GATE - ALL Fold Related Questions
2019
Q.7 The plunge of the normal to the axial planes of vertical and upright folds is_______.
(A) 0o
(B) 45o
(C) 60o
(D) 90o
2018
Q.17 A ‘gentle’ fold with an interlimb angle equal to 160o appears tight (apparent interlimb angle equal to 20o) in horizontal section. According to the plunge of the fold axis, it can also be classified as
(A) horizontal fold. (C) steeply plunging fold.
(B) gently plunging fold. (D) vertical fold.
Q.46 The stretching lineation on the axial plane (S2) of a reclined fold on the S1 foliation makes an angle of 30o with the S1/S2 intersection lineation. The rake of the stretching lineation on the axial plane in degrees is ______________.
2017
Q.31 A limb of a non-plunging fold With an attitude 070o 40°S is rotated about its fold. axis 30o
clockwise (looking towards ENE). The plunge ammount of the pole to the fold limb after rottation is:
________degres.
2016
Q.22 Two vertically dipping limbs of a fold have perpendicular strikes. The fold can be classified as ___________ .
(A) an antiformal fold (C) a vertical fold
(B) a synformal fold (D) a recumbent fold
Q.35 In a zone of superposed folding, poles to bedding show a great circle distribution. For such a case, the fold axes related to the first generation of folding will
(A) also be distributed along the same great circle girdle.
(B) be distributed on a great circle girdle orthogonal to the bedding plane girdle.
(C) show a cluster around the pole to the
bedding plane girdle.
(D) show a small circle distribution around the pole to the bedding plane girdle
Q.54 Out of the following symmetry elements, which one is present in all classes of the cubic system?
(A) Four axes of 3-fold symmetry
(C) Six axes of 2-fold symmetry
(B) Three axes of 4-fold symmetry
(D) Three mirror planes
2015
Q.39 Interlimb angle and shape of a fold is best studied in a
(A) section parallel to the plunge of the fold axis (B) section parallel to the axial plane of the fold (C) section parallel to dip of bedding in the fold (D) section whose pole is the fold
axis
Q.40 The cross-section below shows a thrust fault with an associated fault-related fold. For the hanging wall, which one of the combinations of (P), (Q) and (R) is correct?
(A) Ramp (P), Flat (Q), Fault Bend Fold (R) (B) Ramp (P), Flat (Q), Fault Propagation Fold (R) (C) Flat (P), Ramp (Q), Fault Bend Fold (R) (D) Flat (P), Ramp (Q), Fault Propagation Fold(R)
Q.51 In the folded and faulted sequence of beds given in the map below, the fault F-F (dipping 30°NE) is which type of fault?
(A) sinistral strike-slip (C) normal
(B) reverse (D) dextral strike-slip
2014
Q.30 In a metamorphic terrain, crenulations at the hinge zone of a fold along with the development of axial plane foliation is an evidence of
(A) one phase of deformation (C) no deformation
(B) at least two phases of deformation (D) extensional regime of the deformation
2013
Q.44 The outcrop pattern of folded sedimentary strata on the map given below represents
(A) culmination of antiform (C) depression of antiform
(B) culmination of synform (D) depression of synform
2012
Q.32 In which of the following crystal systems, the characteristic symmetry elements “a two-fold axis of rotation and at least two planes of symmetry” are possible?
(A) Tetragonal (C) Orthorhombic
(B) Hexagonal (D) Monoclinic
Q.43 Which of the following statements is true?
(A) Transposition foliation is an indication of superposed folding
(B) Stratigraphic information is retained in transposition structures
(C) Transposition foliation develops parallel to
axial plane of tight folds
(D) Fold closures can be well identified in transposition structures
Q.47 Study the map below showing elevation of selected locations and outcrops of sedimentary beds.
Which of the following statements is correct?
(A) The beds dip easterly
(C) The beds dip southerly
(B) The beds dip westerly
(D) The beds are folded
2011
Q.11
The surface of discontinuity between older folded sedimentary strata and younger horizontal strata is known as
(A) disconformity (C) angular unconformity
(B) parallel unconformity (D) nonconformity
Common Data for Questions 48 and 49:
The figure below is the schematic geological map of a flat terrane.
