MBOSE Class 12 Sample Question Paper 2027 Geology

FOR MEGHALAYA CLASS 12 PREPARATION

MBOSE Class 12
Sample Question Paper
2027 Geology
EXAM YEAR TYPE SUBJECT

Meghalaya Class 12 2027 Sample Paper Geology

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Sample Question Paper
Subject GEOLOGY
Class XII
Full Marks: 70 Time Allotted: 30

1. This question paper contains 34 questions. All questions are compulsory.
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2. This question paper is divided into five sections-sections A, B, C, D and E.

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3. Section A - Questions No 1 to 16 are Multiple Choice Type Questions carrying 1 mark
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each.
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4. Section B - Questions number 17 to 22 are very short answer type questions carrying 2
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marks each.
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5. Section C - Questions number 23 to 26 are short Answer (SA) Type questions carrying 3
marks each.
6. Section D - questions number 27 to 29 are long Answers (LA) type questions carrying 4
marks each.
7. Section E- Question number 30 to 32 is are long Answers (LA) type questions carrying 6
marks each.
8. There is no overall choice given in the question paper. However, an internal choice has
been provided in a few questions.
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Q. Marks
No.
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Section

Choose and write the correct answer 1x16=16
1. An example of an argillaceous rock is 1
a) Sandstone
b) Clay
c) Fine sandstone
d) Mudstone

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2 Which process is NOT involved in the formation of sedimentary rocks?
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a) Weathering
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b) Consolidation
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your answer as per the codes provided below.
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Assertion (A): Sedimentary rocks are called primary rocks.
Reason (R): Sediments are compressed and hardened to form sedimentary
rocks.
a) Both (A) and (R) are true but (R) is not the correct explanation of
(A)
b) Both (A) and (R) are true and (R) is the correct explanation of (A)

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Page 1 of 8

c) (A) is true but (R) is false
d) (A) is false but (R) is true.
4 1

The above picture is of_________
a) Lamellibranch
b) Gastropod
c) Cephalopod
d) Brachiopod
The following question is for visually impaired candidates in lieu of 1
Question No. 4.
Mollusks typically with a single, often coiled shell are known as_______
a) Lamellibranch
b) Gastropod
c) Cephalopod
d) Brachiopod
5 The hinge of the Lamellibranchia posterior to the beak is called the 1
a) Adductor Impression
b) Lunule
c) Escutcheon
d) Cardinal Area
6 Match the following: 1
List I List II
A. Petrification i. A thin, dark layer of carbon left
behind by compressed leaves or fish
B. B. Mold ii. An empty cavity in a rock that shows
the exact shape of an organism.
C. C. Cast iii. Organic material is completely
replaced by minerals like silica or
calcite.
D. Carbonization iv. Minerals fill an empty cavity to
create a 3D replica of the organism.

Options:
a) A-ii, B-iii, C-i, D-iv

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b) A-iii, B-ii, C-iv, D-i
c) A-iv, B-i, C-iii, D-ii
d) A-i, B-iii, C-ii, D-iv
7 Vertebraria has similar appearance as 1
a) Animal teeth
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b) Animal vertebral column

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c) Animal hoops
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d) Animal antlers
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You observe a stack of undisturbed sedimentary rock layers. According to
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the principle of superposition, where would you expect to find the oldest
fossils?
a) In the top layer
b) In the middle layer
c) In the bottom layer
d) Scattered randomly throughout all layers
9 The Correct sequence from older to younger in the Tertiary rocks of Upper 1
Assam is:
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a) Barail – Surma – Tipam – Dupitila – Dihing
b) Dihing – Dupitila – Tipam – Surma
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c) Barail – Dupitila – Surma – Tipam m
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d) Barail – Tipam – Surma – Dupitila
ag deposits mined in Cherrapunji and
10 The massive commercial limestone 1
Jaintia Hills belong to which stratigraphic unit?
a) Surma Group
b) Shillong Group
c) Shella Formation (Jaintia Group)
d) Sylhet Traps

11 Match List I with List II
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List II
.c A. galena i. aluminium
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l a E. C. magnetite iii. lead
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Options:
iv. iron

a) A-ii, B-iii. C-i, D-iv
b) A-i, B-ii. C-iv, D-iii
c) A-iii, B-ii. C-iv, D-i
d) A-iii, B-i. C-iv, D-ii

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12 There are two statements marked as Assertion (A) and Reason (R). mark 1
your answer as per the codes provided below.
Assertion (A): Mica is a non-metallic mineral.
Reason (R): Mica mineral is the basic raw material for cement industry
a) Both (A) and (R) are true but (R) is not the correct explanation of
(A)
b) Both (A) and (R) are true and (R) is the correct explanation of (A)
c) (A) is true but (R) is false
d) (A) is false but (R) is true.
13 Which of the following is not an abiotic component of the 1
environment?
a) River
b) Rocks
c) Microbes
d) Sunlight.
14 Rain, snow, sleet, and hail are all forms of: 1
a) Evaporation
b) Infiltration
c) Precipitation
d) Transpiration
15 What is the most important geological consideration before constructing a 1
dam?
a) Soil fertility
b) Rock type and structure
c) Surface vegetation
d) Proximity to roads

