ONGC Quiz Petrology, Geology Test Paper
Geology Sample Question Paper for ONGC test
Q.1: Igneous rocks with high concentration of Mg and Fe are likely to have formed from
magmas originally derived from:
(a) SIAL.
(b) SIMA.
(c) MANTLE.
(d) Outer Core.
Answer. (c)
Q.2: At constant chemical composition, in the absence of volatiles, the melting temperature
shifts to:
(a) Lower temperatures at higher pressures.
(b) Higher temperatures at higher pressures.
(c) Higher temperatures at lower pressure.
(d) There is no change in melting temperature.
Answer. (b)
Q.3: The crystallization of magma is governed by the factor/factors:
(a) Temperature and pressure.
(b) Composition of magma.
(c) Viscosity of magma.
(d) All the above.
Answer. (d)
Q.4: The minerals that crystallise from a particular melt, and their sequence, depend entirely
upon the:
(a) Pressure only.
(b) Pressure and Temperature only.
(c) Pressure, Temperature and constituents concentration.
(d) Temperature and constituents concentration only.
Answer. (c)
Q.5: Early crystallised biotites and amphlboles can decomposed into fine aggregates of
felspars, pyroxenes and Fe-Tl oxides , because of:
(a) Water-deficient magma systems.
(b) Very high temperature in the system.
(c) Very high pressure in the system.
(d) Variable magma systems.
Answer. (a)
Q.6: At what ratio, the intergrowth of orthoclase and quartz minerals give a graphic texture:
(a) 48 : 68.
(b) 52.5 : 60.5.
(c) 65: 78.
(d) 72.5: 27.5.
Answer. (d)
Q.7: The temperature range, for which the Bowen’s Reaction series has been worked out is
from:
(a) 1200°c to 635°c.
(b) 1100°c to 450°C.
(c) 1100°C to 573°C.
(d) 900°C to 573°C.
Answer. (c)
Q.8: Phase diagrams are graphic devices illustrating equilibrium between:
(a) Temperature and pressure in the magma.
(b) Different phased and their compositions.
(c) Different compositions of the magma.
(d) Volalites saturation and composition of the magma.
Answer. (b)
Q.9: Forsterite and quartz react to form:
(a) Olivine.
(b) Oiopside.
(c) Ferrosilite.
(d) Enstatite.
Answer. (d)
Q.10: Pipes or narrow, funnel-shaped bodies filled with accidental and gas-charged juvenile
magmatic material are known as:
(a) Xenoliths.
(b) Diatrames.
(c) Mafurite.
(d) Dike.
Answer. (b)
Q.11: Zoned crystals are formed under the condition of:
(a) Rapid cooling
(b) Slow cooling
(c) Intermediate cooling
(d) Any rate of cooling
Answer. (c)
Q.12: lf a magma crystallises at a temperature of about 1500°C, its likely composition will be:
(a) Mafic.
(b) Felsic.
(c) Mixture of mafic and felsic.
(d) More felsic less mafic.
Answer. (a)
Q.13: Large crystals in pegmatite are formed due to:
(a) lnfluence of cooling rate.
(b) The presence of abundant volatiles in magma.
(c) Very high pressure.
(d) All the above.
Answer. (b)
Q.14: Rise of magma in shallow regions of the brittle crust is permitted by:
(a) Stoping and Assimilation.
(b) Diatreme formation.
(c) Uplift of roof rocks.
(d) All the above.
Answer. (d)
Q.15: CFBP stands for:
(a) Coal Fields Bio-product.
(b) Continental Flood Basal provision.
(c) Continental Frontal Basal platform.
(d) Chlorine Florine Bio-products.
Answer. (b)
Q.16: Deccan traps are predominantly tholeiitic characterised by:
(a) Higher Fe and Ti.
(b) Lower Fe and Ti.
(C) Higher AI and Ca.
(d) Higher Mg and Na.
Answer. (a)
Q.17: Which volcanic rock contains the lowest percentage of silica:
(a) Basalt
(b) Andesite.
(c) Trachyte.
(d) Rhyolite.
Answer. (a)
Q.18: Which volcanic rocks are characteristics of orogenic regions:
(a) Calc-volcanic rocks.
(b) Calc-Alkali volcanic rocks.
(c) Alkali-volcanic rocks.
(d) None of these.
Answer. (b)
Q.19: Pipe amygdales, commonly occur at the:
(a) Top of the flow.
(b) Middle of the flow.
(c) Base of the flow.
(d) Contact of two flows.
Answer. (c)
Q.20: The forms of the igneous bodies, depends upon:
(a) Mode of formation.
(b) Viscosity of magma.
(c) Nature of the country rocks.
(d) All the above.
Answer. (d)
Q.21: Stock, bosses and roof-pendants are related to:
(a) Dyke.
(b) Sill.
(c) Batholiths.
(d) Lopolith.
Answer. (c)
Q.22: Match the following:
I II
1. Laccolith. i. Saucer shaped intrusive body.
2. Lopolith. ii. Cressentric shaped igneous body
3. Bysmalith. iii. Convex top and flat bottom.
4. Phacolith iv. Broken intrusive body.
a) 1-iii, 2-i, 3-iv, 4-ii.
b) 1-ii, 2-i, 3-iv, 4-iii.
c) 1-i, 2-ii, 3-iii, 4-iv
d) 1-iv, 2-iii, 3-ii, 4-i
Answer. (a)
Q.23: Basaltic lavas can flow to greater distances because of:
a) High viscosity.
b) Low viscosity.
c) High temperature.
d) Low temperature.
Answer. (b)
Q.24: Myrmekite structure is produced by intergrowth of:
a) Quartz and plagioclase.
b) Quartz and orthoclase.
c) Plagioclase and Angite.
d) Albite and oligoclase.
Answer. (a)
Q.25: The Myrmekite structure is generally found in:
(a) Basaltic rocks.
(b) Granitic rocks.
(C) Diorite rock.
(d) Dunite rock.
Answer. (b)
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