Geology and Geophysics - GG 2018 GATE Paper with solution GATE Notes | EduRev

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GATE : Geology and Geophysics - GG 2018 GATE Paper with solution GATE Notes | EduRev

 Page 1


GATE 2018                                                                                            General Aptitude (GA) Set-4  
GA 1/2 
Q. 1 – Q. 5 carry one mark each. 
Q.1  “When she fell down the _______, she received many _______ but little help. ” 
 
The words that best fill the blanks in the above sentence are  
 
(A) stairs, stares (B) stairs, stairs 
(C) stares, stairs (D) stares, stares 
 
 
Q.2  “In spite of being warned repeatedly, he failed to correct his _________ behaviour. ” 
 
The word that best fills the blank in the above sentence is  
 
(A) rational (B) reasonable (C) errant (D) good 
 
 
Q.3  For 0 = ?? = 2 ?? , sin ?? and cos ?? are both decreasing functions in the interval ________. 
 
(A) ( 0 ,
?? 2
) (B) (
?? 2
, ?? ) (C) (?? ,
3 ?? 2
) (D) (
3 ?? 2
, 2 ?? ) 
 
 
Q.4  
The area of an equilateral triangle is v 3. What is the perimeter of the triangle? 
 
(A) 2 (B) 4 (C) 6 (D) 8 
 
 
Q.5  Arrange the following three-dimensional objects in the descending order of their volumes: 
(i)  A cuboid with dimensions 10 cm, 8 cm and 6 cm
 
 
(ii)  A cube of side 8 cm 
(iii)  A cylinder with base radius 7 cm and height 7 cm 
(iv)  A sphere of radius 7 cm 
 
(A) (i), (ii), (iii), (iv) 
(B) (ii), (i), (iv), (iii) 
(C) (iii), (ii), (i), (iv) 
(D) (iv), (iii), (ii), (i) 
 
 
 
Q. 6 – Q. 10 carry two marks each. 
 
Q.6  An automobile travels from city A to city B and returns to city A by the same route. The 
speed of the vehicle during the onward and return journeys were constant at 60 km/h and 
90 km/h, respectively. What is the average speed in km/h for the entire journey? 
 
(A) 72 (B) 73 (C) 74 (D) 75 
 
Page 2


GATE 2018                                                                                            General Aptitude (GA) Set-4  
GA 1/2 
Q. 1 – Q. 5 carry one mark each. 
Q.1  “When she fell down the _______, she received many _______ but little help. ” 
 
The words that best fill the blanks in the above sentence are  
 
(A) stairs, stares (B) stairs, stairs 
(C) stares, stairs (D) stares, stares 
 
 
Q.2  “In spite of being warned repeatedly, he failed to correct his _________ behaviour. ” 
 
The word that best fills the blank in the above sentence is  
 
(A) rational (B) reasonable (C) errant (D) good 
 
 
Q.3  For 0 = ?? = 2 ?? , sin ?? and cos ?? are both decreasing functions in the interval ________. 
 
(A) ( 0 ,
?? 2
) (B) (
?? 2
, ?? ) (C) (?? ,
3 ?? 2
) (D) (
3 ?? 2
, 2 ?? ) 
 
 
Q.4  
The area of an equilateral triangle is v 3. What is the perimeter of the triangle? 
 
(A) 2 (B) 4 (C) 6 (D) 8 
 
 
Q.5  Arrange the following three-dimensional objects in the descending order of their volumes: 
(i)  A cuboid with dimensions 10 cm, 8 cm and 6 cm
 
 
(ii)  A cube of side 8 cm 
(iii)  A cylinder with base radius 7 cm and height 7 cm 
(iv)  A sphere of radius 7 cm 
 
(A) (i), (ii), (iii), (iv) 
(B) (ii), (i), (iv), (iii) 
(C) (iii), (ii), (i), (iv) 
(D) (iv), (iii), (ii), (i) 
 
 
 
Q. 6 – Q. 10 carry two marks each. 
 
Q.6  An automobile travels from city A to city B and returns to city A by the same route. The 
speed of the vehicle during the onward and return journeys were constant at 60 km/h and 
90 km/h, respectively. What is the average speed in km/h for the entire journey? 
 
