WorksheetsRCC Structures Unit 3 MCQ Practice Questions
Total questions: 50
Worksheet time: 25mins
A one-way slab bends primarily in which direction?
Both directions
Shorter span direction
Longer span direction
Diagonal direction
As per IS 456:2000, the slab is considered one-way if the ratio of longer span to shorter span is greater than:
1.5
2.0
2.5
1.0
The main reinforcement in a one-way slab is provided :
Both directions equally
Perpendicular to the shorter span
Along the longer span
Along the shorter span
The minimum clear cover for a slab exposed to moderate conditions should be:
15 mm
25 mm
20 mm
30 mm
In a one-way slab, the distribution steel is provided to:
Carry bending moment
Resist torsion
Control temperature and shrinkage stresses
Provide shear resistance
The maximum spacing of main reinforcement in a one-way slab shall not exceed the lesser of:
3d or 300 mm
3d or 450 mm
3d or 500 mm
3d or 250 mm
Effective span of a simply supported one-way slab is:
Clear span + depth
Clear span – half width of support
Lesser of (clear span + effective depth) or center-to-center of supports
Clear span only
Minimum percentage of tension reinforcement for slab (Fe415) as per IS 456 is:
0.12%
0.15%
0.10%
0.25%
Minimum percentage of tension reinforcement for slab (Mild steel) as per IS 456 is:
0.12%
0.15%
0.10%
0.25%
Distribution steel is placed in which direction in one-way slab?
Longer span
Shorter span
Diagonal
Vertical
The maximum spacing of distribution bars in one-way slab is:
3d or 300 mm
3d or 450 mm
5d or 300 mm
5d or 500 mm
Crack width in slab is controlled by:
Shear reinforcement
Bar spacing and cover
Concrete strength only
Beam size
Bending moment in simply supported one-way slab under UDL
wL²/8
wL²/12
wL²/16
wL²/10
The one-way slab primarily resists:
Shear
Axial load
Bending
Torsion
Minimum width of slab for one-way action is:
1.5 m
2.0 m
3.0 m
Depends on span ratio
Slabs are designed for:
Only dead load
Dead + Live + Floor finish load
Dead + Wind
None
Slab thickness is usually governed by:
Ultimate moment
Deflection control
Steel cost
Dead load
Which type of reinforcement is called the main reinforcement in a one-way slab?
Top reinforcement supported along the longer span
Bottom reinforcement provided in the shorter span direction
Top reinforcement provided in the transverse direction
Bottom reinforcement placed in the longer span direction
A slab is considered a two-way slab when:
Longer span is more than twice the shorter span
Longer span is less than twice the shorter span
Slab is supported on two sides only
Slab is simply supported on all sides
In two-way slabs, the bending occurs:
Only in shorter direction
Only in longer direction
In both directions
In diagonal direction
For a simply supported two-way slab, the corners will:
Lift upward
Deflect more
Remain at the same level
Be restrained from lifting
For a Restrained two-way slab, the corners will:
Lift upward
Deflect more
Remain at the same level
Be restrained from lifting
The minimum thickness of a two-way slab as per IS 456:2000 is based on:
Span/depth ratio
Bending moment
Shear force
Torsion
The distribution of moments in a two-way slab is determined using:
Yield line theory
Rankine method
Moment distribution method
Moment coefficients from IS 456:2000
The distribution of loads from slab to beam is determined using:
Yield line theory
Rankine method
Moment distribution method
Moment coefficients from IS 456:2000
In a two-way slab, torsional reinforcement is provided at:
Edges
Center
Corners
Mid-span
The minimum clear cover to main reinforcement in a slab is:
20 mm
25 mm
If corners of a slab are prevented from lifting, torsion bars are:
Provided
Not required
Doubled
Ignored
The live load for residential slabs as per IS 875 Part 2 is:
1.5 kN/m²
4.0 kN/m²
2.0 kN/m²
5.0 kN/m²
The reinforcement in the longer span of a two-way slab is usually:
Greater than in shorter span
Less than in shorter span
Equal to shorter span
Not provided
In two-way slabs, moment coefficients are based on:
Area of slab
Aspect ratio (Ly/Lx)
Thickness only
Live load
The maximum shear stress in a slab is generally found at:
Mid span
Edges
Points of concentrated loads
Near the supports
The primary purpose of the shear check in slabs is to ensure:
Adequate thickness
Sufficient reinforcement for bending
The slab can resist shear stresses
Proper slab deflection
In two-way slabs, shear is resisted by:
Only the main reinforcement
A combination of concrete and reinforcement
Only concrete
Only the distribution reinforcement
The width of the edge strip in a two-way slab is taken as:
The full width of the slab
One-half of the slab width
0.125 times the slab length
0.75 times slab length
The reinforcement in the edge strip of a two-way slab is typically:
Higher than in the middle strip
The same as in the middle strip
Less than in the middle strip
Not required
The edge strip and middle strip concept is used for designing which type of slab?
Cantilever slab
One-way slab
Two-way slab
Continuous slab
The width of the Middle strip in a two-way slab is taken as:
The full width of the slab
Half of the slab width
0.125 times the slab length
0.75 times of slab length
Which of the following factor/factors influence the deflection of two-way slabs?
Type of reinforcement used
Load intensity
Span-to-depth ratio
All the above
In the IS 456: 2000 code for reinforced concrete design, the final deflection limit for a slab under service loads including the temperature and creep effects is generally taken as:
L/250
L/350
L/200
L/300
In the IS 456: 2000 code for reinforced concrete design, the deflection limit after finishes for a slab under service loads including the temperature and creep effects is generally taken as:
L/250
L/350
20 mm
Lesser of B & C
Which of the following is the one way slab?
3m*5m
3m*6m
4m*8m
3m*8m
Which of the following is a primary function of the distribution reinforcement?
It distributes the load more evenly on the slab
It prevents the shrinkage and temperature effect
It keeps the main reinforcement in position
It works as the main reinforcement
What is the span to overall depth ratio for control of deflection in simply supported two way slab with mild steel reinforcement?
40
20
26
35
The maximum diameter of reinforcement in a slab is limited to
1/4 of the total slab thickness
1/6 of the total slab thickness
1/8 of the total slab thickness
1/10 of the total slab thickness
Which of the following pairs correctly express the moment in the shorter span and longer span of two way slab?
Mx = αx * w * Lx² My = αy * w * Ly²
Mx = αx * w * Lx² My = αy * w * Lx²
Mx = αx * w * Ly² My = αy * w * Lx²
Mx = αx * w * Ly² My = αy * w * Ly²
Cranking of reinforcement in two way slab is done in
All four sides
Along two shorter sides
Along to longer sides
None of the above
Which of the following is the two way slab?
2m*5m
3m*7m
4m*5m
2m*6m
If Ly/Lx ratio is equal to 2 then the slab is classified as
One way slab
Two way slab
Cannot be defined
Both A & B
Cranking of reinforcement in two way slab is done for
Short span reinforcement
Long span reinforcement
Both A & B
Cranking not provided
