RCC Design Test 1

Question 1
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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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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 6
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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 7
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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 8
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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 9
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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 10
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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 11
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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 12
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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 13
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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 14
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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

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

0.479

2.087

0.838

1.193

Question 6

25000 MPa

9615.38 MPa

15625 MPa

Inadequate data

Question 7

365-370

3654-3701

3657-3706

3659-3702

Question 8

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 9

1.11 m

2.22 m

3.33 m

6.67 m

Question 10

0.98-1.15

0.984-1.151

0.987-1.156

0.989-1.152

Question 11

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 12

27.8-27.8

27.84-27.81

27.87-27.86

27.89-27.82

Question 13

316.39 kg

432.40 kg

350 kg

272.4 kg

Question 14

23-24

234-241

237-246

239-242

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