This set of Engineering Geology Quiz focuses on “Classification of Joints – 02”.
1. Joints running parallel to hinge lines are called
a) Hinge joints
b) Radial joints
c) Bedding joints
d) Oblique joints
Explanation: In the folded regions, joint orientation is conveniently described with reference to the hinge of the fold. Joints running parallel to hinge line are called radial joints.
2. In which rock, joints may be classified on the basis of their lineation?
d) Igneous and metamorphic
Explanation: In igneous and metamorphic rocks, the joints may be classified on the basis of their geometric relations with planar structures of those rocks such as lineation or cleavage.
3. Joints traverse linear structure right angles in which type?
a) Q joints
b) S joints
c) B joints
d) T joints
Explanation: Cross or Q joints are the joints which are traversing the linear structures at right angles.
4. Which are the joints parallel to linear structure?
a) Cross joints
b) Longitudinal joints
c) Alternate joints
d) Q joints
Explanation: Longitudinal or S joints, are the joints traversing parallel to the linear structure. In these rocks all the joint systems traversing at any other angular inclination with the linear structures are described as diagonal joints.
5. The joints developed due to tensile forces are
a) Tensile joints
b) Compressive joints
c) Shear joints
d) No particular name
Explanation: Tension joints are those, which have developed due to the tensile forces acting on the rocks. The most common location of such joints in folded sequence is on the outer margins of crests and troughs.
6. The type of joint occurring in igneous rocks during cooling is
a) Shear joints
b) Tensile joints
c) Compression joints
d) Bend joints
Explanation: Tension joints are also produced in igneous rocks during their cooling. Joints produced in many rocks during the weathering of overlying strata and subsequent release of stresses by expansion are also thought to be due to the tensile forces.
7. Which joints are located in axial regions in the folded rocks?
a) Tension joints
b) Compression joints
c) Shear joints
d) T joints
Explanation: Shear joints are commonly observed in the vicinity of fault planes and shear zone where the relationship with shearing forces is clearly established. In folded rocks, these are located in axial regions.
8. The joints that are caused due to compressive forces are called as
a) T joints
b) C joints
c) Longitudinal joints
d) Compression joints
Explanation: Rocks may be compressed to crushing and numerous joints may result due to the compressive forces in this case.
9. Compression joints usually occur in which part of fault?
Explanation: In the core regions of folds where compressive forces are dominant, joints may be related to the compressive forces.
10. Joints are not common and are very easy structures to study in rocks. State true or false.
Explanation: Joints are very common and at the same time very complex structures in rocks.
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