1. The process of folding which mainly causes uparching is ___________
a) Folding due to differential compression
b) Folding due to tangential shearing
c) Folding due to intrusions
d) Folding due to differential tension
Explanation: Intrusion of magma or even rock salt bodies from beneath has been found to be the cause of uparching of the overlying strata.
2.What is the cause of downward bending?
a) Differential compression
b) Differential shearing
c) Intrusions
d) Flowage folding
Explanation: Strata that are being compacted under load in a basin of sedimentation develop, with the passage of time, downward bending especially in the zones of maximum loading.
3. Which rock might undergo flowage folding?
a) Siltstone
b) Sandstone
c) Gypsum
d) Limestone
Explanation: Flowage folding is the principal process of folding in incompetent or weaker, plastic type of rocks such as clays, shales, gypsum and rock salt etc.
4. At what angle is the primary lateral compressive force said to act in tangential compression?
a) 60° to the trend of the folds
b) 90° to the trend of the folds
c) 30° to the trend of the folds
d) 45° to the trend of the folds
Explanation: In general, the primary lateral compressive force is believed to act at right angles to the trend of the folds.
5. What are the fractures along which there has been relative movement of blocks called?
a) Folds
b) Joints
c) Faults
d) Intrusions
Explanation: The definition of faults is “Those fractures along which there has been relative movement of the blocks past each other”. The entire process of development of fractures and displacement of the blocks against each other is termed as faulting.
6. What is the key word in the definition of fault?
a) Fracture
b) Movement
c) Both fracture and movement
d) Dip
Explanation: The key words in the definition are fracture and movement. The exact significance of these key words must be clearly understood.
7. For a rock structure to be called fault, fracture has to happen but movement is not necessary.
a) True
b) False
Explanation: There can be no fault if there is no fracture surface or zone and also evidence of some relative movement of the blocks against each other is a must for qualifying that fracture as a fault.
8. Faulting is a _________ process.
a) Tectonic
b) Non-tectonic
c) Both tectonic and non-tectonic
d) Precipitation
Explanation: Faulting is a major tectonic process of great geological importance. The geological history of the Earth bears innumerable events recording in the script of folding, faulting and jointing.
9. In which direction does the displacement of blocks happen?
a) Horizontal
b) Vertical
c) Inclined
d) Any direction
Explanation: The displacement of blocks created in the rock due to faulting may take place in any direction: parallel to the fault surface; in an inclined manner or even rotational.
10. What is the angle that can be made by fault plane with the horizontal?
a) Acute angle only
b) Obtuse angle only
c) Right angle
d) Any angle
Explanation: Fault planes may be vertical, horizontal or inclined at any angle with the horizontal.