MBOSE Class 12 Question Paper 2026 for Geology

FOR MBOSE CLASS 12 EXAM PREPARATION

MBOSE Class 12 2026
Question Paper ·
Geology
EXAM YEAR TYPE SUBJECT

MBOSE Class 12 2026 Question Paper Geology

Notes · Sample Papers · Previous Year Papers · Mock Tests

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Total No. of Printed Pages—9
HS/XII/Sc/Gl/26
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2026

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GEOLOGY
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a ( Theory )

Full Marks : 70

Time : 3 hours

The figures in the margin indicate full marks for the questions.
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General Instructions :
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(i) Write all the answers in the Answer
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(ii) Attempt Part—A (Objective Questions) serially.

(iii) Attempt all parts of a question together at one place.

( PART : A—OBJECTIVE )
( Marks : 35 )

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1. Choose and write the correct answer of any six of the
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following : 1×6=6
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las (a) Rudaceous rocks are rocks
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(ii) of the size of common sand

(iii) that are finer than common sand but coarser
than clay
/72 [ P.T.O.

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( 2 )

(b) In lamellibranchs with taxodont type of dentition,

(i) two distinct types of teeth can be recognized

(ii) the hinge line on either side of the valves
exhibits a number of more or less similar teeth
and sockets

(iii) the teeth are simple

(c) The Barail series comprises of

(i) Therria Stage, Sylhet Stage, Kopili Stage

(ii) Laisong Stage, Jenam Stage, Renji Stage

(iii) Bhuban Stage, Boka Bil Stage

(d) Marine organic animals give rise to

(i) coal

(ii) water

(iii) petroleum

(e) Organisms capable of swimming against a current
are said to be

(i) planktonic

(ii) nektonic

(iii) benthonic

HS/XII/Sc/Gl/26/72 [ Contd.

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( 3 )

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(f) Haematite is an ore of
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(i) aluminium .co s e m
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(ii) iron
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(iii)

(g) Acid rain is mainly caused due to

(i) open-cast mining

(ii) underground mining

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(iii) Neither (i) nor (ii)

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(h) Cavity filling falls under
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(i) magmatic concentration

(ii) evaporation

(iii) hydrothermal processes

2. State whether the following statements are True or False
(any six) : 1×6=6
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c. o(a) The term ‘fluvial’ is associated with river. m.co
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weathering is associated with

ag decomposition.

(c) Rudaceous rocks are non-clastic rocks.

(d) Moulds are hollows left within the rock beds.

HS/XII/Sc/Gl/26/72 [ P.T.O.

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( 4 )

(e) Jaintia Series comprises of three stages.

(f) The diamond pipes of South Africa is formed due to
magmatic dissemination, segregation and injection
respectively.

(g) Coal deposits of good quality are obtained in India
from the sedimentary formations of Lower Gondwana
age.

(h) A reservoir may fail as a result of rapid accumulation
of silt in it.

3. Fill in the blanks (any six) : 1×6=6

(a) Vibrations, both feeble and strong, set up on the
earth’s surface are described as _____.

(b) Gastropods show _____ coiling of the shell.

(c) Coal is a _____ deposit.

(d) The rocks of sedimentary origin occur in the form of
_____ or beds.

(e) The exact spot underneath the earth’s surface at
which an earthquake originates is known as its _____.

(f) In India, the Lower Gondwana rocks of the Permo-
Carboniferous age are characterized by the presence
of _____ flora.

HS/XII/Sc/Gl/26/72 [ Contd.

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( 5 )

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(g)
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_____ is the matching of rock layers based on their
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physical characteristics.
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(h) An _____ is an underground geological formation that
cang store and transmit groundwater.
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4. Express each of the following in 1 (one) word (any five) : 1×5=5

(a) The process of matching up of rock layers from
different locations to determine if they are of the same
age or have a similar stratigraphic position.
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(b) Organisms that are very useful in establishing the

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correct age of the rock beds in which they occur.
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(c) The line along which the fringes of a septum of a
cephalopod meet the inner side of the shell.

(d) The univalved shell that commonly consists of a
spirally coiled, elongated, tubular body looking more
or less like a screw.
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(e) Texture that is formed from the accumulation of rock
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fragments.

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transforming existing rocks under high temperature
and pressure.

(g) The minute spaces or holes through which liquid may
pass.

HS/XII/Sc/Gl/26/72 [ P.T.O.

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( 6 )

5. Match Column—A with Column—B and write the
corresponding numbers : 1×6=6

Column—A Column—B
(a) Bed load (i) Gondwana
(b) Placer (ii) Spiti
(c) Muth Quartzite (iii) Assam
(d) Glossopteris (iv) Deposition
(e) Conglomerate (v) Wet soil
(f) Landslides (vi) Mechanical
concentration
(vii) Rudaceous
(viii) Transportation

6. Write on the following in 1 (one) or 2 (two) line(s) (any six) :
1×6=6

(a) Pyrometasomatism

(b) Lamination

(c) Bituminous coal

(d) Gossan

(e) Radioactive mineral

(f) Permeability

(g) Non-clastic sediments

(h) Water table

HS/XII/Sc/Gl/26/72 [ Contd.

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( 7 )

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( PART : B—DESCRIPTIVE )
c. o ( Marks : 35 ) m .co
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Answer five questions, selecting one from each Group
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a GROUP—A
( Sedimentology )

7. Differentiate between disintegration and decomposition.
Write an explanatory note on lithification. 4+3=7

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8. Write short notes on any two of the following : 3½×2=7

(a) Argillaceous rocks . c
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(b) Concretions
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(c) Size of grains ag
9. Into how many categories the sedimentary environments
are classified? Write notes on any two of the marine
environment. 3+2+2=7

GROUP—B

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( Palaeontology )
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10. Outline the morphology of a typical gastropod shell with a

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neat labelled sketch. 6+1=7
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(a) Types of suture in cephalopods

(b) Glossopteris

(c) Morphology of a brachiopod

HS/XII/Sc/Gl/26/72 [ P.T.O.

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( 8 )

12. Define fossil. Explain briefly the different modes of
preservation of fossil. 1+6=7

GROUP—C
( Stratigraphy )

13. Outline the lithostratigraphy of Palaeozoic of Spiti in
tabular form. 7

14. Write short notes on any two of the following : 3½×2=7

(a) Upper Vindhyan

(b) Tipam Group

(c) Jaintia Group

15. Write briefly on the Pre-Cambrian of Dharwar Supergroup
of Karnataka. 7

GROUP—D
( Energy and Mineral Resources )

16. Explain the formation of economic minerals by magmatic
processes. 7

17. Write notes on any two of the following : 3½×2=7

(a) Mode of occurrence of petroleum

(b) Distribution of radioactive minerals in India

(c) Different types of coal

18. Give an account on the origin and distribution of bauxite
in India. 7

HS/XII/Sc/Gl/26/72 [ Contd.

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( 9 )

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( Engineering Geology, Groundwater, Environment
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19. Describe
construction of dams. 7

20. Write notes on any two of the following : 3½×2=7

(a) Occurrence of groundwater/aquifer

(b) Mitigation of landslides

(c) Effects of an earthquake
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21. What is an opencast mining? Describe .its impact on the
environment.
s em 1+6=7

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HS/XII/Sc/Gl/26/72 26K—70

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