Geology, Earth Science Sample Paper
Petrology Practice Test
Q.1: The Formation of pillow lava indicates:
(a) Free eruption.
(b) Continental eruption.
(c) Sub-marine eruption.
(d) None of these.
Answer. (c)
Q.2: Alteration of volcanic rocks come about more or less automatically, the
alteration is called:
(a) Propylitic alteration.
(b) Hydrothermal alteration.
(c) Deuteric alteration.
(d) None of the above.
Answer. (c)
Q.3: Match the columns:
I II
1. Panidiomorphic. i. Crystals subhedral. _
2. Hypidiomorphic. ii. Crystals are anhedral.
3. Allotriomorphic. iii. Crystals are euhedral.
4. Glassy iv. No crystallisation at all.
(a) 1-ii, 2-iii, 3-i, 4-iv.
(b) 1-i, 2-ii, 3-iii, 4-iv.
(c) 1-iv, 2-iii, 3-ii, 4-i.
(d) 1-iii, 2-i, 3-ii, 4- iv.
Answer. (d)
Q.4: Trondhjemite is a:
(a) Quartz diorite.
(b) Quartz dumite.
(c) Plagioclase granite.
(d) Felspar diorite.
Answer. (a)
Q.5: Most of the mountain ranges of past geological times, show cores of:
(a) Granitic types.
(b) Granodioritic types.
(c) Dioritic types.
(d) Basaltic types.
Answer. (b)
Q.6: Rock containing enstatite and hypersthene along with plagioclases is called:
(a) Anorthosite.
(b) Monzonite.
(c) Norite
(d) Lamprophyre.
Answer. (c)
Q.7: Match the following:
I ll
1. Granite. i Dacite.
2. Granodiorite. ii. Andesite.
3. Syenite. iii. Rhyolite.
4. Diorite iv. Trachyte.
(a) 1-iii, 2-i, 3-iv, 4-ii.
(b) 1-i, 2-ii, 3-iii, 4-iv.
(c) 1-iii, 2-i, 3-ii, 4-iv.
(d) 1-iv, 2-i, 3-ii, 4- ii.
Answer. (a)
Q.8: Syenite with alkali feldspar and plagioclase in almost equal amount is called:
(a) Norite.
(b) Kimberlite.
(c) Peridotite.
(d) Monozonite.
Answer. (d)
Q.9: What coarse-grained (plutonic) rock consists of abundant calcic plagioclase
pyroxene and ollvine:
(a) Syenit.
(b) Lamprophyre
(c) Peridotite.
(d) Gabbro.
Answer. (d)
Q.10: Kimberlite is a variety of:
(a) Dumile.
b) Pyroxerlite.
c) Peridotite
d) Syenite.
Answer. (c)
Q. 11: Ultrabasic basalt rich in olivine is called
(a) Oceanite.
(b) Klmberlite.
(c) Norite
(d) ljolite.
Answer. (a)
Q.12: Ultrabasic and eclogite xenoliths from mantle sources are found in:
(a) Panna Kimberlites.
(b) Wajrakaru Kimberlites.
(c) Kishangarh Nepheline Syenites.
(d) Dongargarh Granites.
Answer. (b)
Q.13: Mark the correct order of stages of cooling and crystallisation of a magma:
(a) Orthomagmatic, Pneumatolylic, Hydrothermal and pegmatitic
(b) Pegmatitic, Pneumatolytic, Orthomagmatic and Hydrothermal.
(c) Orthomagmatic, Pegmatitic, Pneumatolytic and Hydrothermal.
(d) Hydrothermal, Pegmatitic, Orthomagmatic and Pneumatolytic.
Answer. (c)
Q.14: When the active solutions are directly of magmatic origin, all changes in mineral
composition or in texture produced by them are termed:
(a) Eutectic.
(b) Deuteric.
(c) Metasomatic.
(d) Hydatogenetic.
Answer. (b)
Q.15: The Three most abundant types of sedimentary rocks in order
of decrease abundance are:
(a) Sandstone, Limestone and mud stone.
(b) Sandstone, mudstone and Limestone.
(c) Limestone, sandstone and mudstone.
(d) Mudstone, sandstone and limestone.
ANSWER: (d)
Q.16: Absence of bedding in a sedimentary deposit may be due to:
(a) The rate of accumulation m have been too rapid for sorting.
(b) The materials supplied may have been too uniform in character.
(c) Slumping of the materials after their deposition may have destroyed
on original bedded structures.
(d) All the above.
ANSWER: (d)
Q.17: A sedimentary layer whose 'thickness Is less than one centimeter, is known as:
(a) Stratum.
(b) Lamina.
(c) Verve.
(d) None of these.
ANSWER: (b)
Q.18: Plane beds formed under high current Velocity conditions have:
(a) No surface irregularities large in amplitude.
(b) Surface irregularities large in amplitude.
(c) Surface irregularities small in amplitude.
(d) Very narrow irregularities.
ANSWER: (a)
Q.19 Antidotes are formed due to:
(a) Downstream motion of the sediments against the current flow.
(b) Upstream motion of the sediments against the current flow.
(c) Very high velocity of the current flow.
(d) None of these.
ANSWER: (b)
Q.20: In the climbing ripple lamination the angle of climb is commonly between:
(a) 1 and 5 degree from the horizontal.
(b) 5 and 10 degrees from the horizontal.
(C) 5 and 20 degrees from the horizontal.
(d) 10 and 30 degrees from the horizontal.
ANSWER: (c)
Q.21: The formation of ripples on sand and silt surfaces alternates with stacker water
deposition of finer mud, a structure is produced known as:
(a) Tabular bedding.
(b) Ventricular bedding.
(c) False bedding.
(d) Falser bedding.
ANSWER: (d)
Q.22: Ripple marks are developed under:
(a) Deep water conditions.
(b) Shallow water conditions.
(c) Both deep and shallow water conditions.
(d) Very deep water conditions.
ANSWER: (b)
Q.23: Asymmetrical current ripple marks are formed due to:
(a) Wave action.
(b) Current action.
(C) Both wave and current actions.
(d) Combined action of wave and current action.
ANSWER: (b)
Q.24: A current bedding in which horizontal beds are made up of fine materials occuring
alternately with coarse deposits, is called:
(a) Tabular bedding.
(b) Lenticular bedding.
(c) False bedding.
(d) Torrential bedding.
ANSWER: (d)
Q.25: Rain prints can occur in:
(a) Igneous rocks only.
(b) Sedimentary rocks only.
(c) Metamorphic rocks only.
(d) All the above.
ANSWER: (b)
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