Civil Engineering (CE) Exam  >  Civil Engineering (CE) Tests  >  Foundation Engineering  >  Test: Footing & Rafts - 1 - Civil Engineering (CE) MCQ

Test: Footing & Rafts - 1 - Civil Engineering (CE) MCQ


Test Description

10 Questions MCQ Test Foundation Engineering - Test: Footing & Rafts - 1

Test: Footing & Rafts - 1 for Civil Engineering (CE) 2024 is part of Foundation Engineering preparation. The Test: Footing & Rafts - 1 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Footing & Rafts - 1 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Footing & Rafts - 1 below.
Solutions of Test: Footing & Rafts - 1 questions in English are available as part of our Foundation Engineering for Civil Engineering (CE) & Test: Footing & Rafts - 1 solutions in Hindi for Foundation Engineering course. Download more important topics, notes, lectures and mock test series for Civil Engineering (CE) Exam by signing up for free. Attempt Test: Footing & Rafts - 1 | 10 questions in 30 minutes | Mock test for Civil Engineering (CE) preparation | Free important questions MCQ to study Foundation Engineering for Civil Engineering (CE) Exam | Download free PDF with solutions
1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Footing & Rafts - 1 - Question 1

In a RCC footing on soil, the minimum thickness at edge should not be less than

Detailed Solution for Test: Footing & Rafts - 1 - Question 1

As per IS 456: 2000, Clause 34.1.2,
Thickness at the Edge of Footing
In reinforced and plain concrete footings, the thickness at the edge shall be not less than 150 mm for footings on soils
For footings on piles, the thickness at the edge shall be not less than 300 mm above the tops of piles.

Test: Footing & Rafts - 1 - Question 2

The minimum thickness of braced walls as per IS 456 is

Detailed Solution for Test: Footing & Rafts - 1 - Question 2

(i) Reinforced concrete wall is designed as a compression member. The reinforced concrete wall is used in cases where beam is not provided and load from the slab is heavy or when the masonry wall thickness is restricted.
Braced and Unbraced Concrete Walls:
When cross walls are provided for the walls such that they can take lateral load and 2.5% of vertical load, then the wall is braced. Otherwise, the wall is known as unbraced wall.
Detailing of Reinforcement [IS 456 Guidelines]:

  • For plain concrete walls, the minimum vertical steel is 0.12% for HYSD bars and 0.15% for mild steel bar.
  • For RC wall, minimum vertical reinforcement is 0.4% of cross-section.
  • In plain concrete wall, transverse steel is not required
  • In RC wall, transverse steel is not required (not less than 0.4%)
  • Maximum spacing of bars is 450mm or 3t, whichever lesser
  • The thickness of wall in no case should be less than 100mm
  • If thickness is greater than 200mm, double grid reinforcement is provided along both the faces.
Test: Footing & Rafts - 1 - Question 3

In case of a isolated square concrete footing, match the location at which the stress resultant are to be checked?

Detailed Solution for Test: Footing & Rafts - 1 - Question 3

For Bending Moment:
The critical section for the bending moment is at the face of the column.

For Shear stress:
a) One Way shear
The critical section for one-way shear is at a distance d from the face of the column.

b) Two-way shear or punching shear
The critical section for two-way shear is at a distance d/2 from the face of the column.

So, the correct answer is A – 1, B – 3, C - 2.

Test: Footing & Rafts - 1 - Question 4

According to I.S. 456-1978, the thickness of reinforced concrete footing on piles at its edges is kept less than

Detailed Solution for Test: Footing & Rafts - 1 - Question 4

According to I.S. 456-1978, the thickness of reinforced concrete footing on piles at its edges is kept less than ​15 cm.
However, from the updated IS Module of 456:2000:
As per IS 456: 2000, Clause 34.1.2,
Thickness at the Edge of Footing
In reinforced and plain concrete footings, the thickness at the edge shall be not less than 150 mm for footings on soils.
For footings on piles, the thickness at the edge shall be not less than 300 mm (30 cm) above the tops of piles.

Test: Footing & Rafts - 1 - Question 5

In reinforced concrete footings, the minimum value of nominal cover for the reinforcing bar, to meet the durability requirement is:

Detailed Solution for Test: Footing & Rafts - 1 - Question 5

Specification for footing as per IS 456:2000 are as follows:
i) The thickness at the edge shall not be less than 150 mm for footings on soil and not less than 300 mm for footing on piles.
ii) The depth of the foundation should be a minimum of 500 mm.
iii) For reinforcement, the footing is treated as an inverted slab. As per IS:456-2000, the minimum percentage of reinforcement of steel is 0.12% of the gross sectional area with HYSD bar and 0.15% of the gross area with plain bars of mild steel.
iv) Minimum clear cover should be 50 mm.
v) Permissible shear stress for footing, according to limit state method is τc  = 0.25√fck and τc = 0.16√fck according to working stress method.

