IOCL Test Geology MCQ Paper
Earth Science Practice Paper
Q.1: Twinned crystals are characterised by:
(a) Solid angle.
(b) Re-entrant angle.
(c) Extinction angle.
(d) None of these.
Answer. (b)
Q.2: Butterfly twinning is found in:
(a) Rutile.
(b) Gypsum.
(c) Aragonite.
(d) Pyrite.
Answer. (b)
Q.3: Minerals are:
a) Inorganic substances.
b) Having definit chemical composition.
c) Having fixed atomic structures.
d) All statements are correct.
Answer. (d)
Q.4: Acicular habit is shown by:
a) Calcite
b) Orpiment
c) Natrolite
d) Zircon
Answer. (c)
Q.5: Variation in Colour of a mineral may be due to:
a) Composition difference
b) Presence of impurities
c) Surface alteration
d) All the above
Answer. (d)
Q.6: Match the following
I ll
1) Hematite 1) White streak
2) Chalcopyrite 2) Black streak
3) Pyrite 3) Greenish-black streak
4) Siderite 4) Cherry-red-streak.
a) 1-ii,2-iii,3-iv,4-i.
b) 1-iv,2-iii,3-ii,4-i.
c) 1-iii,2-i,3-iii,4-iv.
d) 1-i, 2-ii, 3-iii, 4-iv.
Answer. (b)
Q.7: Admantive lusture is shown by:
a) Calcite
b) Felspar
c) Sphalerite
d) Diamond
Answer. (d)
Q.8: When one mineral alters to another form in such a way that the Internal structure is
changed but the external form of the original crystal is retained, the specimen is called a:
a) Pseudomorph
b) Homeomorph
c) Iso-morphous
d) Iso-Structiral.
Answer. (a)
Q.9: When the form of a mineral is thread like, it is termed as:
a) Acicular
b) Filiform
c) Capillary
d) Dendritic
Answer. (b)
Q.10: The property of mineral by which it offers the resistance to breaking, crushing,
bending or tearing, is known as:
a) Parting
b) Fracture
c) Cleavage
d) Tenacity
Answer. (d)
Q.11: Litharge is an ore for the extraction of:
a) Copper
b) Antimony
c) Lead
d) Manganese
Answer. (c)
Q.12: Schillerization is shown by:
a) Plagoclarge
b) Angite
c) Hypersthene
d) Diamond
Answer. (c)
Q.13: Mark the correct statement:
a) The presence of the cleavage planes indicate the same strength of bonds between atoms in the
crystal.
b) The presence of the cleavage planes indicate the difference in strength of bonds between atoms
in the crystal.
c) For cleavage strength of bonds between atoms in the crystal is not responsible.
d) Both a) & c) are correct.
Answer. (b)
Q.14: Generally pyroxenes and Ampliboles show the
a) Pinacoidal Cleavage
b) Prismatic Cleavage
c) Octahedral Cleavage
d) Pyramidal Cleavage
Answer. (b)
Q.15: When a mineral breaks with curved concavities the fractured surface is known as:
a) Uneven
b) Even
C) Conchoidal
d) Hackly
Answer. (c)
Q.16: Which instrument is used to determine the accurate hardness of a mineral:
a) Scalerometer
b) X-ray spectrometer
c) Pycnometer
d) Electron microscope
Answer. (a)
Q.17: Presence of some elements in small amounts may cause the mineral to be deeply
coloured such elements are called:
a) Chromophore
b) Allochromatic
c) lndichromatic
d) None of these
Answer. (a)
Q.18: The property of development of electric charges on crystallized mineral by pressure is
called:
a) Pyro electricity
b) Piezo-electricity
c) Photo-electricity
d) None of there
Answer. (b)
Q.19: Which mineral shows pyro-electric property:
a) Quarts
b) Tonrmaline
c) Flvorite
d) Diamond
Answer. (a)
Q.20: Silicate crystals are generally:
a) lsotropic
b) Isodesimic
c) Mesodesmic
d) Anisodesmic
Answer. (c)
Q.21: Tekto-silicates are three-dimensional frame work of tetrahedral with:
a) All four oxygen atoms shared
b) Any Three oxygen atoms shared
c) Any two oxygen atoms shared.
d) lt is not certain
Answer. (a)
Q.22: Melilite is an example of:
a) Neso-silicate
b) Soro - silicate
c) Cyclo - silicate
d) lno – silicate
Answer. (b)
Q.23: Peridot is the gem-variety of:
a) Galena
b) Felspar
c) Olivine
d) Hyperstone
Answer. (c)
Q.24: The phase trans formation from Andalusite to kyanite is due to:
a) Thermal process
b) Mechanical process
c) Chemical process
d) Radioactive emission
Answer. (b)
Q.25 :Which silicate structure is found in garnets:
a) Neso-silicates
b) Soro-silicates
c) lno-silicates
d) Phyllosilicates
Answer. (a)
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