1. Most common angle of normal faults is ___________
a) 30° to 45°
b) 45° to vertical
c) 60° to horizontal
d) 0° to 180°
Explanation: In normal faults, the fault plane may be inclines at any angle between horizontal and vertical, but most commonly, the fault angles are between 45° and vertical.
2. What is the other name for normal faults?
a) Uniform faults
b) Hade faults
c) Similar faults
d) Gravity faults
Explanation: Normal faults are also often termed as gravity faults especially when it is established that the hanging wall has actually moved down with respect to the foot wall.
3. Alps in an example of which type of fault?
a) Graben
b) Horst
c) Hinge fault
d) Vertical fault
Explanation: Numerous small and big examples of horsts are found in major mountain systems such as Alps, Central Europe and East Africa.
4. Horst and graben are physiographic features of which type of faults?
a) Normal faults
b) Reverse faults
c) Thrust faults
d) Strike-slip faults
Explanation: Horst and graben are the physiographic features caused by normal faults occurring in pairs.
5. The type of fault which appears in such a way that the central wedge appears raised high up with respect to the sides is ___________
a) Graben
b) Horst
c) Nappe
d) Thrust
Explanation: When two normal faults appear on either side of a central wedge shaped elongated block in such a way that the central wedge appears raised high up with respect to the sides, the outstanding structure is called a horst.
6. Block mountains are caused by which type of faults?
a) Horst
b) Graben
c) Thrust
d) Nappes
Explanation: Sometimes the horsts may be high and extensive enough to be called a Block mountain. In many horsts, the border faults are almost parallel in strike and very high angled.
7. Which fault is the reverse of horst?
a) Reverse fault
b) Radial fault
c) Graben
d) Hinge fault
Explanation: Graben is almost the reverse of a horst in structure and appearance. A graben may be described as an elongated wedge shaped central block, which appears to have moved downward with respect to the side blocks along two downward converging normal faults.
8. The phenomenon not associated with imbricate structures is ___________
a) Series of thrust blocks occur in close proximity
b) Thrust blocks are piled up one above another
c) All fault surfaces dip in the same direction
d) Thrust blocks aren’t piled up one above another
Explanation: When a series of thrust faults occur in close proximity, thrust blocks are piled up one above another and all the fault surfaces dip in same direction. The resulting interesting structure is known as an imbricate structure.
9. In the Himalayan Mountains, many well defined nappe zones have been recognized.
a) True
b) False
Explanation: In the Himalayan Mountains, many well defined nappe zones have been recognized among which may be mentioned the Kashmir Nappe, the Nappe zone of Shimla Himalayas and the Nappes of the Garhwal Himalayas.
10. Most common term used for strike-slip faults is ___________
a) Slip fault
b) Transform fault
c) Tranlational fault
d) Hinge fault
Explanation: There are some other terms used for strike slip faults such as lateral faults, transverse faults, wrench faults and transform faults. Of these, the transform faults are very common and denote strike slip faults specially developed in oceanic ridges