Reinforced Cement Concrete 80 Questions with Answers
1.
Strength of concrete is maximum in :
A. Compression
B.
Shear
C.
Twisting
D.
Fatigue
Answer: Option A
2. If the initial setting time of a
cement is 10 min, it can be classified as,
A. Low
heat cement
B.
Quick setting cement
C.
Rapid hardening cement
D.
Sulphate resisting cement
Answer: Option B
3. Minimum quantity of cement/m^3 of RCC
for mild exposure in,
A. 150
kg
B.
250 kg
C.
350kg
D.
300kg
Answer: Option D
4.
The
factor of safety for
A. Steel
& concrete are same
B.
Steel is lower than that of concrete
C.
Steel is higher than that of concrete
D.
None
Answer: Option B
5. For steel of grade fY=500 N/mm2
the value of Xumax/d is
A. 0.48 B. 0.46
C. 0.53 D.
0.43
Answer: Option B
6. The maximum stress in compression
steel, if mild steel is used is
A. 0.87 fY B. <0.87 fY
C. fY D.
0.67 fY
Answer: Option A
7.
As
the value of d’/d increases, the stress in compression steel for Fe415 bars
A. Increase
B.
Decrease
C.
Not predictable
D.
None
Answer: Option B
8.
Deflections
of doubly reinforced beams are… compared to singly reinforced beams of same
depth
A. More B.
Less
C. Equal
D. None
Answer: Option B
9. In T beams the Web and flange are more
effective in resisting
A. Bending
stress and shear stress respectively
B.
Shear stress and bending stress respectively
C.
Both bending and shear
D.
None of the above
Answer: Option B
10.
A T beam behaves as a rectangular beam of
width equal to its flange if its neutral axis
A. Coincides
with centroid of reinforcement
B.
Coincides with centroid of T section
C.
Remains within the flange
D.
Remains in the
web
Answer: Option C
11.
Failure of RCC beam due to shear can only
occur on account of
A. Diagonal
compression
B.
Diagonal tension
C.
Web compression
D.
None
Answer: Option A
12.
Diagonal tension reinforcement is provided in
a beam as
A. Longitudinal
bars
B.
Bent up bars
C.
90 degree bend at the bends of main bars
D.
Helical reinforcement
Answer: Option B
13.
Distribution
of shear stress over rectangular RC section of a beam follows
A. Circular
curve
B.
Straight line
C.
Parabolic curve till NA
D.
An elliptical curve
Answer: Option C
14.
A beam is designed for UDL causing compression
in the supporting column. Where is the critical section for shear
A. A
distance of d/2 from the face of the support
B.
A distance d from the support
C.
At the center of the support
D.
At the face of support
Answer: Option B
15.
Critical section for shear in case of flat
slabs is at a distance of
A.
Effective depth of slab from periphery of column/drop
panel
B.
d/2 from the periphery of column/capital/drop panel
C.
At the drop panel of slab
D.
At the periphery of column
Answer: Option B
16.
Which one of the following sections of equal
cross sectional area resist the torsional moment of a RCC beam section more
efficiently
A. An
unsymmetrical I section
B.
A box section
C.
A solid rectangular section
D.
A symmetrical I section
Answer: Option B
17.
The crack pattern at failure due to torsion is
A.
Vertical
B.
Diagonal at ends
C.
Spiral
D.
Circular
Answer: Option C
18.
The transverse torsional reinforcement in RCC
beam is
A. Vertical
stirrups
B.
Inclined stirrups
C.
Bent up bars
D.
All of the above
Answer: Option A
19. If the value of Ï„v < Ï„c
in a section subjected to torsion
A. Torsional
design is a must
B.
Torsional design is not a must
C.
The beam fails by diagonal compression failure.
D.
Shear reinforcement is not required
Answer: Option B
20.
A canopy beam will be subjected to
A. Primary
torsion
B.
Secondary torsion
C.
Only bending moment
D.
Only BM & SF
Answer: Option A
21.
