### Objective Questions And Answers for All Competitive Exams (Loksewa Sub Engineer, Overseer, Sub Overseer, Central level and Pardesh Level/Province Level)

**For Continuous Slab supporting on beam, the Ratio of end span length to Continuous span length is**

a. 0.5

b. 0.8

c. 0.7

d. 0.9

**2. Limiting value of Neutral axis (Xulim) depends upon**

a. Grade of Steel.

b. Type of steel.

c. effective depth of beam

d. All of these.

**3. The value of Creep coefficient of Concrete increases with**

a. remains same with age

b. Decrease in Age.

c. Increase in Age.

d. none of these.

**4. The maximum amount of chloride content should be available in water for reinforced cement concrete work is**

a. 2000 mg/l

b. 200 mg/l

c. 500 mg/l

d. 5000 mg/l

.

**5. For any RCC work, concrete member is subjected in tidal zone, additional cover thickness recommended by IS 456:2000 is?**

a. 40 mm.

b. 75 mm.

c. 55 mm.

d. 20 mm.

**6. Long term deflection of RCC members occurs due**

a. Shrinkage

b. creep

c. Both (a) and (b)

d. None of these.

**7. The design strength of Fe 500 grade of steel is**

a. 400 N/mm^{2}

b. 500 N/mm^{2}

c. 435 N/mm^{2}

d. 275 N/mm^{2}

**8. The Direct Tensile Strength of M 25 Grade of Concrete is**

a. 1.8

b. 3.5

c. 2

d. None of these.

**9. The Working Stress of Fe 500 grade of Steel is**

a. 275 N/mm^{2}.

b. 300 N/mm^{2}.

c. 140 N/mm^{2}.

d. 250 N/mm^{2}.

**10. In limit state method, the Maximum compressive strain at direct compression is**

a. 0.0035

b. 0.002

c. 0.003

d. None of these.

**Objective Questions And Answers for All Competitive Exams**

**Answers**

1 Ans d)

2 Ans d)

Explanation:

- Limiting value of Neutral axis (Xulimit) =0.53d ( for Fe 250).
- Limiting value of Neutral axis (Xulimit) =0.48d ( for Fe 415).
- (Xulimit) =0.46d ( for Fe500).
- Limiting value of Neutral axis (Xulimit) =0.44d ( for Fe 550).
- Here, the Limiting value of N.A. depends upon the grade of steel or type of steel and effective depth of steel.

3 Ans b)

Explanation:

- Creep Coefficient (Ө) =2.2 for 7 days.
- for 28 days, Creep Coefficient (Ө) =1.6 for 28 days.
- Creep Coefficient (Ө) =1.1 for 2 years.

4 Ans c)

Explanation:

- Maximum limit of chloride content in water = 2000 mg/l (for PCC Work).
- Maximum limit of chloride content in water = 500 mg/l (for RCC Work).

5 Ans c)

Explanation:

- As concrete Member is subjected in Tidal zone, so exposure condition = Extreme condition.
- For extreme Nominal cover = 75 mm, for mild, Nominal cover =20 mm, additional cover thickness = 75 -20
**=**55 mm.

S. No | Exposure Condition | Nominal cover (mm) |

1 | Mild | 20 |

2 | Moderate | 30 |

3 | Severe | 45 |

4 | Very Severe | 50 |

5 | Extreme | 75 |

6 Ans d)

Explanation:

- Creep means at constant stress, continuously increase in strain is called creep.
- It is Time dependent phenomenon.
- Short Term deflection occurs due to dead load, Live load and permanent attached load.
- Long term deflection occurs due to creep and shrinkage.

7 Ans c)

Explanation:

- In case of Limit state Method; Design strength of steel = 0.87 fy
- for Fe 500, fy =500 N/mm
^{2}, Design strength of steel = 0.87*500 = 435 N/mm^{2}

8 Ans d)

Explanation:

- The Direct tensile strength of Concrete = 0.35 Ѵfck. For M25, Direct Tensile Strength = 0.35 * Ѵ25 = 1.75.
- The flexural tensile strength of concrete (fcr) = 0.7Ѵfck
- The Split tensile strength of Concrete = 0.462 Ѵfck.

9 Ans a)

Explanation:

- Working Stress of any grade of Steel = fy/1.8. Where 1.8 is the Factor of safety of steel in case of working stress method.
- For Fe 500, Working stress = 500/1.8 =275 N/mm
^{2}.

10 Ans b)

Explanation:

- Maximum compressive strain in Bending Compression = 0.0035.
- Maximum compressive strain at direct Compression = 0.002.

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