Q.48 The strata P, Q and R have been folded into a (A) north-plunging anticlinal antiform
(C) north-plunging synclinal antiform
(B) south-plunging anticlinal antiform
(D) south-plunging synclinal antiform
Q.49 The granite pluton intruded
(A) before folding and faulting
(B) before faulting but after folding
(C) after development of unconformity but before faulting
(D) after development of unconformity and faulting
2010
Q.5 Outer-crop pattern parallel to topographic contours signifies
[A] horizontal beds
{C} inclined beds
{E} vertical beds
{D} folded beds
Common Data for Questions 48 and 49:
The following geological map exposes three beds, of which the bed P is the oldest and the bed R the youngest
Q48
What type of structure does the map depict?
{A} Faulted anticline
{C} Faultod syncline
{B} Folded strike-slip fault
{D} Folded normal fault
Q.49 Why is bed P wider in Ute area south of fault?
{A} Erosion has removed most of bed P to the north of fault
{B} Folding has caused thinning of bed P to the north of fault
{C} Deeper level of bed P is exposed due to faulting and erosion to the south of fault
{D} Bed P had a variable thickness prior to faulting
Common Data for Questions 71, 72 and 73: The following geologiCal map shows exposures of sedimentary beds p, q, r, s, t and a batholith (hatched) in .a flat terrain.
Q.7l The fold seen in the area is
(A) a synforrn plunging northerly
(C) an antifonn plunging northerly
(B) a synforrn plunging southerly
(D) an antiform plunging southerly
Q.72 If the fault dips 70° southerly, it is a
(A) normal fault with southern upthrown block
(B) right lateral strike-slip fault
(C) reverse fault with northern upthrown block
(D) reverse fault with southern upthrown block
Q.73 The intrusion of dyke took place
(A) after deposition of beds ‘s' and ‘t’
(B) before deposition of beds ‘s’ and ‘t’
(C) before faulting
(D) before folding
2007
Q.1 The maximum curvature of a cylindrically folded surface occurs at the
(A) axial plane
(B) fold axis
(C) hinge
(D) limb
Q.21
An open fold may appear to be isoclinal when viewed in a section
(A) at a low angle to the fold axis
(C) perpendicular to the fold axis
(B) at 45° to the fold axis
(D) parallel to the axial plane
2018
Q.17 A ‘gentle’ fold with an interlimb angle equal to 160o appears tight (apparent interlimb angle equal to 20o) in horizontal section. According to the plunge of the fold
axis, it can also be classified as
(A) horizontal fold.
(C) steeply plunging fold.
(B) gently plunging fold.
(D) vertical fold.
Q.46 The stretching lineation on the axial plane (S2) of a reclined fold on the S1 foliation makes an angle of 30o with the S1/S2 intersection lineation. The rake of the stretching lineation on
the axial plane in degrees is ______________.
2017
Q.31 A limb of a non-plunging fold With an attitude 070o 40°S is rotated about its fold. axis 30o
clockwise (looking towards ENE). The plunge ammount of the pole to the fold limb after rottation is:
________degres.
2016
Q.22 Two vertically dipping limbs of a fold have perpendicular strikes. The fold can be classified as ___________ .
(A) an antiformal fold (C) a vertical fold
(B) a synformal fold (D) a recumbent fold
Q.35 In a zone of superposed folding, poles to bedding show a great circle distribution. For such a case, the fold axes related to the first generation of folding will
(A) also be distributed along the same great circle girdle.
(B) be distributed on a great circle girdle orthogonal to the bedding plane girdle.
(C) show a cluster around the pole to the bedding plane girdle.
(D) show a small circle distribution around the pole to the bedding plane girdle
Q.54 Out of the following symmetry elements, which one is present in all classes of the cubic system?
(A) Four axes of 3-fold symmetry
(C) Six axes of 2-fold symmetry
(B) Three axes of 4-fold symmetry
(D) Three mirror planes
2015
Q.39 Interlimb angle and shape of a fold is best studied in a
(A) section parallel to the plunge of the fold axis
(B) section parallel to the axial plane of the fold
(C) section parallel to dip of bedding in the fold
(D) section whose pole is the fold axis
Q.40 The cross-section below shows a thrust fault with an associated fault-related fold. For the hanging wall, which one of the combinations of (P), (Q) and (R) is correct?
