Geology (Crystallography) Test Paper
Free Solved Geology Test Online
Q.1: Match the following:
I ll
1. Law of constancy of interfacial-angle. i. Symmetry in all crystals of a particular specie
is constant.
2. Law of axial-ratio. ii. Ratio between lengths of axes of crystals of a
given substance is constant.
3. Law of constancy of symmetry. iii. interfacial-angle of crystals of a particular
mineral remain constant.
4. Law of rational-indices. iv. The external form of crystals of same substance
may differ.
(a) 1-iv, 2-ii, 3-i, 4-iii. .
(b) 1-iii, 2-ii, 3-i, 4-iv.
(c) 1-ii, 2-iii, 3-iv, 4-i.
(d) 1-iii, 2-ii, 3-iv, 4-i.
Answer. (b)
Q.2: The highest degree of symmetry is shown by.... and the lowest degree of symmetry is
shown by .... respectively:
(a) Cubic system and Triclinic system.
(b) Cubic system and Monoclinic system.
(c) Hexagonal system and monoclinic system.
(d) Tetragonal system and monoclinic system.
Answer. (a)
Q.3: The Isometric system is characterised by:
(a) 3 axes of 4 fold symmetry
(b) 4 axes of 3 fold symmetry.
(c) 2 axes of 4 fold symmetry
(d) 6 axes of 5 fold symmetry
Answer. (b)
Q.4: Match the following correctly:
I II
1. Dodecahedron. I.Trapezium face
2. Trapezohedron. ii. Sclene triangle
3. Trisoctahedron. iii. Rhombic face.
4. Hexaoctahedron. iv. Isoscales.
(a) 1-I, 2-ii, 3-iii, 4-iv
(b) 1-iii, 2-I, 3-iv, 4-ii
(c) 1-iv, 2-iii, 3-ii, 4-i
(d) 1-iii, 2-i, 3-ii, 4-iv
Answer. (b)
Q.5: TetragonaI system is characterised by:
(a) Plane of symmetry.
(b) Axis of symmetry.
(c) Centre of symmetry.
(d) All the above.
Answer. (b)
Q.6: Mark the correct statement regarding three horizontal axes of Hexagonal system:
(a) Equal in length.
(b) Interchangeable.
(c) lntersecting each other at angles of 60
(d) All the correct.
Answer. (d)
Q.7: The faces, edges and solid angles have a definite relationship with each other. This
relationship is expressed by:
(a) Prowen’s formula.
(b) Nicholas’s formula.
(c) Euler’s formula.
(d) None of these.
Answer. (c)
Q.8: The crystal form which do not have eighter plane or centre of symmetry are known as:
(a) Hemihedral form.
(b) Hemi-morphic form.
(c) Enantiomorphic form.
(d) Tetrahedral form.
Answer. (c)
Q.9: Diametral prisms formed by the combination of:
(a) Four pedions.
(b) Two pinacoids.
(c) Three prisms.
(d) Three pinacoids.
Answer. (d)
Q.10: Match the following:
I ll
1. Centre of symmetry. i. Repetition is with respect to a plane.
2. Axis of symmetry. ii. Repetition is with respect to a line.
3. Plane of symmetry. iii. Repetition is with respect to a point.
(a) 1-iii, 2-ii, 3-i.
(b) 1-ii, 2-i, 3-iii.
(c) 1-i, 2-ii, 3-iii.
(d) None of the above.
Answer. (a)
Q.11: What is the maximum number of plane of symmetry found in known crystal systems:
(a) 5.
(b) 6.
(c) 9.
(d) 11.
Answer. (c)
Q.12: Mark the correct statement about the “Law of constancy of Interfacial-angle”:
(a) The interfacial-angles of crystals of a particular mineral remain always constant.
(b) The atomic structure of the crystals of a particular mineral is fixed.
(c) The position of faces of the crystals of a particular mineral is equal.
(d) All are correct.
Answer. (d)
Q.13: Law of rational-indices mainly base on the position of:
(a) Faces.
(b) Edges.
(c) Solid angles.
(d) lnter-facial angle.
Answer. (a)
Q.14: Which crystal system is having maximum number of classes:
(a) Cubic system.
(b) Tetrahedral system.
(c) Hexagonal system.
(d) Orthorhombic system.
Answer. (c)
Q.15: In which crystal system, majority of minerals crystallizes:
(a) Cubic system.
(b) Tetragonal system.
(c) Orthorhombic system.
(d) Monoclinic system.
Answer. (d)
Q.16: Match the following correctly:
I II
1. lsometric system. i. Galena-type.
2. Hexagonal system. ii. Beryl-type.
3. Tetragonal system. iii. Zircon-type.
4. Orthorhombic system. iv. Baryte-type
(a) 1-i, 2-ii, 3-iii, 4-iv.
(b) 1-ii, 2-iv, 3-iii, 4- i.
(c) 1-iv, 2-ii, sin, 4-i.
(d) 1-i, 2-iv, 3-iii, 4-ii.
Answer. (a)
Q.17: Mark the correct one regarding symmetry of Galena-type class of lsometric
system:
(a) 6 plane of symmetry, 13 axes of symmetry and centre of symmetry present
(b) 13 plane of symmetry, 9 axes of symmetry and centre of symmetry present
(c) 9 plane of symmetry, 13 axes of symmetry and centre of symmetry present
(d) None of these.
Answer. (c)
Q.18: what is the normal interfacial angle in dodecahedron form of cubic system:
(a) 60°
(b) 45°
(c) 9O°
(d) 120°
Answer. (a)
Q.19: Gyroidal class belongs to:
(a) Isometric system.
(b) Tetragonal system.
(c) Hexagonal system.
(d) Orthorhombic system.
Answer. (a)
Q.20: Zircon mineral shows the combination of:
(a) Prism and First order pyramid.
(b) Prism and second order pyramid.
(c) Pyramids only.
(d) Basal pinacoid and prism.
Answer. (a)
Q.21: Mark the mineral which is not the example of Hexagonal system:
(a) Quartz.
(b) Tourmaline.
(c) Haematite.
(d) Topaz.
Answer. (d)
Q.22: ln orthorhombic system the ‘a’ axis is known as.... and the ‘b’ axis is known as
respectively:
(a) Macro axis and Brachy axis.
(b) Brachy axis and Macro axis.
(c) Macro both.
(d) Brachy both.
Answer. (b)
Q.23. Which mineral is not crystallised in Orthorhombic system:
(a) Sulphur.
(b) Staurolite.
(c) Augite.
(d) Andalusite.
Answer. (c)
Q.24: ln monoclinic system the ‘b’ axis known as the.... and the ‘a’ axis known as….
Respectively:
(a) Ortho axis and Clino axis.
(b) Clino axis and Ortho axis.
(c) Clino axis and Brachy axis.
(d) Ortho axis and Macro axis.
Answer. (a)
Q.25: The normal class of monoclinic system is:
(a) Barite type.
(b) Beryl type.
(c) Gypsum type.
(d) Aximite type.
Answer. (c)
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