AHSEC| CLASS 12| GEOLOGY| QUESTION PAPER - 2020| H.S. 2ND YEAR
2020
GEOLOGY
(Theory)
Full Marks: 70
Pass Marks: 21
Time: Three hours
The figures in the margin indicate
full marks for the questions.
1. Answer the following selecting the correct option given below: 1x8=8
(a) _______ is a
metamorphic rock.
(i) Mari
(ii) Slate
(iii) Basalt
(b) When in an
igneous rock Si02 is less than 45%, it is called ________.
(i) ultrabasic
rock
(ii) basic rock
(iii) acidic
rock
(c) Very coarse-grained
sedimentary rocks are called as ______.
(i) Rudaceous
(ii) Arenaceous
(iii)
Argillaceous
(d) Tipam group
belongs to ________.
(i) Quarternary
period
(ii) Tertiary
period
(iii) Gondwana
supergroup
(e) ________is
an ore of Mangaese.
(i) Hernatite
(ii) Chalcopyrite
(iii)
Psilomelane
(f) Coal is a
_______.
(i) rock
(ii) mineral
(iii) crystal
(g) Permeability
is maximum in _________.
(i) Sand
(ii) Silt
(iii) Gravel
(h) Turritella
is a _______.
(i) Brachiopoda
(ii) Gastropoda
(iii)
Lamellibranchia
2. Write on the following in two or three sentences
each: 2x10=20
(a) Conglomerate
(b) Extrusive
rock
(c) Ripple marks
(d) Pillow
structure
(e) Surma group
(f) Tura
formation
(g) Placer
deposit
(h) Accumulation
of petroleum
(i) Dam
(j) Petrification.
3. Write short notes on the following: 3x9=27
(a) Equigranular
texture
(b) Batholith
(c) Clastic texture
of sedimentary rock
(d) Upper
Dharwar formation
(e) Gondwana
Supergroup
(f) Occurrence
of Limestone in NE India
(g) Water table
(h) Porosity
(i) Shap of the
Brachiopoda Shell.
4. Describe any three of the following: 5x3=15
(a) Regional
metamorphism
(b) Precambrian
rocks of Karnataka
(c) Origin of
Petroleum
(d) Hydrological
cycle
(e) Mode of preservation
of fossils.
***
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