1. The important physiographic evidence studied is ___________
a) Aligned spring
b) Offset stream
c) Mountain range
d) Offset stream and aligned spring
Explanation: Some physiographic features may serve as indirect evidence of faults. Among them, the most important are: aligned springs and offset streams
2. The resistance to stresses of rocks depend upon ___________
a) Cohesive strength only
b) Internal friction only
c) Cohesive strength and internal friction
d) Hardness
Explanation: Any rock on or below the crust may withstand all the operating stresses up to a limit, which depends upon its cohesive strength and internal friction.
3. When are the normal stresses formed?
a) Maximum stress is horizontal
b) Maximum stress is vertical
c) Maximum stress is inclined at certain angle other than right angle
d) Intermediate stress is vertical
Explanation: In highly oversimplified situation, the type of fault likely to form is related to stress field operating in a given area. Thus, talking in terms of the three principal stresses, normal faults would form when, the maximum stress is vertical.
4. What is the assumed nature of the rock for the study?
a) Isotropic
b) Anisotropic
c) Uniform
d) Non-uniform
Explanation: In all the idealized situations, it is assumed that the rocks are isotropic in character and the Mohr-Coulomb Law of rock failure holds good in those cases.
5. What is the cause for compressive force?
a) Vertical tension
b) Horizontal tension
c) Vertical compression
d) Shear
Explanation: Gravity or normal faults are believed to be caused under the influence of horizontal tension whereas thrust faults are the result of compressive forces that may throw the rocks into severe type of folding before actual development of faults.
6. A fracture is formed perpendicular to the axis plane of a fold.
a) False
b) True
Explanation: A fracture is formed parallel to the axis plane of a fold where the shearing strength of the beds is overcome by the shearing stresses responsible for the development of the fold.
7. What kind of joints do the faulted rocks form?
a) Strong
b) Weak
c) Doesn’t change
d) Extended
Explanation: The faulted rocks will form weak foundations and abutments for dam, despite the fact that originally they might have been strong and impervious.
8. When do the faulted and shear zones become potential areas of further slip and slides?
a) Dry
b) Lubricated
c) Weathered
d) Heavy winds
Explanation: Once the fault zones, shear zones or fault surfaces become lubricated with water, they become potential areas for further slips and slides. They may create critical conditions.
9. Where should a site for a civil engineering project be located?
a) On faulted zone
b) On a folded strata
c) On a joint
d) Must be avoided to possible extent to be built on all three
Explanation: As far as possible the location of a civil engineering project must be avoided on a fault or a fold or a joint. But when there is no other choice, the same location can be treated with necessary methods and then the project can be implemented.
10. What is not considered about the shear zones?
a) Number
b) Size
c) Inclination
d) Appearance
Explanation: The number, size and inclination of the shear zones should be given top consideration.