The minimum cover in a slab should neither be
less than diameter of bar nor less than
A. 10 mm B. 15 mm
C. 20 mm D. 30 mm
Answer: Option C
22.
The minimum reinforcement in a slab takes care
of
A.
Temperature and Shrinkage stresses
B.
Homogeneity of slab
C.
Support to main reinforcement
D.
All of the above
Answer: Option D
23.
The plaster thickness of the ceiling of slabs
A. Can
be included in the cover to the reinforcement
B.
Should not be included in the cover
C.
Provided nominal cover
D.
None of the above
Answer: Option B
24.
The minimum cover to the ties or spirals
should not be less than
A. 15 mm B. 20 mm
C. 25 mm D. 50 mm
Answer: Option C
25.
The
effective length i=of column in building frames given in IS 456 2000 are based on
A. Wood’s
tables
B.
Wrestler’s tables
C.
Mohr’s tables
D.
Bresler’s tables
Answer: Option A
26.
The elements that are normally subjected to
combined bending and axial force are
A. Struts
in reinforced concrete members
B.
Space Truss member
C.
The members in the long span bridges
D.
Columns in framed structures
Answer: Option D
27.
The use of lateral ties in a column is
A. To
keep main reinforcement in position
B.
To take care of shear developing due to buckling
C.
To give confinement to concrete in the core
D.
To increase ductility of the column
Answer: Option A
28.
The maximum compressive strain in RCC column
when the minimum strain at one edge is 0.001
A. <0.0035
B.
>0.0025
C.
<0.00275
D.
0.00275
Answer: Option C
29.
All columns are designed for a minimum
eccentricity of
A. 5mmm B. 15mm
C. 20mm D.
25mm
Answer: Option C
30.
A 5m long square RCC column is fixed at one
end and hinged at other and has minimum radius of gyration hundred mm. Its
slenderness ratio is
A. 50mm B. 40mm
C. 32.5mm D. 20mm
Answer: Option B
31.
A column has more cross sectional area than
that required to carry the load, then minimum percentage of steel is calculated
based on
A. Actual
area
B.
Area required to carry the load
C.
Area excluding clear cover
D.
None
Answer: Option A
32.
The maximum limit of 6% of reinforcement for
columns is specified in IS 456bis based on
A. Column
with more reinforcement than 6% is unsafe
B.
Column with more reinforcement will be
economical
C.
Reinforcement will create difficulties in
placing and compaction of concrete
D.
None
Answer: Option C
33.
The depth of foundation is computed by
A. Rankine’s
formula
B.
Coulomb’s formula
C.
Winkler’s formula
D.
Rankine Grasho formula
Answer: Option A
34.
The
permissible bearing stress for M20 concrete column resting on a rectangular
concrete footing in limit state method of design should not be more than
A. 10 Mpa B. 9 Mpa
C. 11 Mpa D.
20 Mpa
Answer: Option B
35.
The development length of each bar of bonded
bars shall be that for individual bar, increased by ----% for 2 bars in
contact,-----% for 3 bars in contact,----% for 4 bars in contact
A. 10,20,30
B.
10,33,20
C.
20,30,10
D.
10,20,33
Answer: Option D
36.
For full anchorage, the stirrups should extend
by a length of ---- times diameter of bar when bent at 135 degree
A. 4Ç¿ B. 8Ç¿
C. 12Ç¿ D.
6Ç¿
Answer: Option D
37.
A bar of 10mm diameter is embedded in concrete
for a distance of 10cm. Calculate the maximum load which the bar can take if
the bond if the bond stress is 0.6 N/mm2
A. 1.5 KN B. 1.9 KN
C. 2 KN D.
2.5 KN
Answer: Option B
38.
The design bond stress for deformed bars in
compression is 3MPa. The corresponding bond stress for same bars in tension is
A. 1.5
Mpa
B.
3.75 Mpa
C.
4.5 Mpa
D.
2.4 Mpa
Answer: Option D
39.