(A) 72 (B) 73 (C) 74 (D) 75 
 
GATE 2018                                                                                            General Aptitude (GA) Set-4  
GA 2/2 
Q.7  A set of 4 parallel lines intersect with another set of 5 parallel lines. How many 
parallelograms are formed? 
 
(A) 20 (B) 48 (C) 60 (D) 72 
 
 
Q.8  To pass a test, a candidate needs to answer at least 2 out of 3 questions correctly. A total of 
6,30,000 candidates appeared for the test. Question A was correctly answered by 3,30,000 
candidates. Question B was answered correctly by 2,50,000 candidates. Question C was 
answered correctly by 2,60,000 candidates. Both questions A and B were answered 
correctly by 1,00,000 candidates. Both questions B and C were answered correctly by 
90,000 candidates. Both questions A and C were answered correctly by 80,000 candidates. 
If the number of students answering all questions correctly is the same as the number 
answering none, how many candidates failed to clear the test? 
 
(A) 30,000 (B) 2,70,000 (C) 3,90,000 (D) 4,20,000 
 
 
Q.9  
If ?? 2
+ ?? - 1 = 0 what is the value of ?? 4
+
1
?? 4
? 
 
(A) 1 (B) 5 (C) 7 (D) 9 
 
 
Q.10  In a detailed study of annual crow births in India, it was found that there was relatively no 
growth during the period 2002 to 2004 and a sudden spike from 2004 to 2005. In another 
unrelated study, it was found that the revenue from cracker sales in India which remained 
fairly flat from 2002 to 2004, saw a sudden spike in 2005 before declining again in 2006. 
The solid line in the graph below refers to annual sale of crackers and the dashed line refers 
to the annual crow births in India. Choose the most appropriate inference from the above 
data. 
 
 
(A) There is a strong correlation between crow birth and cracker sales. 
(B) Cracker usage increases crow birth rate. 
(C) If cracker sale declines, crow birth will decline. 
(D) Increased birth rate of crows will cause an increase in the sale of crackers. 
 
END OF THE QUESTION PAPER 
 
Page 3


GATE 2018                                                                                            General Aptitude (GA) Set-4  
GA 1/2 
Q. 1 – Q. 5 carry one mark each. 
Q.1  “When she fell down the _______, she received many _______ but little help. ” 
 
The words that best fill the blanks in the above sentence are  
 
(A) stairs, stares (B) stairs, stairs 
(C) stares, stairs (D) stares, stares 
 
 
Q.2  “In spite of being warned repeatedly, he failed to correct his _________ behaviour. ” 
 
The word that best fills the blank in the above sentence is  
 
(A) rational (B) reasonable (C) errant (D) good 
 
 
Q.3  For 0 = ?? = 2 ?? , sin ?? and cos ?? are both decreasing functions in the interval ________. 
 
(A) ( 0 ,
?? 2
) (B) (
?? 2
, ?? ) (C) (?? ,
3 ?? 2
) (D) (
3 ?? 2
, 2 ?? ) 
 
 
Q.4  
The area of an equilateral triangle is v 3. What is the perimeter of the triangle? 
 
(A) 2 (B) 4 (C) 6 (D) 8 
 
 
Q.5  Arrange the following three-dimensional objects in the descending order of their volumes: 
(i)  A cuboid with dimensions 10 cm, 8 cm and 6 cm
 
 
(ii)  A cube of side 8 cm 
(iii)  A cylinder with base radius 7 cm and height 7 cm 
(iv)  A sphere of radius 7 cm 
 
(A) (i), (ii), (iii), (iv) 
(B) (ii), (i), (iv), (iii) 
(C) (iii), (ii), (i), (iv) 
(D) (iv), (iii), (ii), (i) 
 
 
 
Q. 6 – Q. 10 carry two marks each. 
 
Q.6  An automobile travels from city A to city B and returns to city A by the same route. The 
speed of the vehicle during the onward and return journeys were constant at 60 km/h and 
90 km/h, respectively. What is the average speed in km/h for the entire journey? 
 
