Black cotton soil is unsuitable for foundations because

Of its property to undergo a volumetric change due to variation of moisture content

Assertion (A): Black cotton soils are clay and exhibit characteristic property of swelling.Reason (R): These clays contain Montmorillonite which attracts external water into its lattice structure.

Both A and R are true and R is not the correct explanation of A

Both A and R are true and R is the correct explanation of A

A layer of boulders and pebbles in a sequence of rocks

A surface of erosion or non-deposition as detected in a sequence of rocks

A layer of boulders and pebbles in a sequence of rocks

A layer of clay or shale in an igneous mass

A type of joint especially associated with folded and faulted rocks

Both A and R are true and R is not the correct explanation of A

Both A and R are true and R is the correct explanation of A

1.	Black cotton soil is unsuitable for foundations because
A.	Its permeability is uncertain
B.	Its bearing capacity is low
C.	Its particles are cohesive
D.	Of its property to undergo a volumetric change due to variation of moisture content
Answer» E.

2.	Cleavage is a mode of folding:1. It is a process wherein all internal movements are along shear planes which do not change their position during the entire process.2. It is a process wherein all internal movements are along shear planes which change their position during the process.3. The process involves dilation in the vertical direction.4. The process involves compression in a lateral direction.Which of the above statements are correct?
A.	1, 2 and 3 only
B.	1, 3 and 4 only
C.	1, 2 and 4 only
D.	2, 3 and 4 only
Answer» E.

4.	Assertion (A): Black cotton soils are clay and exhibit characteristic property of swelling.Reason (R): These clays contain Montmorillonite which attracts external water into its lattice structure.
A.	Both A and R are true and R is not the correct explanation of A
B.	Both A and R are true and R is the correct explanation of A
C.	A is false but R is true
D.	A is true but R is false
Answer» C. A is false but R is true

5.	Plastic characteristics of clays are due to
A.	Adsorbed water
B.	Free water
C.	Capillary water
D.	Excessive water
Answer» B. Free water

6.	An unconformity is
A.	A surface of erosion or non-deposition as detected in a sequence of rocks
B.	A layer of boulders and pebbles in a sequence of rocks
C.	A layer of clay or shale in an igneous mass
D.	A type of joint especially associated with folded and faulted rocks
Answer» B. A layer of boulders and pebbles in a sequence of rocks

7.	A clay which contains Kaolinite has an activity value of: _____.
A.	1
B.	0
C.	0.4
D.	0.8
Answer» D. 0.8

8.	Consider the following statements regarding ecology:1. Climax ecosystem is a stage in the evolution of an ecosystem, at which all the species are in dynamic equilibrium among themselves as also with the environment.2. Ecological niche means all the physical, chemical and biological factors that a species needs in order to live and reproduce exist.3. Edge effect refers to the presence of rich and unique biological diversity found in an ecotone.Which of the above statements are correct?
A.	1, 2 and 3
B.	1 and 2 only
C.	1 and 3 only
D.	2 and 3 only
Answer» B. 1 and 2 only

9.	Assertion (A): Road built on black cotton soils shows crack after sometime.Reason (R): Black cotton soils settle and this results in deformation.
A.	Both A and R are true and R is not the correct explanation of A
B.	Both A and R are true and R is the correct explanation of A
C.	A is false but R is true
D.	A is true but R is false
Answer» C. A is false but R is true

10.	Bentonite clay is an example for
A.	Kaolinite
B.	Montmorillonite
C.	Vermiculite
D.	Illite
Answer» C. Vermiculite

11.	Increase in capillary rise of water in soils depends upon: _____.i. Void ratioii. Grain sizeThe correct amongst these is/are:
A.	Only i
B.	Only ii
C.	Both i and ii
D.	Neither i nor ii
Answer» D. Neither i nor ii