Earth Science Geology Question Paper
Crystallography Geology Objective Test Paper
Q.1: Orthorhombic system shows the plane of symmetry as:
(a) Axial only.
(b) Diagonal only.
(c) Axial and Diagonal.
(d) lndetermined.
Answer. (a)
Q.2: What will be the symbol of Macro dome:
(a) okl.
(b) hol.
(c) hkl.
(d) hko.
Answer. (b)
Q.3: What is the characteristic symmetry of Monoclinic system:
(a) 2 axis of ll fold.
(b) 1 axis of ll fold.
(c) 1 axis of Ill fold.
(d) 2 axis of IV fold.
Answer. (b)
Q.4: Mark the correct one regarding orientation of the triclinic crystal:
(a) Any axis is placed vertically.
(b) The longer lateral axis is made to extend downwards to the right.
(c) The front-rear axis downward to the front.
(d) All are correct.
Answer. (d)
Q.41: All the forms of normal class of triclinic system are:
(a) Pinacoids.
(b) Pedions.
(c) Prisms.
(d) Pyramids.
Answer. (a)
Q.5: Zonal crystals sometimes occur due to:
(a) Interruption in crystallization.
(b) Presence of some impurities.
(c) Presence of pigments at certain moments of crystallization.
(d) All the above.
Answer. (d)
Q.6: The two diameters of a stereographic projection representing the axes are always at:
(a) 45 degrees.
(b) 60 degrees.
(c) 90 degrees.
(d) 120 degrees.
Answer. (c)
Q.7: Mark the correct statement:
(a) Twinned crystals consisting of same substance.
(b) Twinning produced due to crystal inter growth.
(b) One-half of the twinned crystal is produced by rotation of 180°
(d) All statements are correct.
Answer. (d)
Q.8: The cleavages in twinned crystals are:
(a) In same directions.
(b) ln different directions.
(c) In oblique direction of the twin plane.
(d) Parallel to the twin plane.
Answer. (b)
Q.9: Pericline twin is found in:
(a) Staurolite.
(b) Pyrite.
(c) Rutile.
(d) Plagioclare.
Answer. (d)
Q.10: In tetragonal system, faces which are parallel to the vertical axis while meeting the
horizontal axes at unequal distances are known as :
(a) Prism of the first order.
(b) Pinacoid.
(c) Ditetragonal prism.
(d) Prism of the second order.
Answer. (c)
Q.11: What is the symbol for prism of the 1st order of Normal class of Hexagonal system:
(a) 1010.
(b) 1120.
(c) 1101.
(d) 0110.
Answer. (a)
Q.12: Orthorhombic system shows the plane of symmetry as:
(a) Axial only.
(b) Diagonal only.
(c) Axial and Diagonal.
(d) lndetermined.
Answer. (a)
Q.13: What will be the symbol of Macro dome:
(a) okl.
(b) hol.
(c) hkl.
(d) hko.
Answer. (b)
Q.16: What is the characteristic symmetry of Monoclinic system:
(a) 2 axis of ll fold.
(b) 1 axis of ll fold.
(c) 1 axis of Ill fold.
(d) 2 axis of IV fold.
Answer. (b)
Q.17: Mark the correct one regarding orientation of the triclinic crystal:
(a) Any axis is placed vertically.
(b) The longer lateral axis is made to extend downwards to the right.
(c) The front-rear axis downward to the front.
(d) All are correct.
Answer. (d)
Q.18: 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.19. Which mineral is not crystallised in Orthorhombic system:
(a) Sulphur.
(b) Staurolite.
(c) Augite.
(d) Andalusite.
Answer. (c)
Q.20: 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.21: The normal class of monoclinic system is:
(a) Barite type.
(b) Beryl type.
(c) Gypsum type.
(d) Aximite type.
Answer. (c)
Q.22: Mark incorrect statement regarding symmetry of normal class of Triclinic system:
(a) No plane of symmetry.
(b) No axis of symmetry.
(c) No centre of symmetry.
(d) Centre of symmetry present.
Answer. (c)
Q.23: The pedial class of Triclinic system is characterised by:
(a) 4 axes of 3 fold symmetry.
(b) 1 axes of 4 fold symmetry.
(c) No plane, no axis, and no centre of symmetry.
(d) Only one plane of symmetry.
Answer. (c)
Q.24: Stereogram of a crystal shows primarily:
(a) The interfacial angles projected on the stereogram in the forms of arcs and straight lines.
(b) The distribution of faces in the zones.
(c) A symmetry in the distribution of faces.
(d) All the above.
Answer. (d)
Q.25: The Gnomonic projection to be derived from the:
(a) Horizontal projection.
(b) Spherical projection.
(c) lnclinal projection.
(d) None of these.
Answer. (b)
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