(A) 72 (B) 73 (C) 74 (D) 75 
 
GATE 2018                                                                                            General Aptitude (GA) Set-4  
GA 2/2 
Q.7  A set of 4 parallel lines intersect with another set of 5 parallel lines. How many 
parallelograms are formed? 
 
(A) 20 (B) 48 (C) 60 (D) 72 
 
 
Q.8  To pass a test, a candidate needs to answer at least 2 out of 3 questions correctly. A total of 
6,30,000 candidates appeared for the test. Question A was correctly answered by 3,30,000 
candidates. Question B was answered correctly by 2,50,000 candidates. Question C was 
answered correctly by 2,60,000 candidates. Both questions A and B were answered 
correctly by 1,00,000 candidates. Both questions B and C were answered correctly by 
90,000 candidates. Both questions A and C were answered correctly by 80,000 candidates. 
If the number of students answering all questions correctly is the same as the number 
answering none, how many candidates failed to clear the test? 
 
(A) 30,000 (B) 2,70,000 (C) 3,90,000 (D) 4,20,000 
 
 
Q.9  
If ?? 2
+ ?? - 1 = 0 what is the value of ?? 4
+
1
?? 4
? 
 
(A) 1 (B) 5 (C) 7 (D) 9 
 
 
Q.10  In a detailed study of annual crow births in India, it was found that there was relatively no 
growth during the period 2002 to 2004 and a sudden spike from 2004 to 2005. In another 
unrelated study, it was found that the revenue from cracker sales in India which remained 
fairly flat from 2002 to 2004, saw a sudden spike in 2005 before declining again in 2006. 
The solid line in the graph below refers to annual sale of crackers and the dashed line refers 
to the annual crow births in India. Choose the most appropriate inference from the above 
data. 
 
 
(A) There is a strong correlation between crow birth and cracker sales. 
(B) Cracker usage increases crow birth rate. 
(C) If cracker sale declines, crow birth will decline. 
(D) Increased birth rate of crows will cause an increase in the sale of crackers. 
 
END OF THE QUESTION PAPER 
 
GATE 2018   GEOLOGY AND GEOPHYSICS 
GG 1/20 
PART A: COMPULSORY SECTION FOR ALL CANDIDATES 
Q. 1 – Q. 25 carry one mark each. 
Q.1  Which one of the following periods has the longest time duration? 
(A)  Ordovician  (B)  Cretaceous (C)  Jurassic  (D)  Silurian 
 
 
Q.2  A siliciclastic sedimentary rock consisting predominantly of the same type of gravel-sized 
clasts is called 
(A)  Polymict conglomerate. (B)  Arkose. 
(C)  Oligomict conglomerate. (D)  Petromict conglomerate. 
 
 
Q.3  Brown coal that has high moisture content and commonly retains many of the original 
wood fragments is called  
(A)  Anthracite. (B)  Bituminous coal. 
(C)  Lignite. (D)  Peat. 
 
 
Q.4  The speed of revolution of the Earth around the Sun is  
(A)  maximum at Perihelion. 
(B)  minimum at Perihelion. 
(C)  maximum at Aphelion. 
(D)  equal at Aphelion and Perihelion. 
 
 
Q.5  The geometrical factor for the following electrode configuration is 
 
 
(A)  ???? (B)  2???? (C)  3???? (D)  4???? 
 
 
Q.6  Which one of the following geophysical methods uses the physical property ‘Dielectric 
Constant’? 
(A)  Gravity  (B)  Ground Penetrating Radar  
(C)  Seismic  (D)  Self-Potential 
 
 
Q.7  Pascal second is a unit of 
(A)  seepage force. (B)  dynamic viscosity. 
(C)  kinematic viscosity. (D)  permeability. 
 
