The symbol P-1 represents a space group containing:
Anonymous Quiz
35%
Twofold screw symmetry
39%
Inversion symmetry
24%
Glide symmetry
2%
Threefold rotation
A twin produced by reflection across a plane is called a:
Anonymous Quiz
69%
Reflection twin
12%
Rotation twin
10%
Translation twin
10%
Screw twin
In penetration twinning, the twin individuals:
Anonymous Quiz
10%
Have unrelated orientations
16%
Share only one boundary
14%
Remain completely separate
59%
Interpenetrate one another
A contact twin is characterized by individuals that:
Anonymous Quiz
2%
Contain no twin boundary
27%
Completely overlap internally
15%
Have identical orientations
56%
Meet along a composition surface
Which symmetry element is characteristic of a screw axis?
Anonymous Quiz
53%
Rotation plus translation
19%
Reflection plus inversion
26%
Rotation plus inversion
2%
Translation only
If two plane poles are separated by 90° on a stereogram, the corresponding planes are:
Anonymous Quiz
14%
Parallel
71%
Perpendicular
2%
Identical
14%
Complementary only
A plane whose pole lies at the center of a stereographic projection is:
Anonymous Quiz
32%
Vertical
30%
Horizontal
19%
Inclined 45°
19%
Parallel to projection plane
A vertical plane is represented on a standard stereogram by a:
Anonymous Quiz
42%
Diameter through the center
35%
Single center point
13%
Small circle only
10%
Concentric outer ring
Which space-group feature distinguishes a screw axis from a simple rotation axis?
Anonymous Quiz
51%
Associated translation
35%
Crystal inversion
14%
Plane reflection
0%
Unit-cell centering
Which feature distinguishes a glide plane from an ordinary mirror plane?
Anonymous Quiz
21%
Inversion center
17%
Twofold rotation
58%
Associated translation
4%
Crystal centering
What is the principal significance of a space group compared with a point group?
Anonymous Quiz
44%
It includes translational symmetry
16%
It excludes rotational symmetry
26%
It describes only crystal morphology
14%
It contains fewer symmetry operations
A merohedral twin occurs when the twin operation belongs to the:
Anonymous Quiz
11%
External morphology group
42%
Point group of another crystal
16%
Translation subgroup only
31%
Holohedry of the lattice
Which statement correctly distinguishes point groups from space groups?
Anonymous Quiz
41%
Space groups include translations
9%
Point groups require screw axes
8%
Space groups exclude rotations
42%
Point groups describe lattice centering
The maximum number of three-dimensional crystallographic point groups is:
Anonymous Quiz
9%
C)14
46%
B)230
42%
A)32
3%
D)17
GeoSyn™ Geology Quiz & Notes
🎉 Congratulations to everyone who is comfortably above the predicted cutoff! Your hard work is paying off. Keep going until the official result is out. ⚠️ Important: These are predicted cutoffs, NOT the final official cutoffs. If your score is around the…
• I had already told you that the cutoff was expected to be unexpectedly high this time.
• I also advised you not to rely on predictions that kept the cutoff low and gave false hopes.
• Anyways, congratulations to everyone who got selected! 🎉
Please let me know your results at @sayanite.
• And to those who couldn’t make it this time don’t lose hope. Keep practicing consistently and work on your weak areas.
• Practice daily, stay consistent, and you will make it in the next attempt. 💪
Good night everyone. 🌙
• I also advised you not to rely on predictions that kept the cutoff low and gave false hopes.
• Anyways, congratulations to everyone who got selected! 🎉
Please let me know your results at @sayanite.
• And to those who couldn’t make it this time don’t lose hope. Keep practicing consistently and work on your weak areas.
• Practice daily, stay consistent, and you will make it in the next attempt. 💪
Good night everyone. 🌙
❤5