16 1

In the above diagram, region A is the _______.
a) discharge zone
b) recharge zone
c) saturated zone
d) unsaturated zone
The following question is for visually impaired candidates in lieu of 1

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Question No. 16.
The infiltration of water into the subsurface is the __________ .
a) influent
b) effluent

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c) discharge
d) recharge
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Section B 2x6=12
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17 Differentiate between clastic and non-clastic rocks.
l is diagenesis? How is it different from metamorphosis?
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18 What 1+1
19 ‘Gondwana flora served as key fossil evidence for continental drift’. 2
How did Gondwana flora fossils help prove the theory of Continental
Drift?
20 Mention any two uses of stratigraphic studies. 1+1
21 A) Name two fossils found in the Triassic rocks of Spiti. 1+1
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B) Which is the oldest oilfield in India? Oil in this oil field is found in 1+1

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agporosity but very low permeability?
which formation?
22 A) Why does clay have high 2
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B) What are aquifers? What are characteristics that make a rock a good
aquifer?
2

Section C
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3x4=12
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preservation of fossils.

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classification.
1+2

24 Write a short note on palaeontologic correlation. 3
25 A) Which country has the largest reserves of Thorium in the world? 1+1+1
Name its ore. Name one thorium reserve found in India?

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Or
B) What is a "Cap Rock" or "Seal" in a petroleum system? Give two
examples.
26 A) An important mineral has been identified in your district. Which 3
mining method would you suggest - open cast mining or
underground mining? Give atleast three reasons to justify your
choice.
Or
B) What three remedial measures would you suggest to mitigate 3
landslides?
Section D 4x3=12
27 A) The Jaintia Group belongs to which Era/Age? Name the Formations 1+ 3
and the dominant rock types within this Group.
Or
B) Compare Glossopteris and Gangamopteris.
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28 A) List any four non-conventional energy sources. Describe any one of 2+2
them.
Or
B) With the help of schematic diagram, describe cross bedding and
graded bedding. 2+2

29

Based on the illustrated picture of earthquake, answer the following
questions:
i. Which is the point of origin of the earthquake- x, y or z? What 1
is it known as?
ii. What is point z known as? 1
2

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iii. What is point y known as? Define it.

The following question are for visually impaired candidates in lieu of 1x4=4
question No. 29.
Answer the following question:
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i. Name the point inside the Earth where an earthquake originates.
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ii. Name the point on the Earth's surface directly above the point where
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an earthquake originates.
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iii. What is the name of the scale used to measure the magnitude of an
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iv. What is the term for a large crack in the Earth's crust where
earthquakes occur?

Section E 6x3=18
30 A) Give a classification of sedimentary environments of deposition, 4+2
including the main sub-environments. Write notes on any one of the
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sub- environments.

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Add brief petrographic g lasofoftheupper
B) Write the Tertiary stratigraphy Assam in tabular form.
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a notes rock unit.

31 A) Outline the morphology of a typical gastropod shell. Draw a neat 6
labeled sketch.
Or
B) i. What are fossils? 1
ii. What is the study of fossils known as?
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iii. Describe body fossil and trace fossil with suitable examples.
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32 A) Give an account of origin and distribution of Bauxite in India 6

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B) As an intern in a construction company, you have been asked to assist
in choosing a site for dam construction in a river. Describe the
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geological considerations that you will take into account in selecting the
site. Give reasons for the same.

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Blueprint
Geology Sample Paper
Class XII
Units Unit Name Marks MCQ SA-I SA-II LA-1 LA-II
alloted 1x16=16 2x6=12 3x4=12 4x3=12 6x3=12
I Sedimentology 13 1(3) 2(2) 3( ) 4( ) 6(1) 13 (6)

II Palaeontology 15 1(4) 2(1) 3 (1) 4( ) 6(1) 15 (7)
6( )
III Stratigraphy 14 1(3) 2(2) 3 (1) 4 (1) 6( ) 14 (7)

IV Mineral and Energy 15 1(2) 2( ) 3 (1) 4 (1) 6 (1) 15 (5)
Resources 3( )
V Engineering Geology 13 1(4) 2(1) 3 (1) 4 (1) 6( ) 13 (7)
3( )
70 16(16) 12(6) 12(4) 12(3) 18(3) 70 (32)

Figures within brackets to indicate the number of questions and figures outside the brackets to indicate marks.

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