 
Page 4


GATE 2018                                                                                            General Aptitude (GA) Set-4  
GA 1/2 
Q. 1 – Q. 5 carry one mark each. 
Q.1  “When she fell down the _______, she received many _______ but little help. ” 
 
The words that best fill the blanks in the above sentence are  
 
(A) stairs, stares (B) stairs, stairs 
(C) stares, stairs (D) stares, stares 
 
 
Q.2  “In spite of being warned repeatedly, he failed to correct his _________ behaviour. ” 
 
The word that best fills the blank in the above sentence is  
 
(A) rational (B) reasonable (C) errant (D) good 
 
 
Q.3  For 0 = ?? = 2 ?? , sin ?? and cos ?? are both decreasing functions in the interval ________. 
 
(A) ( 0 ,
?? 2
) (B) (
?? 2
, ?? ) (C) (?? ,
3 ?? 2
) (D) (
3 ?? 2
, 2 ?? ) 
 
 
Q.4  
The area of an equilateral triangle is v 3. What is the perimeter of the triangle? 
 
(A) 2 (B) 4 (C) 6 (D) 8 
 
 
Q.5  Arrange the following three-dimensional objects in the descending order of their volumes: 
(i)  A cuboid with dimensions 10 cm, 8 cm and 6 cm
 
 
(ii)  A cube of side 8 cm 
(iii)  A cylinder with base radius 7 cm and height 7 cm 
(iv)  A sphere of radius 7 cm 
 
(A) (i), (ii), (iii), (iv) 
(B) (ii), (i), (iv), (iii) 
(C) (iii), (ii), (i), (iv) 
(D) (iv), (iii), (ii), (i) 
 
 
 
Q. 6 – Q. 10 carry two marks each. 
 
Q.6  An automobile travels from city A to city B and returns to city A by the same route. The 
speed of the vehicle during the onward and return journeys were constant at 60 km/h and 
90 km/h, respectively. What is the average speed in km/h for the entire journey? 
 
(A) 72 (B) 73 (C) 74 (D) 75 
 
GATE 2018                                                                                            General Aptitude (GA) Set-4  
GA 2/2 
Q.7  A set of 4 parallel lines intersect with another set of 5 parallel lines. How many 
parallelograms are formed? 
 
(A) 20 (B) 48 (C) 60 (D) 72 
 
 
Q.8  To pass a test, a candidate needs to answer at least 2 out of 3 questions correctly. A total of 
6,30,000 candidates appeared for the test. Question A was correctly answered by 3,30,000 
candidates. Question B was answered correctly by 2,50,000 candidates. Question C was 
answered correctly by 2,60,000 candidates. Both questions A and B were answered 
correctly by 1,00,000 candidates. Both questions B and C were answered correctly by 
90,000 candidates. Both questions A and C were answered correctly by 80,000 candidates. 
If the number of students answering all questions correctly is the same as the number 
answering none, how many candidates failed to clear the test? 
 
(A) 30,000 (B) 2,70,000 (C) 3,90,000 (D) 4,20,000 
 
 
Q.9  
If ?? 2
+ ?? - 1 = 0 what is the value of ?? 4
+
1
?? 4
? 
 
(A) 1 (B) 5 (C) 7 (D) 9 
 
 
Q.10  In a detailed study of annual crow births in India, it was found that there was relatively no 
growth during the period 2002 to 2004 and a sudden spike from 2004 to 2005. In another 
unrelated study, it was found that the revenue from cracker sales in India which remained 
fairly flat from 2002 to 2004, saw a sudden spike in 2005 before declining again in 2006. 
The solid line in the graph below refers to annual sale of crackers and the dashed line refers 
to the annual crow births in India. Choose the most appropriate inference from the above 
data. 
 
 
(A) There is a strong correlation between crow birth and cracker sales. 
(B) Cracker usage increases crow birth rate. 
(C) If cracker sale declines, crow birth will decline. 
(D) Increased birth rate of crows will cause an increase in the sale of crackers. 
 