Test: Footing & Rafts - 1 - Question 6

The weight of the footing is assumed as ____ of the weight transferred to the column.

Detailed Solution for Test: Footing & Rafts - 1 - Question 6

Concept:
To calculate the area of foundation required for the given load, we need the weight of the foundation also, so in columns and walls, we assumed the weight of the foundation to be 10% of the column load or wall load for column and wall respectively.
Additional Information
The critical section for bending moment under different situation is given below:

  • If RCC foundation is provided for a RCC column/wall, then critical section for BM is at the face of column or wall as it behaves as cantilever bending as shown in figure:
  • If RCC foundation is provided over brick masonry wall, then critical section for BM is at middle of wall as shown in figure:

Test: Footing & Rafts - 1 - Question 7

In R.C.C. cantilever retaining wall, if the check for overturning is not satisfied, which of the following would serve the better in meeting the check? 

Detailed Solution for Test: Footing & Rafts - 1 - Question 7

Retaining wall:

  • The retaining wall is used to retain earth and resist the lateral pressure of soil at a place with a sudden change in elevation.
  • Cantilever type retaining wall is used for heights up to 6m.
  • Cantilever type retaining wall has the following components:
    • Stem
    • Toe slab
    • Heel slab 
  • The stability of a cantilever-type retaining wall against overturning can be obtained by taking moment about the toe of the retaining wall.
  • Due to backfill pressure overturning moment is generated which causes the overturning of the retaining wall about the toe of the wall.
  • Resisting moment against overturning is generated due to the:
    • Self-weight of the wall
    • Backfill over the heel slab

  • Let Mr = Resisting moment against overturning and Mo = Overturning moment
  • If Mr > MO⇒ Retaining wall is safe against overturning
  • If the Heel slab length increases, the Resisting moment also increases as more backfill over the heel slab tends to increase the resistance of the wall against overturning thus wall becomes safe against overturning.
Test: Footing & Rafts - 1 - Question 8

The height of a retaining wall is 5.5 m. It is to be designed as

Detailed Solution for Test: Footing & Rafts - 1 - Question 8

Retaining wall:

  • A retaining wall or retaining structure is used for maintaining the ground surfaces at different elevations on either side of it.
  • Whenever embankments are involved in construction, retaining walls usually necessary.

Types of retaining wall:

  • Depending upon the mechanisms used to carry the earth's pressure, These are classified into the following types.

(i) Gravity retaining wall.
(ii) Cantilever retaining wall.
(iii) Butters wall.

Gravity retaining wall:

  • It is not used for heights of more than 3.0 m.
  • In it, the resistance to the earth's pressure is generated by the weight of the structure.

Cantilever retaining wall:

  • It is the most common type of retaining wall and its height ranges up to 10-25 feet (3 to 8m).
  • Counterfort retaining walls are economical for height over about 6 m.
  • A cantilever retaining wall resists the earth pressure horizontal & another, by the cantilever bending action.
Test: Footing & Rafts - 1 - Question 9

In reinforced and plain concrete footing resting on soils, the thickness at edge shall not be less than:

Detailed Solution for Test: Footing & Rafts - 1 - Question 9

As per IS 456: 2000, Clause 34.1.2,
Thickness at the Edge of Footing
In reinforced and plain concrete footings, the thickness at the edge shall be not less than 150 mm for footings on soils. 
For footings on piles, the thickness at the edge shall be not less than 300 mm above the tops of piles.

Test: Footing & Rafts - 1 - Question 10

For a RC footing ratio of its long side to short side is 1.5. The ratio of reinforcement to be provided in the central band width to total reinforcement in the short direction shall be:

Detailed Solution for Test: Footing & Rafts - 1 - Question 10

Reinforcement that will be required in central width band is:

where,
β is the ratio of the longer side to the shorter side of the footing.
β = 3/2 = 1.5
Longer side of footing = 3 m
The shorter side of footing = 2 m

Reinforcement in central bandwidth = 0.8x.

18 videos|46 docs|27 tests
Information about Test: Footing & Rafts - 1 Page
In this test you can find the Exam questions for Test: Footing & Rafts - 1 solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Footing & Rafts - 1, EduRev gives you an ample number of Online tests for practice

Up next

18 videos|46 docs|27 tests
Download as PDF

Up next

Download the FREE EduRev App
Track your progress, build streaks, highlight & save important lessons and more!