Effect of Shape and Cohesion

Q. The contact pressure distribution under a rigid footing on a cohesionless soil would be

1. Uniform throughout
2. zero at centre and maximum at edges
3. zero at edges and maximum at centre
4. maximum at edges and minimum at centre

Q. The net ultimate bearing capacity of a purely cohesive soil

1. depends on the width of the footing and is independent of the depth of the footing
2. depends on the width as well as the depth of the footing
3. depends on the depth, but is independent of the width, of the footing
4. is independent of both the width and the depth of the footing

Q. Influence factor for immediate settlement of footing depends on its

1. size and shape
2. rigidity alone
3. location and size
4. size, shape, rigidity and location

Q. Match List - I (Contact pressure distribution diagrams ) with List - II (Description of footings) and select the correct answer using the codes given below the lists :

List - I







List -II
1. Rigid footing on cohesive soil
2. Flexible footing on chohesive soil
3. Rigid footing on cohesionless soil at ground level
4. Flexible footing on cohesionless soil at ground level.

Codes :


A B C D

1. 3 1 4 2
2. 4 2 3 1
3. 3 2 4 1
4. 4 1 3 2

Q. A strip footing is resting on the ground surface of a pure clay bed having an undrained cohesion $C_u$. The ultimate bearing capacity of the footing is equal to

1. 
   $$2\pi c_u$$
2. 
   $$\pi c_u$$
3. 
   $$(\pi +1)c_u$$
4. 
   $$(\pi +2)c_u$$

Q. If two foundations, one narrow and another wide, are resting on a bed of sand carrying the same intensity of load per unit area, then which one is likely to fail early ?

1. Narrow foundation
2. Wider foundation
3. Both will fail simultaneously
4. Difficult to judge since other conditions are unknown

Q. Two circular footings of diameters D and 3D are resting on the surface of same purely cohesive soil. The ratio of their ultimate bearing capacity is

1. 1
2. 9
3. 1/3
4. 3

Q. Consider the following statements: Criteria for satisfactory performance of footings are that the
1. soil supporting the footing must be safe against shear failure
2. footing must not settle more than a pre specified value
3. footing must be rigid
4. footing should be above water table.
Which of these statements are correct?

1. 3 and 4
2. 1 and 2
3. 1 and 3
4. 2 and 4

Q. Consider the following statements:
For a rigid footing placed at the ground surface on sand, the contact pressure
1. is maximum at the edges.
2. is zero at the edges.
3. distribution is parabolic.
4. is uniform throughout the base of the footing.
Which of the above statements are correct?

1. 1 and 3 only
2. 1 and 4 only
3. 2 and 3 only
4. 2 and 4 only