END OF THE QUESTION PAPER 
 
GATE 2018   GEOLOGY AND GEOPHYSICS 
GG 1/20 
PART A: COMPULSORY SECTION FOR ALL CANDIDATES 
Q. 1 – Q. 25 carry one mark each. 
Q.1  Which one of the following periods has the longest time duration? 
(A)  Ordovician  (B)  Cretaceous (C)  Jurassic  (D)  Silurian 
 
 
Q.2  A siliciclastic sedimentary rock consisting predominantly of the same type of gravel-sized 
clasts is called 
(A)  Polymict conglomerate. (B)  Arkose. 
(C)  Oligomict conglomerate. (D)  Petromict conglomerate. 
 
 
Q.3  Brown coal that has high moisture content and commonly retains many of the original 
wood fragments is called  
(A)  Anthracite. (B)  Bituminous coal. 
(C)  Lignite. (D)  Peat. 
 
 
Q.4  The speed of revolution of the Earth around the Sun is  
(A)  maximum at Perihelion. 
(B)  minimum at Perihelion. 
(C)  maximum at Aphelion. 
(D)  equal at Aphelion and Perihelion. 
 
 
Q.5  The geometrical factor for the following electrode configuration is 
 
 
(A)  ???? (B)  2???? (C)  3???? (D)  4???? 
 
 
Q.6  Which one of the following geophysical methods uses the physical property ‘Dielectric 
Constant’? 
(A)  Gravity  (B)  Ground Penetrating Radar  
(C)  Seismic  (D)  Self-Potential 
 
 
Q.7  Pascal second is a unit of 
(A)  seepage force. (B)  dynamic viscosity. 
(C)  kinematic viscosity. (D)  permeability. 
 
 
GATE 2018   GEOLOGY AND GEOPHYSICS 
GG 2/20 
Q.8  Which one of the following statements is CORRECT? 
(A)  Strength of a rock decreases with increase in confining pressure. 
(B)  Strength of a rock increases with increase in temperature. 
(C)  Strength of a rock increases with increase in strain rate. 
(D)  Strength of a rock increases with increase in pore water pressure. 
 
 
Q.9  The geomorphic feature ‘horns’ are formed by 
(A)  wind erosion. (B)  river erosion. 
(C)  wind deposition. (D)  glacial erosion. 
 
 
Q.10  A melanocratic porphyritic rock containing phenocrysts of biotite, with feldspar restricted 
to the groundmass, is called 
(A)  trachyte. (B)  dacite.  (C)  andesite. (D)  lamprophyre. 
 
 
Q.11  The supercontinent that existed in the late Mesoproterozoic to early Neoproterozoic time 
was 
(A)  Kenorland. (B)  Columbia. (C)  Rodinia. (D)  Pangaea. 
 
 
Q.12  The figure below shows the triple junction between three plates A, B and C. The boundary 
between the plates A and B is a ridge with a half-spreading rate of 4 cm/year. The A-C and 
B-C boundaries are collinear and orthogonal to the A-B ridge. The A-C boundary is a 
dextral transform fault with a relative velocity of 6 cm/year. The boundary between plates 
B and C is a 
 
 
 
(A)  dextral transform fault with a relative velocity of 10 cm/year. 
(B)  dextral transform fault with a relative velocity of 2 cm/year. 
(C)  sinistral transform fault with a relative velocity of 2 cm/year. 
(D)  sinistral transform fault with a relative velocity of 6 cm/year. 
 
 
Page 5


GATE 2018                                                                                            General Aptitude (GA) Set-4  
GA 1/2 
Q. 1 – Q. 5 carry one mark each. 
Q.1  “When she fell down the _______, she received many _______ but little help. ” 
 
The words that best fill the blanks in the above sentence are  
 
(A) stairs, stares (B) stairs, stairs 
(C) stares, stairs (D) stares, stares 
 
 
Q.2  “In spite of being warned repeatedly, he failed to correct his _________ behaviour. ” 
 
The word that best fills the blank in the above sentence is  
 
(A) rational (B) reasonable (C) errant (D) good 
 
 
Q.3  For 0 = ?? = 2 ?? , sin ?? and cos ?? are both decreasing functions in the interval ________. 
 
