Raft foundation are generally preferred to when the area required for individual footing, is more than
25% to total area
30% of total area
40% to total area
50% of total area
Correct Answer :
D. 50% of total area
Related Questions
Pick up the incorrect statement from the following:
The function of foundation is to distribute the load of super structure over a large bearing area
No timbering is required for shallow trenches
Shallow foundations can be constructed on made-up soil
Black cotton soil is very good for foundation bed
The depth of the ground water table may be ascertained by
Looking through the well in the vicinity
Standing on the well in the vicinity
Measuring the depth of water in the well
None of the above
The maximum number of steps in a flight should generally be restricted to
10
12
15
No limit
A wooden block hinged on post outside a door, is known
Cleat
Stop
Horn
None of these
Pick up the correct statement from the following:
Louvered door is generally provided in bath rooms
Flush door is generally provided in dining room
Revolving door is generally provided in cinema halls
Sliding door is generally provided in show rooms
The function of cleats in a roof truss is
To support the common rafter
To support purlins
To prevent the purlins from tilting
All of the above
Pick up the correct statement from the following:
The cost of square rooms is less
The expenditure on the foundation and roof for the double storeyed building is nearly half of that for the ground storeyed building
The cost of construction of a house may be minimised by restricting the height floors
All the above
The radial splits which are wider on the outside of the log and narrower towards the pith are known as
Heart shakes
Cupshakes
Starshakes
Rindgalls
The pile which supports the load partly by friction and partly by resting on hard stratum, is called
Friction pile
Bearing pile
Friction bearing pile
Rough pile
Pick up the incorrect statement from the following:
The width of the wall is constructed thicker at the base in a stepped fashion
A long vertical load transferring concrete structure is called a concrete pile
In pile which transfers the load to the soil by the friction between the pile and the surrounding soil is called friction pile
The pile which transfers the load to a hard rock bed at certain depth is called load bearing
Number of vertical joints in a stretcher course is x times the number of joints in the header course, where x is equal to
1/2
1
2
1/4
If a is the offset of concrete bed in cms, and d is the depth of concrete bed in cms, then
d = 0.445 a
d = 0.557 a
d = 0.775 a
None of these
The line of intersection of two surfaces of a sloping roof forming an internal angle less than 180°, is known as
Ridge
Hip
Valley
None of these
Expansion joints in masonry walls are provided if length exceeds
10 m
20 m
30 m
40 m
To ensure that supporting area of an offset footing of a boundary wall is fully compressive, the C.G. of load must act
At the centre of the base
Within the middle third of the base
Within the middle fifth of the base
Neither (a), (b) nor (c)
In grillage foundations, distance between flanges of grillage beams, is kept
40 cm
Equal to flange width
Twice the flange width
Maximum of (a), (b) and (c)
The type of pile which is driven at an inclination to resist inclined forces is known as
Friction pile
Sheet pile
Batter pile
Anchor pile
Assertion A : Shishum is used for decorative woodwork. Reason R : Shishum can be polished to an excellent finish. Select your answer according to the coding system given below:
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
The depth of concrete bed of the foundation depends upon
The projection of the concrete block beyond the footing over it
The upward soil pressure
The mix of the concrete
All the above
According to Rankine's formula, minimum depth of foundations, is
(P/w) × [(1 + sin φ)/(1 - sin φ)]²
(P/w) × [(1 - sin φ)/(1 + sin φ)]²
(P/2w) × [(1 - sin φ)/(1 + sin φ)]²
(P/w) × [(1 + sin φ)/(1 - sin φ)]
The art of bringing the floor to a true level surface by means of screeds, is called
Topping
Bedding
Screeding
None of these
A stair should not have pitch more than
25°
30°
40°
50°
The brick laid with its length parallel to the face of a wall, is a known as
Header
Stretcher
Closer
None of these
Crown is located at
Highest point on the extrados of the arch
Highest point on the intrados of the arch
Skew-back of the arch
None of these
Single Flemish bond consists of
Double Flemish bond facing and English bond backing in each course
English bond facing and double Flemish bond backing in each course
Stretcher bond facing and double Flemish bond backing in each course
Double Flemish bond facing and header bond backing in each course
As compared to English bond, double Flemish bond is
Stronger
More compact
Costly
None of the above
The maximum total settlement for raft foundation on clayey soils should be limited to
25 mm
25 to 40 mm
40 to 65 mm
65 to 100 mm
Pile foundations are suitable for
Water logged soils
Soft rocks
Compact soils
Multi-storeyed buildings
A roof which slopes in four directions, is called
Shed roof
Gable end roof
Hipped roof
Gambrel roof
In clay soil
Swelling and shrinkage characteristics prevail
Consolidation continues even after several years of construction
Differential settlement is generally prevalent
All the above