Geology and Geophysics
GATE GG-1 topic:crystallography-mineralogy PYQs
Build your understanding with focused practice from past exam papers.
Questions 21–30 of 38. Imported answers require independent review unless marked reviewed.
Question 50
Open questionGGMCQ2 marksNeeds review
The total number of symmetry elements in the crystal class represented by the point group 4/m\bar2/m is
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The ratio of bridging to non-bridging oxygen atoms in the amphibole structure is
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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 64
Open questionGGNAT2 marksNeeds review
The minimum anion-to-cation radius ratio at which a 3-fold coordination becomes possible is __________. [round off to 2 decimal places]
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The mole fraction of jadeite in the pyroxene of composition (Ca₀.₆₆Na₀.₃₃Fe²⁺₀.₁₂₁Fe³⁺₀.₁₂₅Mg₀.₅₄₆Al₀.₂₀₈)Si₂O₆ is __________. [round off to 3 decimal places]
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The intercepts of a crystal face on the crystallographic axes are ∞a, 2b, 3c. Which one of the following is its Miller Index?
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A mineral of uniform composition is cut into a wedge shape. The birefringence of the wedge section is 0.012. The retardation at 40 μm thickness of the wedge is ________ nm. [in integer]
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Open questionGGMSQ2 marksNeeds review
Which among the following space groups is/are non-compatible with glide plane?
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Open questionGG - G1MCQ2 marksNeeds review
The symmetry elements of a point group are: 3 crystallographic axes of 2-fold symmetry and 3 mirror planes perpendicular to the crystallographic axes. The Hermann – Mauguin notation of the point group is:
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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 1
Open questionGL-1MCQ2 marksNeeds review
“Point Group” in crystallography is characterized by a set of symmetry operations such that
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Open questionGL-1MCQ2 marksNeeds review
What are the Miller indices of a plane that intercepts each of the crystallographic axes X, Y and Z, at 20 Å? (Assume a primitive unit-cell with the dimensions
Å,
Å and
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