RCC Design Test 1

Question 1
2 / -0.33

The stress at which the first flexural crack appears in M25 concrete is

A
2.5 MPa

B
3.5 MPa

C
4.5 MPa

D
25 MPa

Question 2
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An RC beam of rectangular cross-section having a width of 300 mm and an effective depth of 460 mm is provided with shear reinforcement. The maximum spacing of vertical shear stirrups is

A
345 mm

B
460 mm

C
240 mm

D
300 mm

Question 3
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Which of the following is correct regarding shrinkage strain produced in prestressed concrete?

A
Autogenous shrinkage strain develops slowly through the hardened concrete.

B
Autogenous shrinkage strain is a parabolic function of concrete strength.

C
Drying shrinkage strain is produced in the early days after casting due to hardening of concrete

D
Drying shrinkage strain depends upon the relative humidity of the environment.

Question 4
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Which of the following is correct statement regarding reinforcement in Cantilever retaining wall?

A
Main reinforcement of stem is provided at the back face of the stem

B
Main reinforcement of heel slab is at the bottomof the slab

C
Main reinforcement of toe slab is at the top of the slab

D
Minimum cover for reinforcement should be 25 mm

Question 5
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A reinforced-concrete slab with effective depth of 80 mm is simply supported at two opposite ends on 230 mm thick masonry walls. The centre-to-centre distance between the walls is 3.3 m. As per IS 456 : 2000, the effective span of the slab (in m, up to two decimal places) is ______

A
3.15-3.15

B
3.154-3.151

C
3.157-3.156

D
3.159-3.152

Question 6
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Consider the Exposure condition as "Concrete surfaces protected against weather or aggressive conditions, except those situated in coastal areas".

As per IS 456:2000, The above exposure condition will correspond to:

A
Mild Exposure

B
Moderate Exposure

C
Severe Exposure

D
Very Severe Exposure

Question 7
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Considering the limit state of flexure, what will be the ratio of maximum strain in extreme fibre in the tension reinforcement [for Fe-500 grade of steel] to that of concrete in Compression?
Take E_S = 2 × 10⁵ MPa

A
0.479

B
2.087

C
0.838

D
1.193

Question 8
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The long term elastic modulus of M 25 concrete having ultimate creep coefficient of 1.6 is ______

A
25000 MPa

B
9615.38 MPa

C
15625 MPa

D
Inadequate data

Question 9
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The minimum percentage of Fe 415 to be provided in a RC beam 300 mm × 600 mm carrying transverse load is _______ (in mm² up to 2 decimal places)

A
365-370

B
3654-3701

C
3657-3706

D
3659-3702

Question 10
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As per IS 456:2000, the diagonal tension failure in RCC beams depends upon:

A
Grade of concrete and Percentage of transverse reinforcement provided.

B
Grade of concrete and Steel only

C
Grade of steel and percentage of longitudinal reinforcement provided

D
Grade of concrete and percentage of longitudinal reinforcement provided

Question 11
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Consider the following statements with reference to IS 456:2000 provisions:
P. For bars in tension, anchorage value of bend shall be taken as four times the diameter of bar for each 45^o bend subjected to a maximum of 16 times the diameter of bar.
Q. Bars larger than 32 mm diameter shall not be bundled except in case of columns.
R. For bars in tension, the anchorage value of a standard U-type hook shall be equal to 16 times the diameter of bar.
S. When bars of two different diameters are to be spliced, the lap length shall be calculated on the basis of diameter of the smaller bar.

A
P-True, Q-False, R-False, S-True

B
P-False, Q-False, R-False, S-True

C
P-True, Q-True, R-False, S-False

D
P-True, Q-True, R-True, S-True

Question 12
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The gross bearing capacity of the soil carrying a footing is 360 kN with an internal angle of friction of 30° and a bulk unit weight of 18 kN/m³. The minimum depth of footing as per Rankine formula is

A
1.11 m

B
2.22 m

C
3.33 m

D
6.67 m

Question 13
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The main reinforcement and secondary reinforcement of RC slab (one way) consists of 20 mm bars with c/c spacing of 150 mm and 16 mm bars with c/c spacing of 200 mm respectively. If it is desired to replace the 20 mm bars by 28 mm and 16 mm bars by 20 mm, then find the ratio of percentage change in spacing of main reinforcement and secondary reinforcement. Given that effective depth of slab is 80 mm and use LSM as per IS456 : 2000.

A
0.98-1.15

B
0.984-1.151

C
0.987-1.156

D
0.989-1.152

Question 14
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A cantilever RC beam of span 6 m and rectangular cross-section 300 mm × 600 mm with an effective cover of 40 mm is made of M 25 concrete and Fe 415 steel. Which one of the following is correct? (Assume, Modification factors for \(\frac{l}{d}\;\)is k₁ = k₂ = k₃ = 1 )

A
The beam is laterally unstable and safe in deflection.

B
The beam is laterally stable and unsafe in deflection.

C
The beam is safe both in deflection and lateral stability.

D
The beam is unsafe in both the deflection and lateral stability.

Question 15
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Beam sections designed in accordance with LSM as compared to sections designed in accordance with WSM will have

A
Larger depth and smaller amount of reinforcement

B
Same depth and same reinforcement

C
Smaller depth and more reinforcement

D
Same depth as that of a deep beam

Question 16
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If a sample of M20 concrete grade, consisting of three specimens is to be tested, what should be minimum compressive strength of the third specimen, if the compressive strength of the first two specimens is 28 N/mm² and 24 N/mm² respectively?

