Orthorhombic System -Multiple Choice Questions Quiz

Question 1: What is the crystal system in which all three axes are of different lengths and perpendicular to each other?

(a) Cubic system
(b) Tetragonal system
(c) Orthorhombic system
(d) Hexagonal system

Question 2: How many axes of symmetry does the orthorhombic system have?

(a) 1
(b) 2
(c) 3
(d) 4

Question 3: What are the angles between the crystallographic axes in the orthorhombic system?

(a) 60°
(b) 90°
(c) 120°
(d) 180°

Question 4: Which of the following minerals crystallizes in the orthorhombic system?

(a) Quartz
(b) Pyrite
(c) Aragonite
(d) Halite

Question 5: In the orthorhombic system, which crystallographic axis is vertical and perpendicular to the basal plane?

(a) a-axis
(b) b-axis
(c) c-axis
(d) d-axis

Question 6: Which of the following statements is true about the axial ratios in the orthorhombic system?

(a) All three axial ratios are equal.
(b) Two axial ratios are equal, while the third is different.
(c) All three axial ratios are different.
(d) The axial ratios depend on the specific mineral.

Question 7: What is the crystal symmetry of an orthorhombic mineral that exhibits only one plane of symmetry and a center of symmetry?

(a) Triclinic
(b) Monoclinic
(c) Orthorhombic
(d) Hexagonal

Question 8: Which of the following minerals crystallizes in the orthorhombic system and has perfect cleavage in three directions at right angles?

(a) Beryl
(b) Topaz
(c) Kyanite
(d) Olivine

Question 9: What is the total number of symmetry elements present in the orthorhombic system?

(a) 6
(b) 7
(c) 8
(d) 9

Question 10: What is the relationship between the axial ratios a:b:c in the orthorhombic system?

(a) a = b = c
(b) a > b > c
(c) a < b < c
(d) a ≠ b ≠ c

Results:

Total score: /10

Answer key:

Question 1: c

Question 2: b

Question 3: b

Question 4: c

Question 5: c

Question 6: c

Question 7: b

Question 8: c

Question 9: c

Question 10: d

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