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21.

The raft foundations are generally used when the required area of footing is

A.	more than one-fourth	B.	less than one-fourth
C.	more than one-helf	D.	less than one-half

22.

When two or more footings are connected by a beam, it is called

A.	beam footing	B.	combined footing
C.	strap footing	D.	mat footing

23.

A foundation consisting of thick reinforced concrete slab covering the entire area of the bottom of the structure, is known as

A.	pile foundation	B.	pier foundation
C.	raft foundation	D.	machine foundation

24.

A raft foundation is also known as mat foundation

Correct

Incorrect

25.

A black cotton soil is unsuitable for foundations because it

A.	undergoes volumetric changes with the change of atmospheric conditions	B.	swells excessively when wet
C.	shrinks excessively when dry	D.	all of the above

26.

For providing safe and economical foundation in black cotton soil, the under-reamed piles are commonly recommended.

Yes

27.

When a veavy structure is to be constructed in sandy soil, the foundation used is

A.	pier foundation	B.	strap foundation
C.	raft foundation	D.	any one of these

28.

Pile foundation is generally used when the soil is

A.	compressible	B.	water-logged
C.	made-up type	D.	all of these

29.

The type of foundation most suitable for brideges is

A.	pier foundation	B.	raft foundation
C.	pile foundation	D.	strap foundation

30.

A combined footing is commonly used

A.	when two columns are spaced close to each other	B.	when two columns are spaced far apart
C.	under a set of columns	D.	under a set of walls