as per IS code recommendation is 
(a) M15
(b) M20
(c)M30
(d)M40

Ques 4) Normally pre-stressing wires are arranged in the
(a) upper part of the beam
(b)lower part of the beam
(c) centre
(d) anywhere

Ques 5) The ratio of permissible shear stress in LSM of design and WSM of design is 
(a) 25:16
(b) 5:4
(c) 16:25
(d) 4:5

Ques 6)  Lever arm is the distance between 
(a) centre of tensile and compressive zone
(b) centre of tensile zone and bottom most layer of beam
(c) The resultant compressive force and tensile force
(d) None of these

Ques 7) When shear stresss exceeds the permissible limit in a slab, then it is reduced by
(a)  Increasing the depth
(b) providing shear reinforcement
(c)using high strength steel
(d) using thinner bars but more in number

Ques 8) In a reinforced concrete retaining wall, a shear key is provided, if the
(a) shear stress in the vertical stem is excessive
(b) shear force in the toe slab is more than that in the heel slab
(c) Retaining wall is not safe against sliding
(d) Retaining wall is not safe against overturning

Ques 9) What is the anchorage value of a standard hook of a reinforced bar of dia 'D' ?
(a) 4D
(b) 8D
(c) 12D
(d)16D

Ques 10) If a reinforced beam fails in bond, its bond strength can be increased by 
(a)  Increasing the depth of beam
(b) Using thinner bars but more in numbers
(c) Using thicker bars but less in numbers
(d) Providing vertical stirrups

Ques 11) Side face reinforcement in deep beams is equal to
(a) 0.01% of web area
(b) 0.02% of web area
(c) 0.1% of web area
(d) 1% of web area

Ques 12)  Minimum grade of concrete for post-tensioned prestressed concrete is 
(a) M20
(b) M30
(c) M40
(d) M60

Ques 13) Characteristic strength has _________% reliability
(a) 5
(b) 10
(c) 50
(d) 95

Ques 14) The maximum strain in concrete at the outermost compression fiber is taken as
(a) 0.035
(b) 0.002
(c) 0.0035
(d) none of these

Ques 15)  In a T-beam, the breadth of the rib is equal to the 
(a) total thickness of the slab
(b) width of the portion of the beam in the compression zone
(c) width of the portion of the beam in the tensile zone
(d) None of the above

Ques 16)  The ratio of the maximum and minimum percentage of the longitudional bars provided in a column is 
(a) 6
(b) 7.5
(c) 5
(d) 8 

Ques 17)  Minumum percentage elongation for CRS/TMT bars is 
(a) 10%
(b) 12%
(c) 15%
(d) 20%

Ques 18) In case of hand mixing of concrete, the extra cement to be added is
(a) 5%
(b) 10%
(c) 15%
(d) 20%

Ques 19) Increase in the moisture content in concrete
(a) reduces the strength
(b) Increases the strength
(c) Does not change the strength
(d) All of the above

Ques 20) Air entrainment in the concrete increase
(a) Workability
(b) Strength
(c) The effects of temperature variations
(d) The unit weight

Ques 21) A higher modular ratio shows 
(a) Higher compressive strength of concrete
(b) Lower compressive strength of concrete
(c) Higher tensile strength of steel
(d) Lower tensile strength of steel

Ques 22) The purpose of reinforcement in pre-stressed concrete is
(a) To provide adequate bond stress
(b) To resist tensile stresses
(c) To impart initial compressive stress in concrete
(d) All of the above

Ques 23) Which of the following losses of pre-stress occurs only in pre-tensioning and not in post-tensioning ?
(a)  Elastic shorting of concrete
(b) Shrinkage of concrete
(c) Creep of concrete
(d) Loss due to friction

Ques 24) High carbon content in the steel causes 
(a) Decrease in tensile strength but increases in ductility
(b) Increases in tensile strength but decreases in ductility
(c) Decrease in both
(d) Increase in both

Ques 25) Ratio of compressive strength to tensile strength of concrete
(a) Increases with age
(b) Decreases with age
(c) Remains constant
(d) None of the above

Ques 26) Endurance limit of mild steel is approximately equal to 
(a) 0.3
(b) 0.5
(c) 0.7
(d) 0.8

Ques 27)  For bridge slabs, the amount of traverse reinforcement is taken as
(a) 0.15% of gross concrete area
(b) 0.30% of gross concrete area
(c) 0.45%  of gross concrete area
(d)0.60% of gross concrete area

Ques 28) When a masonary wall known as a shear wall ?
(a) If the earthquake load is out of plane
(b) If the earthquake load is in plane
(c) It it is unreinforced
(d) If it is placed as in fill to the flame

Ques 29) Minimum percentage elongation for mild steel is about\
(a) 10-12%
(b) 10-15%
(c) 15-20%
(d) 20-22%

Ques 30) Circular slab is used for
(a) Roof of pump houses constructed above tube wells
(b) Roof of a traffic control post at the intersection of roads
(c) Floor of circular water tanks
(d) All of these

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