Practice Concrete Technology And Design Of Concrete Structures Multiple Choice Questions Quiz-4 - MCQGeeks.com

Q.1

If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

0.35 d
0.40 d
0.45 d
dependent on grade of concrete also

Q.2

Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is

28 liters
30 liters
32 liters
34 liters

Q.3

The recommended value of modular ratio for reinforced brick work is

18
30
40
58

Q.4

The permissible diagonal tensile stress in reinforced brick work is

about 0.1 N/mm²
zero
0.3 N/mm² to 0.7 N/mm²
about 1.0 N/mm²

Q.5

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

front face only
inner face only
both front face and inner face
none of the above

Q.6

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

increased by 10% for bars in compression
increased by 25% for bars in compression
decreased by 10% for bars in compression
decreased by 25% for bars in compression

Q.7

If the foundations of all the columns of a structure are designed on the total live and dead load basis, then

there will be no settlement of columns
there will be no differential settlement
the settlement of exterior columns will be more than interior columns
the settlement of interior columns will be more than exterior columns

Q.8

If the size of panel in a flat slab is 6m x 6m, then as per Indian Standard Code, the widths of column strip and middle strip are

3.0 m and 1.5 m
1.5 m and 3.0 m
3.0 m and 3.0 m
1.5 m and 1.5 m

Q.9

According to Whitney’s theory, ultimate strain of concrete is assumed to be

0.03%
0.1%
0.3%
3%

Q.10

The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than

0.15
0.12
0.30
1.00

Q.11

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

1.5
2.0
2.5
3.0

Q.12

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

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

Q.13

A higher modular ratio shows

higher compressive strength of con-crete
lower compressive strength of concrete
higher tensile strength of steel
lower tensile strength of steel

Q.14

Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than

35 MPa and 42 MPa
42 MPa and 35 MPa
42 MPa and 53 MPa
53 MPa and 42 MPa

Q.15

The individual variation between test strength of sample should not be more than

±5% of average
± 10% of average
± 15% of average
±20% of average

Q.16

Poisson’s ratio for concrete

remains constant
increases with richer mixes
decreases with richer mixes
none of the above

Q.17

The effect of creep on modular ratio is

to decrease it
to increase it
either to decrease or to increase it
to keep it unchanged

Q.18

In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

100 mm
150 mm
200 mm
250 mm

Q.19

The minimum cover to the ties or spirals should not be less than

15 mm
20 mm
25 mm
50mm

Q.20

When shear stress exceeds the permissible limit in a slab, then it is reduced by

Increasing the depth
Providing shear reinforcement
Using high strength steel
Using thinner bars but more in number

Q.21

For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be

600 mm
750 mm
900 mm
more than 1 m

Q.22

In a spherical dome the hoop stress due to a concentrated load at crown is

compressive everywhere
tensile everywhere
partly compressive and partly tensile
zero

Q.23

Maximum percentage reinforcement in case of slabs is limited to

2
4
6
8

Q.24

Workability of concrete is inversely proportional to

time of transit
vater-cement ratio
the air in the mix
size of aggregate

Q.25

For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine’s theory

is always less than 1
is always greater than 1
can be more than 1
can be less than 1

Q.26

To determine the modulus of rupture, the size of test specimen used is

150 x150 x500 mm
100 x100 x700 mm
150 x150 x700 mm
100 x100 x500 mm

Q.27

If a beam fails in bond, then its bond strength can be increased most economi-cally by

increasing the depth of beam
using thinner bars but more in number
using thicker bars but less in number
providing vertical stirrups

Q.28

In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

compressive and tensile
tensile and compressive
both compressive
both tensile

Q.29

Critical section for shear in case of flat slabs is at a distance of

effective depth of slab from periphery of column/drop panel
d/2 from periphery of column/capital/ drop panel
at the drop panel of slab
at the periphery of column

Q.30

If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section

depends on as, only
depends on aCbC only
depends on both crst and acbc
is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.

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