A
27.8-27.8

B
27.84-27.81

C
27.87-27.86

D
27.89-27.82

Question 17
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Estimate the quantity of cement required per m³ of concrete under the following mix design:
Water cement ratio = 0.55
C : FA : CA = 1 : 2 : 4 (by mass)
The specific gravities are: Cement = 3.15, Fine aggregate = 2.65, Coarse aggregate = 2.6

A
316.39 kg

B
432.40 kg

C
350 kg

D
272.4 kg

Question 18
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For a square beam of size 400 × 400 mm (effective) is reinforced with 4 bar of 12 mm diameter.
The difference between the moment of resistance calculated based upon the Limit state method and Working stress method (in kNm) is ____
(M20, Fe415, Neutral axis constant = 0.4, Actual neutral axis (as per WSM) = 96.76 mm)

A
23-24

B
234-241

C
237-246

D
239-242

Question 19
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Minimum shear reinforcement in beams is provided in the form of stirrups

A
to resist extra shear force due to live load

B
to resist the effect of shrinkage of concrete

C
to resist principal tension

D
to resist shear cracks at the bottom of beam

Question 20
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Consider the following statements and Identify the correct option with regard to provisions of IS 456: 2000:

P. The minimum stripping time for props to slab spanning over 4.5 m is 7 days

Q. The minimum stripping time for props to arches spanning over 6 m is 14 days.

R. To ensure the strength of Designed concrete mix, Random sampling procedure is adopted

S. When a bar of two different diameters is to be spliced, the lap length shall be calculated on the basis of the bar of the larger diameter.

A
P – True Q – True R – True S – False

B
P – False Q – False R – True S – True

C
P – True Q – False R – False S – False

D
P – False Q – False R – True S – False

Question 21
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If after 28 days of the casting of RC beam, the creep strain is 60% more than that of Elastic strain Percentage decrease in modulus of elasticity according to IS 456 : 2000 is

A
160%

B
58%

C
60%

D
61.5%

Question 22
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A rectangular beam of width b = 250 mm, effective depth d = 350 mm is reinforced in tension with mild steel of grade Fe250, A_st = 1800 mm². The grade of concrete used is M30. The ultimate moment of resistance of the beam is ________

A
113 kN-m

B
137 kN-m

C
320 kN-m

D
432 kN-m

Question 23
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An isolated T-beam used as the walking – way is shown in the figure. The clear span is 5m and fixed at both the ends. Calculated the effective flange width of the T-beam

A
726.31 mm

B
1002.63 mm

C
1131.81 mm

D
790.90 mm

Question 24
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A doubly reinforced concrete beam with an effective cover of 50 mm to center of both tension and compression reinforcement with an effective depth of 550 mm. If the maximum permissible stress in the outermost fibres in both steel and concrete reaches at the same time, what will be the maximum strain in concrete at the level of compression reinforcement satisfying codal provisions of IS 456:2000 according to limit state method.

Take Fe 500 grade of steel for both tension and compression reinforcement and M 20 grade of concrete.

A
0.00350

B
0.00289

C
0.00284

D
0.00281

Question 25
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A simply supported beam of 300 mm wide and 500 mm deep is loaded as the shear force at support is 140 KN and throughout the beam, the SF does not exceed 70 KN. One out of six bars of 22 mm dia, Fe 415 grade is bent up at 45˚ near the support to resist the shear. Analyze the beam and choose the correct statement: -

M20 grade concrete is used with τ_c = 0.48Mpa

A
Beam is safe in shear; no need of transverse shear reinforcement.

B
No need of bent up bar.

C
Beam is to be designed for transverse shear reinforcement.

D
Section should be revised.

Submit Test

RCC Design Test...

Question 1

2.5 MPa

3.5 MPa

4.5 MPa

25 MPa

Question 2

345 mm

460 mm

240 mm

300 mm

Question 3

Autogenous shrinkage strain develops slowly through the hardened concrete.

Autogenous shrinkage strain is a parabolic function of concrete strength.

Drying shrinkage strain is produced in the early days after casting due to hardening of concrete

Drying shrinkage strain depends upon the relative humidity of the environment.

Question 4

Main reinforcement of stem is provided at the back face of the stem

Main reinforcement of heel slab is at the bottomof the slab

Main reinforcement of toe slab is at the top of the slab

Minimum cover for reinforcement should be 25 mm

Question 5

3.15-3.15

3.154-3.151

3.157-3.156

3.159-3.152

Question 6

Mild Exposure

Moderate Exposure

Severe Exposure

Very Severe Exposure

Question 7

0.479

2.087

0.838

1.193

Question 8

25000 MPa

9615.38 MPa

15625 MPa

Inadequate data

Question 9

365-370

3654-3701

3657-3706

3659-3702

Question 10

Grade of concrete and Percentage of transverse reinforcement provided.

Grade of concrete and Steel only

Grade of steel and percentage of longitudinal reinforcement provided

Grade of concrete and percentage of longitudinal reinforcement provided

Question 11

P-True, Q-False, R-False, S-True

P-False, Q-False, R-False, S-True

P-True, Q-True, R-False, S-False

P-True, Q-True, R-True, S-True

Question 12

1.11 m

2.22 m

3.33 m

6.67 m

Question 13

0.98-1.15

0.984-1.151

0.987-1.156

0.989-1.152

Question 14

The beam is laterally unstable and safe in deflection.

The beam is laterally stable and unsafe in deflection.

The beam is safe both in deflection and lateral stability.

The beam is unsafe in both the deflection and lateral stability.

Question 15

Larger depth and smaller amount of reinforcement

Same depth and same reinforcement

Smaller depth and more reinforcement

Same depth as that of a deep beam

Question 16

27.8-27.8

27.84-27.81

27.87-27.86