1. Bhakra dam in India showed which occurrence?
a) Fault zones
b) Slickensides
c) Shear zones
d) Folds
Explanation: The embankment of the Bhakra dam in India showed occurrence of numerous shear zones in them; the site could not be changed because of other reasons; hence it was decided to treat the shear zones by extensive excavations of the shear zones and back filling with cement grouting.
2. What are faults associated with?
a) Volcanic activity
b) Precipitation
c) Earthquake
d) Folds
Explanation: Faults of any significance are always associated with earthquakes. The tectonic history of the area under consideration must be known thoroughly.
3. What is recommended to be introduced to the structures even on safe land?
a) Proper dimensioning
b) Proper planning
c) Use high quality materials
d) Factor safety
Explanation: Some factor of safety has to be introduced in the building even though the tectonic history indicates not movement of the surface or plate. It is always recommended to introduce factor of safety for high raised buildings or even buildings which are built on active seismic zones.
4. Studying tectonic history is basically like knowing ___________
a) Frequency of earthquake
b) Effects
c) Frequency, effects and magnitude
d) Cost for recuperation
Explanation: Study of tectonic history would virtually mean obtaining information about the frequency of the earthquakes as also their magnitude and effects that they have left from time to time on the rocks of the region
5. Gouge and breccia don’t create any problems during construction.
a) True
b) False
Explanation: Faulting products like gouge and breccia create additional problems; the site has to be cleared of them or taken below to the sound bedrock.
6. What is responsible for jointing of rocks?
a) Genesis
b) Forces acting on the rock
c) Genesis and various forces acting on the rock
d) Precipitation
Explanation: We may find quite a large proportion of outcrop of any of these rocks practically free from joints at some places, but at other places the same type of rock may be heavily jointed, showing cracks of greater variety. Hence it is not only genesis of the rocks which responsible for these structures but also the forces acting on them.
7. Fractures along which there has been no relative displacement is called?
a) Faults
b) Joints
c) Folds
d) Intrusions
Explanation: Joints are defined as divisional planes or fractures along which there has been no relative displacement
8. Joint is always accompanied by opening.
a) True
b) False
Explanation: Joints may be open or closed. Open joints are those in which the blocks have been separated or opened up for small distances. In closed joints, there is no such separation.
9.The open joints are gradually enlarged due to ___________
a) Rains
b) Winds
c) Weathering
d) Sunlight
Explanation: Open joints are those in which the blocks have been separated or opened up for small distances in a direction at right angles to the fracture surface. These may be gradually enlarged by weathering processes and develop fissures in the rocks.
10. The type of joint usually found is ___________
a) Open joints
b) Close joints
c) Open and close joints
d) Faulted joints
Explanation: There may be or may not be an opening up of blocks perpendicular to the joint planes. Hence the joints may be of open or close nature.