Geology and Geophysics
GATE GG-1 format:mcq PYQs
Build your understanding with focused practice from past exam papers.
Questions 121–130 of 422. Imported answers require independent review unless marked reviewed.
Question 17
Open questionGGMCQ1 markNeeds review
The heat production (
) of a granitic rock due to decay of the radioactive elements U, Th and K having concentration
,
, and
, respectively, is given by the expression
Which one of the following correctly represents the relation between the magnitude of coefficients
(in
)?Your answerChoose one option.
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Open questionGGMCQ2 marksNeeds review
Which one of the following Phanerozoic periods has the shortest duration of time?
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Open questionGGMCQ2 marksNeeds review
Based on the given mineral proportions, which one of the following statements is CORRECT?
Rock | Mineral Proportion
X | Olivine : Orthopyroxene : Clinopyroxene :: 50 : 30 : 20
Y | Plagioclase : Alkali feldspar : Quartz :: 25 : 45 : 30
Z | Biotite : Plagioclase : Alkali feldspar : Quartz :: 20 : 25 : 35 : 20
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Which one of the following mineral pair shows solid solubility through coupled substitution of elements?
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The behavior of trace elements in magmatic systems follows
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Choose the CORECT statement regarding crystallization of a single feldspar of composition Or₅₀Ab₅₀ in the Albite-Orthoclase system.
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Given ΔVᵣ and ΔSᵣ are the volume and entropy of reaction, respectively, the most suitable conditions for the reaction to be used as a geothermometer are
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In which one of the given mass extinction events, global cooling that resulted in glaciation and lowering of sea level, is considered as major cause of extinction for more than 50% of marine fauna?
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Processes of fossilization affecting an organism from its death to burial under sediments come under the study of
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Open questionGGMCQ1 markNeeds review
The dip and dip direction of the lee side of a straight crested ripple on modern sediments are found to be 15° and N10°W, respectively. Considering unidirectional water movement, the flow direction is towards
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