Which one of the following is correct when
HYSD bar are used in place of mild steel bars in beam, the bond strength
A. Does
not change
B.
Increase
C.
Decrease
D.
Becomes zero
Answer: Option B
40.
Maximum spacing of main steel is restricted in
slab from --- criteria
A. Crack
width criteria
B.
Deflection criteria
C.
Creep criteria
D.
Temperature criteria
Answer: Option A
41.
The minimum tension steel in RCC beam needs to
be provided to
A. Prevent
sudden failure
B.
Arrest crack width
C.
Control excessive deflection
D.
Prevent surface hair cracks
Answer: Option A
42.
For the same cross sectional area which of the
following beams deflect more
A. Circular
beam
B.
I section
C.
Rectangular beam
D.
T beam
Answer: Option A
43.
For
a simply supported beam of span 15m, the minimum effective depth to satisfy the
vertical deflection limit is
A. 600mm
B.
750mm
C.
900mm
D.
More than 1m
Answer: Option D
44.
The effect of creep on modular ratio is
A. To
increase it
B.
To decrease it
C.
Either to decrease or to increase it
D.
To keep it unchanged
Answer: Option a
45.
In limit state state approach, spacing of main
reinforcement controls primarily
A. Collapse
B.
Cracking
C.
Deflection
D.
Durability
Answer: Option B
46.
In limit state design of reinforced concrete,
the deflection is computed by using
A. Initial
tangent modulus
B.
Secant modulus
C.
Tangent modulus
D.
Short and long term values of Young’s modulus
Answer: Option D
47.
The loads to be taken corresponding to limit
states of strength, deflection and crack width are respectively
A. Working
load, working load and working load
B.
Ultimate load, working load and ultimate load
C.
Ultimate load, ultimate load and working load
D.
Ultimate load, working load and working load
Answer: Option D
48.
Prestressing of concrete members is effective
in
A. Columns
B.
Walls
C.
Railway sleepers
D.
Struts
Answer: Option C
49.
To ensure durability of prestressed concrete exposed
to sea water, the maximum water cement ratio specified by IS 1343 is,
A. 0.75 B. 0.65
C. 0.5 D. 0.45
Answer: Option D
50.
Which of the following systems of prestressing
is suitable for pre tensioned memders
A. Freyssinet
system
B.
Magnel Blaton system
C.
Hoyer system
D.
Gifford Udall system
Answer: Option C
51. The maximum area of tension and compression reinforcement in beams as per IS 456:2000 shall
not
exceed
A. 0.15%
of gross area B. 1.5% of gross area
C. 4%
of gross area D. 1% of gross area
Answer: Option C
52. As per I.S. 456 - 2000, the pH value of
water used
for construction shall be
A. less than 6 B. equal to 6
C. not less than 6 D. equal to 7
Answer: Option C
53. Cantilever retaining walls can safely be
used for a height not more than
A. 6 B. 7
C. 5 D. 4
Answer: Option A
54. The diameter of longitudinal bars of a
column should never be less than
A. 6
mm B. 8
mm
C. 10 mm D. 12 mm
Answer:
Option
D
55. In an RCC Beam, side face reinforcement is provided
if its depth exceeds
A. 300mm B.
500mm
C. 700mm D.
750mm
Answer:
Option
D
56. In limit state design, the maximum limit imposed by
IS: 456-2000 on the
redistribution
of moment in statically indeterminate beams is
A.10% B.
15%
C.
20% D.30%
Answer: Option D
57. According to IS: 456-2000, the maximum strain in
concrete at the outer most
compression
fiber in the limit state design of flexural member is
A. 0.0020 B. 0.0035
C. 0.0050 D. 0.0065
Answer: Option B
58. According to I.S.: 456, 2000 the minimum thickness
of reinforced concrete
footings
resting on piles shall not be less than
A. 200 mm B. 300 mm
C. 400 mm D. 500 mm
Answer: Option B
59. The minimum clear cover for R.C.C. columns shall
be
A. Greater of 40 mm or diameter
B. Smaller of 40 mm or diameter
C. Greater of 25 mm or diameter
D. Smaller of 25 mm or diameter
Answer: Option B
60. As per
IS: 456, the reinforcement in a column should not be less than
A. 0.5% and not more than
5% of cross sectional area
B. 0.6% and not more than
6% of cross sectional area
C. 0.7% and not more than
7% of cross sectional area
D. 0.8% and not more than
6% of cross sectional area
Answer: Option D
61. The partial safety factor for steel as per IS:
456-2000 is taken as
A. 1.15
B.