(A) ( 0 ,
?? 2
) (B) (
?? 2
, ?? ) (C) (?? ,
3 ?? 2
) (D) (
3 ?? 2
, 2 ?? ) 
 
 
Q.4  
The area of an equilateral triangle is v 3. What is the perimeter of the triangle? 
 
(A) 2 (B) 4 (C) 6 (D) 8 
 
 
Q.5  Arrange the following three-dimensional objects in the descending order of their volumes: 
(i)  A cuboid with dimensions 10 cm, 8 cm and 6 cm
 
 
(ii)  A cube of side 8 cm 
(iii)  A cylinder with base radius 7 cm and height 7 cm 
(iv)  A sphere of radius 7 cm 
 
(A) (i), (ii), (iii), (iv) 
(B) (ii), (i), (iv), (iii) 
(C) (iii), (ii), (i), (iv) 
(D) (iv), (iii), (ii), (i) 
 
 
 
Q. 6 – Q. 10 carry two marks each. 
 
Q.6  An automobile travels from city A to city B and returns to city A by the same route. The 
speed of the vehicle during the onward and return journeys were constant at 60 km/h and 
90 km/h, respectively. What is the average speed in km/h for the entire journey? 
 
(A) 72 (B) 73 (C) 74 (D) 75 
 
GATE 2018                                                                                            General Aptitude (GA) Set-4  
GA 2/2 
Q.7  A set of 4 parallel lines intersect with another set of 5 parallel lines. How many 
parallelograms are formed? 
 
(A) 20 (B) 48 (C) 60 (D) 72 
 
 
Q.8  To pass a test, a candidate needs to answer at least 2 out of 3 questions correctly. A total of 
6,30,000 candidates appeared for the test. Question A was correctly answered by 3,30,000 
candidates. Question B was answered correctly by 2,50,000 candidates. Question C was 
answered correctly by 2,60,000 candidates. Both questions A and B were answered 
correctly by 1,00,000 candidates. Both questions B and C were answered correctly by 
90,000 candidates. Both questions A and C were answered correctly by 80,000 candidates. 
If the number of students answering all questions correctly is the same as the number 
answering none, how many candidates failed to clear the test? 
 
(A) 30,000 (B) 2,70,000 (C) 3,90,000 (D) 4,20,000 
 
 
Q.9  
If ?? 2
+ ?? - 1 = 0 what is the value of ?? 4
+
1
?? 4
? 
 
(A) 1 (B) 5 (C) 7 (D) 9 
 
 
Q.10  In a detailed study of annual crow births in India, it was found that there was relatively no 
growth during the period 2002 to 2004 and a sudden spike from 2004 to 2005. In another 
unrelated study, it was found that the revenue from cracker sales in India which remained 
fairly flat from 2002 to 2004, saw a sudden spike in 2005 before declining again in 2006. 
The solid line in the graph below refers to annual sale of crackers and the dashed line refers 
to the annual crow births in India. Choose the most appropriate inference from the above 
data. 
 
 
(A) There is a strong correlation between crow birth and cracker sales. 
(B) Cracker usage increases crow birth rate. 
(C) If cracker sale declines, crow birth will decline. 
(D) Increased birth rate of crows will cause an increase in the sale of crackers. 
 
END OF THE QUESTION PAPER 
 
GATE 2018   GEOLOGY AND GEOPHYSICS 
GG 1/20 
PART A: COMPULSORY SECTION FOR ALL CANDIDATES 
Q. 1 – Q. 25 carry one mark each. 
Q.1  Which one of the following periods has the longest time duration? 
(A)  Ordovician  (B)  Cretaceous (C)  Jurassic  (D)  Silurian 
 
 
Q.2  A siliciclastic sedimentary rock consisting predominantly of the same type of gravel-sized 
clasts is called 
(A)  Polymict conglomerate. (B)  Arkose. 
(C)  Oligomict conglomerate. (D)  Petromict conglomerate. 
 