(A) Ramp (P), Flat (Q), Fault Bend Fold (R) (B) Ramp (P), Flat (Q), Fault Propagation Fold (R) (C) Flat (P), Ramp (Q), Fault Bend Fold (R) (D) Flat (P), Ramp (Q), Fault Propagation Fold(R)
Q.51 In the folded and faulted sequence of beds given in the map below, the fault F-F (dipping 30°NE) is which type of fault?
(A) sinistral strike-slip (C) normal
(B) reverse (D) dextral strike-slip
2014
Q.30 In a metamorphic terrain, crenulations at the hinge zone of a fold along with the development of axial plane foliation is an evidence of
(A) one phase of deformation (C) no deformation
(B) at least two phases of deformation (D) extensional regime of the deformation
2013
Q.44 The outcrop pattern of folded sedimentary strata on the map given below represents
(A) culmination of antiform (C) depression of antiform
(B) culmination of synform (D) depression of synform
2012
Q.32 In which of the following crystal systems, the characteristic symmetry elements “a two-fold axis of rotation and at least two planes of symmetry” are possible?
(A) Tetragonal (C) Orthorhombic
(B) Hexagonal (D) Monoclinic
Q.43 Which of the following statements is true?
(A) Transposition foliation is an indication of superposed folding
(B) Stratigraphic information is retained in transposition structures
(C) Transposition foliation develops parallel to axial plane of tight
folds
(D) Fold closures can be well identified in transposition structures
Q.47 Study the map below showing elevation of selected locations and outcrops of sedimentary beds.
Which of the following statements is correct?
(A) The beds dip easterly
(C) The beds dip southerly
(B) The beds dip westerly
(D) The beds are folded
2011
Q.11
The surface of discontinuity between older folded sedimentary strata and younger horizontal strata is known as
(A) disconformity (C) angular unconformity
(B) parallel unconformity (D) nonconformity
Common Data for Questions 48 and 49:
The figure below is the schematic geological map of a flat terrane.
Q.48 The strata P, Q and R have been folded into a
(A) north-plunging anticlinal antiform
(C) north-plunging synclinal antiform
(B) south-plunging anticlinal antiform
(D) south-plunging synclinal antiform
Q.49 The granite pluton intruded
(A) before folding and faulting
(B) before faulting but after folding
(C) after development of unconformity but before faulting
(D) after development of unconformity and faulting
2010
Q.5 Outer-crop pattern parallel to topographic contours signifies
[A] horizontal beds
{C} inclined beds
{E} vertical beds
{D} folded beds
Common Data for Questions 48 and 49:
The following geological map exposes three beds, of which the bed P is the oldest and the bed R the youngest
Q48
What type of structure does the map depict?
{A} Faulted anticline
{C} Faultod syncline
{B} Folded strike-slip fault
{D} Folded normal fault
Q.49 Why is bed P wider in Ute area south of fault?
{A} Erosion has removed most of bed P to the north of fault
{B} Folding has caused thinning of bed P to the north of fault
{C} Deeper level of bed P is exposed due to faulting and erosion to the south of fault
{D} Bed P had a variable thickness prior to faulting
Common Data for Questions 71, 72 and 73: The following geologiCal map shows exposures of sedimentary beds p, q, r, s, t and a batholith (hatched) in .a flat terrain.
Q.7l The fold seen in the area is
(A) a synforrn plunging northerly
(C) an antifonn plunging northerly
(B) a synforrn plunging southerly
(D) an antiform plunging southerly
Q.72 If the fault dips 70° southerly, it is a
(A) normal fault with southern upthrown block
(B) right lateral strike-slip fault
(C) reverse fault with northern upthrown block
(D) reverse fault with southern upthrown block
Q.73 The intrusion of dyke took place
(A) after deposition of beds ‘s' and ‘t’
(B) before deposition of beds ‘s’ and ‘t’
(C) before faulting
(D) before folding
2007
Q.1 The maximum curvature of a cylindrically folded surface occurs at the
(A) axial plane
(B) fold axis
(C) hinge
(D) limb
Q.21
An open fold may appear to be isoclinal when viewed in a section
(A) at a low angle to the fold axis
(C) perpendicular to the fold axis
(B) at 45° to the fold axis
(D) parallel to the axial plane
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