MBOSE Class 12 Question Paper 2024 for Geology

Meghalaya Board of School Education

QUESTION
PAPERS

Total No. of Printed Pages—8
HS/XII/Sc/Gl/24

2024

GEOLOGY

( Theory )

Full Marks : 70

Time : 3 hours

The figures in the margin indicate full marks for the questions

General Instructions :

(i) Write all the answers in the Answer Script.

(ii) Attempt Part—A (Objective Questions) serially.

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

( PART : A—OBJECTIVE )
( Marks : 35 )

1. Choose and write the correct answer of any six of the
following : 1×6=6

(a) Very thin rock layers are called

(i) bed

(ii) strata

(iii) laminae

/32 [ P.T.O.

( 2 )

(b) The term ‘apical angle’ is associated with
(i) Lamellibranch
(ii) Gastropod
(iii) Cephalopod

(c) The correct sequence of the following three
formations from older to younger is
(i) Barail, Surma, Tipam
(ii) Surma, Tipam, Barail
(iii) Surma, Barail, Tipam

(d) Diamond, platinum, magnetite and chromite deposits
are associated with
(i) magmatic processes
(ii) sedimentary processes
(iii) metamorphic processes

(e) The rocks on the sides of a dam constitute its
(i) foundation
(ii) abutment
(iii) reservoir

(f) Trilobite fossils in India are found in the
(i) Vindhyan Supergroup
(ii) Paleozoic of Spiti
(iii) Tertiaries of Assam

HS/XII/Sc/Gl/24/32 [ Contd.

( 3 )

(g) Lamellibranchs are generally
(i) free-swimming
(ii) bottom dwelling in the shallow seas
(iii) bottom dwelling in the deep seas
(h) An example of an argillaceous rock is
(i) sandstone
(ii) fine sandstone
(iii) mudstone

2. State whether the following statements are ‘True’
or ‘False’ (any six) : 1×6=6
(a) Bedding planes must dip upstream under a dam to
make it stable.
(b) The impressions left by adductor muscles on the
inner side of lamellibranchs are called ligaments.
(c) The most common sedimentary structure is bedding.
(d) The deposits developed as a result of mechanical
concentration are called sedimentary economic
deposits.
(e) Cutting off the toe of a hillslope increases the risk of
landslides.
(f) The Khasi Group is of Cretaceous Age.
(g) Petroleum traps are formed because such rocks are
overlain by a porous and permeable rock called cap
rocks.
(h) It is better if seepage from a reservoir happens
towards the upstream side.

HS/XII/Sc/Gl/24/32 [ P.T.O.

( 4 )

3. Fill in the blanks (any six) : 1×6=6
(a) Beach placers in Kerala contain _____ mineral
deposits.
(b) The Basal conglomerate and the _____ limestones
together constitute the Basal formation of the
Vindhyan Supergroup.
(c) Dams are constructed over _____ river valleys.
(d) The hinge area of a lamellibranch is labelled as
lunule and _____.
(e) The economic mineral deposits associated with the
water table are called _____ deposits.
(f) The chief cause of landslide is _____.
(g) The equivalency of rocks of two different sections is
called _____.
(h) Coal deposits of North-East India are generally rich
in the element _____.

4. Express each of the following lines in 1 (one) word (any
five) : 1×5=5
(a) A group of related formations and/or groups
(b) Wavy features in rocks
(c) The study of ancient life-forms, specifically plants
(d) Mineral deposits formed at the same time as the
enclosing rock
(e) An opening in a dam lets the excess water in the
reservoir flow out
(f) The fossil leaves an imprint on the enclosing rock

HS/XII/Sc/Gl/24/32 [ Contd.

( 5 )

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

Column—A Column—B
(a) Cross-beds (i) Pore-fluid pressure
(b) Kopili shale (ii) Nummulites
(c) Dharwar (iii) Last and largest
(d) Landslides (iv) Wavy features
(e) Body chamber (v) Trilobites
(f) Haimanta (vi) First and largest
(vii) Good drainage of water
(viii) Iron ore deposits
(ix) Forest

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

(a) Lithostratigraphy

(b) Mitigation

(c) Disintegration

(d) Umbo

(e) Primary mineral deposits

(f) Porosity

(g) Disaster

(h) Suture

HS/XII/Sc/Gl/24/32 [ P.T.O.

( 6 )

( PART : B—DESCRIPTIVE )
( Marks : 35 )

Answer five questions, selecting one from each Group

GROUP—A
( Sedimentology )

7. State the four modes of sediment transport. How do
non-clastic rocks form? Write an explanatory note on
diagenesis. 2+2+3=7

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

(a) Load casts

(b) Shape of grains

(c) Rudaceous rocks

9. Give a classification of sedimentary environments of
deposition, including the main sub-environments. Write
notes on any two of the sub-environments. 2+5=7

GROUP—B
( Paleontology )

10. Outline the morphology of a typical cephalopod shell with
a neat labelled sketch. 7

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

(a) Dentition in lamellibranchs

HS/XII/Sc/Gl/24/32 [ Contd.

( 7 )

(b) Difference between brachiopod and lamellibranch
shell

(c) Types of sutures in cephalopods

12. Write a brief note on the scope and uses of paleontology. 7

GROUP—C
( Stratigraphy )

13. Outline the lithostratigraphy of Meghalaya. 7

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

(a) Haimanta Supergroup

(b) Tipam Group

(c) Paleontologic Correlation

15. Explain the procedures for correlation of rocks in
stratigraphy. 7

GROUP—D
( Energy and Mineral Resources )

16. Write an account of the origin of coal. 7

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

(a) Late magmatic deposits

(b) Placer deposits

(c) Importance of mineral resources

18. Write brief notes on the ore minerals, mode of occurrence
and distribution of iron ore deposits in India. 7

HS/XII/Sc/Gl/24/32 [ P.T.O.

( 8 )

GROUP—E
( Engineering Geology, Groundwater, Environment
and Disaster Studies )

19. How do bedding planes of stratified rock affect the
stability of a dam? Draw neat sketches to supplement
your answer. 7

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

(a) Porosity versus Permeability

(b) Impact of underground mining

(c) Effects of earthquake

21. Write an essay on the hydrologic cycle. 7

HHH

HS/XII/Sc/Gl/24/32 24K—70

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