1.50
C.
1.65
D.
1.35
Answer: Option A
62. According to IS :456-2000 ,the maximum strain
in the tension reinforcement in the section at failure should not be less than
A.
B.
C.
D.
Answer:
Option
C
63. Minimum grade of concrete for water
tank
A.
M15
B.
M20
C.
M25
D.
M30
Answer:
Option
B
64.
According
to IS456:2000; modules of elasticity of concrete Ec ( Mpa) is given by:
A.
5700
B.
5000fck
C. 5000
D
Answer:
Option
D
65.
The
partial safety factor for steel in L.S of serviceability is
A.
1.2
B.
1.5
C.
1
D.
0.8
Answer: Option C
66.
For
avoiding LS of collapse which of the following load combinations aren’t
considered
A.
0.9DL
+ 1.5WL
B.
1.5DL
+ 1.5WL
C.
1.5DL
+ 1.5WL +1.5EL
D.
1.2
(DL + LL+ WL)
Answer:
Option
C
67.
Maximum
distance between expansion joint in concrete
as per IS 456/2000 is:
A.
20m
B.
45m
C.
30m
D.
60m
Answer:
Option
B
68.
Approximate
value of shrinkage strain of concrete is ,
A. 0.0003
B.
3 × 10 ^-4
C.
0.0035
D.
0.002
Answer:
Option
B
69. The minimum thickness of a flat slab required according to IS 456
2000 is
A.
125mm
B.
150mm
C.
100mm
D.
200mm
Answer:
Option
A
70. The minimum percentage of high yield strength deformed bars in RCC
slab is
A.
0.4
B.
0.15
C.
0.12
D.
0.2
Answer:
Option
C
71. For a bar of diameter d, the
anchorage value of hook is
A.
2d
B. 4d
C. 8d
D. 16d
Answer:
Option
D
72. Bars of diameter.... should not be
spliced but should be welded
A.
25mm
B. 32mm
C. 36mm
D. Greater
than 36mm
Answer:
Option
D
73. A beam curved in plan is designed
for
A.
BM
& Shear
B.
BM
& Torsion
C. Shear
& Torsion
D. BM,
Shear & Torsion
Answer:
Option
D
74. When shear stress 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
Answer:
Option
A
75. A beam is designed for UDL causing compression
in the supporting column. Where is the critical section for shear
A. A
distance of d/2 from the face of the support
B. A
distance d from the face of support
C. At
the centre of the support
D. At
the face of support
Answer:
Option
B
76. A continuous beam is deemed to be a
deep beam when the ratio of effective span to overall
depth (l/D) is less than
a) 1.5
b) 2.0
c) 2.5
d) 3.0
Answer:
Option
C
77. Maximum permissible free fall of
concrete has been stipulated as per IS Code
a) 1.5m
b) 2m
c) 1m
d) 2.5m
Answer:
Option
A
78. Minimum Clear cover for footings as
per IS Code
a) 30 mm
b) 40 mm
c) 50mm
d) 60mm
Answer:
Option
C
79. A foundation is called shallow if
its depth, is
a) one fourth of its depth
b) Half of its width
c) Three fourths of its width
d) Less than or equal to its
width
Answer:
Option
D
80. Maximum cement content in case of
RCC should not exceed
a) 530 kg/m3
b) 450 kg/m3
c) 300 kg/m3
d) 400 kg/m3
Answer:
Option
B
No comments:
Post a Comment