 
Q.3  Brown coal that has high moisture content and commonly retains many of the original 
wood fragments is called  
(A)  Anthracite. (B)  Bituminous coal. 
(C)  Lignite. (D)  Peat. 
 
 
Q.4  The speed of revolution of the Earth around the Sun is  
(A)  maximum at Perihelion. 
(B)  minimum at Perihelion. 
(C)  maximum at Aphelion. 
(D)  equal at Aphelion and Perihelion. 
 
 
Q.5  The geometrical factor for the following electrode configuration is 
 
 
(A)  ???? (B)  2???? (C)  3???? (D)  4???? 
 
 
Q.6  Which one of the following geophysical methods uses the physical property ‘Dielectric 
Constant’? 
(A)  Gravity  (B)  Ground Penetrating Radar  
(C)  Seismic  (D)  Self-Potential 
 
 
Q.7  Pascal second is a unit of 
(A)  seepage force. (B)  dynamic viscosity. 
(C)  kinematic viscosity. (D)  permeability. 
 
 
GATE 2018   GEOLOGY AND GEOPHYSICS 
GG 2/20 
Q.8  Which one of the following statements is CORRECT? 
(A)  Strength of a rock decreases with increase in confining pressure. 
(B)  Strength of a rock increases with increase in temperature. 
(C)  Strength of a rock increases with increase in strain rate. 
(D)  Strength of a rock increases with increase in pore water pressure. 
 
 
Q.9  The geomorphic feature ‘horns’ are formed by 
(A)  wind erosion. (B)  river erosion. 
(C)  wind deposition. (D)  glacial erosion. 
 
 
Q.10  A melanocratic porphyritic rock containing phenocrysts of biotite, with feldspar restricted 
to the groundmass, is called 
(A)  trachyte. (B)  dacite.  (C)  andesite. (D)  lamprophyre. 
 
 
Q.11  The supercontinent that existed in the late Mesoproterozoic to early Neoproterozoic time 
was 
(A)  Kenorland. (B)  Columbia. (C)  Rodinia. (D)  Pangaea. 
 
 
Q.12  The figure below shows the triple junction between three plates A, B and C. The boundary 
between the plates A and B is a ridge with a half-spreading rate of 4 cm/year. The A-C and 
B-C boundaries are collinear and orthogonal to the A-B ridge. The A-C boundary is a 
dextral transform fault with a relative velocity of 6 cm/year. The boundary between plates 
B and C is a 
 
 
 
(A)  dextral transform fault with a relative velocity of 10 cm/year. 
(B)  dextral transform fault with a relative velocity of 2 cm/year. 
(C)  sinistral transform fault with a relative velocity of 2 cm/year. 
(D)  sinistral transform fault with a relative velocity of 6 cm/year. 
 
 
GATE 2018   GEOLOGY AND GEOPHYSICS 
GG 3/20 
Q.13  A rock follows Mohr-Coulomb failure criterion. Which one of the Mohr-Coulomb failure 
envelopes shown below allows failure of the rock under stress state Y, but not under stress 
state X? 
 
 
(A)  PP ’ (B)  QQ ’  (C)  RR ’  (D)  SS ’  
 
 
Q.14  The maximum and the minimum principal stresses are denoted by s1 and s3, respectively. 
The differential stress can have an absolute value greater than s1 when  
(A)  s1 and s3 are both compressive. 
(B)  s1 is compressive and s3 is tensile. 
(C)  s1 and s3 are equal. 
(D)  s1 and s3 are both tensile. 
 
 
Q.15  The geoid can be best defined as  
(A)  an oblate spheroid that best approximates the shape of the earth. 
(B)  a surface over which the value of gravity is constant. 
(C)  the physical surface of the earth. 
(D)  an equipotential surface of gravity of the earth. 
 
 
 
 
 
 
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