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Quiz 6
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Q.1
The Young's modulus of elasticity of steel, is
150 KN/mm²
200 KN/mm²
250 KN/mm²
275 KN/mm²
Q.2
If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is
D = W (a - b)/4a²bq
D = W (a² - b²)/4a²bq
D = W (a² - b²)/8a²bq
D = W (a² - b²)/4abq
Q.3
In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength
100 kg/cm²
200 kg/cm²
300 kg/cm²
400 kg/cm²
Q.4
The angle of repose of a soil is the maximum angle which the outer face of the soil mass makes
With the horizontal
With the vertical
With the perpendicular to the inclined plane of the soil
None of these
Q.5
For a continuous floor slab supported on beams, the ratio of end span length and intermediate span length, is
0.6
0.7
0.8
0.9
Q.6
Long and short spans of a two way slab are ly and lx and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. According to Rankine Grashoff theory
(wx/wy) = (ly/lx)
(wx/wy) = (ly/lx)²
(wx/wy) = (ly/lx)⁴
None of these
Q.7
A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n?. If f
c
and f
t
are permissible compressive and tensile stresses, the moment to resistance of the beam, is
bn (f
c
/2) (d - n/3)
Atf
t
(d - n/3)
½ n₁ (1 - n₁/3) cbd²
All the above
Q.8
The load stress of a section can be reduced by
Decreasing the lever arm
Increasing the total perimeter of bars
Replacing larger bars by greater number of small bars
Replacing smaller bars by greater number of greater bars
Q.9
The horizontal portion of a step in a stairs case, is known as
Rise
Flight
Winder
Tread
Q.10
An under-reinforced section means
Steel is provided at the underside only
Steel provided is insufficient
Steel provided on one face only
Steel will yield first
Q.11
If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is
40
45
50
55
Q.12
The system in which high tensile alloy steel bars (silica manganese steel) are used as pre-stressing tendons, is known as
Freyssinet system
Magnel-Blaton system
C.C.L. standard system
Lee-McCall system
Q.13
The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or
12 bar diameters
18 bar diameters
24 bar diameters
30 bar diameters
Q.14
The maximum shear stress (qmax) in a rectangular beam is
1.25 times the average
1.50 times the average
1.75 times the average
2.0 times the average
Q.15
A pre-stressed concrete member
Is made of concrete
Is made of reinforced concrete
Is stressed after casting
Possesses internal stresses
Q.16
For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to
10
15
20
25
Q.17
A circular slab subjected to external loading, deflects to form a
Semi-hemisphere
Ellipsoid
Paraboloid
None of these
Q.18
If the maximum shear stress at the end of a simply supported R.C.C. beam of 6 m effective span is 10 kg/cm², the share stirrups are provided for a distance ‘x’ from either end where, ‘x’ is
50 cm
100 cm
150 cm
200 cm
Q.19
The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is
30°
40°
45°
All the above
Q.20
If ‘W’ is the load on a circular slab of radius ‘R’, the maximum radial moment at the centre of the slab, is
WR²/16
2WR²/16
3WR²/16
5WR²/16
Q.21
If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is
WR²/16
2WR²/16
3WR²/16
Zero
Q.22
The live load to be considered for an accessible roof, is
Nil
75 kg/m³
150 kg/m²
200 kg/cm²
Q.23
The live load to be considered for an inaccessible roof, is
Nil
75 kg/m²
150 kg/cm²
200 kg/m²
Q.24
A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is
30
35
40
45
Q.25
In a slab, the pitch of the main reinforcement should not exceed its effective depth
Three times
Four times
Five times
Two times
Q.26
If ‘A’ is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force ‘P’ through its centroidal longitudinal axis, the compressive stress in concrete, is
P/A
A/P
P/2A
2A/P
Q.27
If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is
w (R + T)/T
w √(R² + T²)/T
w √(R + T)/T
w (R/T)
Q.28
The modular ratio ‘m’ of a concrete whose permissible compressive stress is ‘C’, may be obtained from the equation.
m = 700/3C
m = 1400/3C
m = 2800/3C
m = 3500/3C
Q.29
The breadth of a ribbed slab containing two bars must be between
6 cm to 7.5 cm
8 cm to 10 cm
10 cm to 12 cm
12 cm to 15 cm
Q.30
The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm² and 250 kg/cm² respectively. If m = 15, the depth of its neutral axis is
20 cm
25 cm
30 cm
35 cm
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