Geology and Geophysics
2021 · Paper 1
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Complete GATE GG-1 2021 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 52–54 of 65. Imported answers require review unless explicitly marked reviewed.
Question 42
Open questionGG - G1MCQ2 marksNeeds review
A mantle source rock melts at a time t₀ giving rise to melt (M) and residue (R). Which of the following statements is CORRECT about evolution of the (ⁱ⁴³Nd/ⁱ⁴⁴Nd) and (⁸⁷Sr/⁸⁶Sr) isotope ratio in M (that crystallized to form a rock) and R?
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Open questionGG - G1NAT2 marksNeeds review
The mole percentages of SiO₂, Al₂O₃ and K₂O in a granitic rock are 84.21, 7.89 and 7.89, respectively. The molar proportion (in %) of K-feldspar in the rock is ______. [round off to one decimal place]
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 44
Open questionGG - G1NAT2 marksNeeds review
In a zone of active normal faulting, the maximum and minimum in situ principal stresses (compressive in nature) are 30 MPa (s₁) and 10 MPa (s₃), respectively. The fault plane striking N-S has a dip amount of 60° towards E. Considering Anderson theory of faulting and using the given information, the calculated normal stress on the fault plane is ______ MPa. [in integer]
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