MBOSE Class 11 Question Paper 2022 for Geology

Total No. of Printed Pages ––10 (2)
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(b) Inorganic natural substances with well developed
geometric forms are called
2022
(i) minerals
GEOLOGY
(ii) crystals
( THEORY )
(iii) rocks
Full Marks : 70

Time : 3 hours (c) The first mineral to crystallize from a basaltic
magma is
The figures in the margin indicate full marks for the questions
(i) Quartz
General Instructions:
(ii) Feldspar
(i) Write all the answers in the Answer Script.
(iii) Olivine
(ii) Attempt Part–A Objective Questions serially.

(iii) Attempt all parts of a question together at one place. (d) Temperature and directed pressure dominating
metamorphism is called

( PART : A–OBJECTIVE ) (i) contact metamorphisim
(ii) cataclastic metamorphism
( Marks : 35 )
(iii) regional metamorphism
1. Choose and write the correct answer (any 6) : 1  6=6
(a) The study of the action of natural agents on the (e) The line of greatest curvature of a fold is called
earth’s surface giving rise to characteristic the
lanforms is
(i) limb
(i) Physical geology
(ii) hinge
(ii) Seismology
(iii) fold axis
(iii) Isostasy

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(3) (4)

(f) The sum total effect of disintegration and 2. State ‘True’ or ‘False’ (any six): 1  6=6
decomposition of rocks is called
(a) A seismic record is called a seismograph.
(i) degradation
(b) There are 7 crystal systems.
(ii) aggradation
(c) In normal slip faults, the hanging wall goes down
(iii) weathering relative to the footwall.

(d) Mineral grains too small to be discovered
even under the microscope are said to be
(g) Mafic igneous rocks contain
microcrystalline.
(i) Olivine, pyroxene
(e) Sillimanite is observed in very high grade
(ii) biotite, quartz metamorphic rocks.

(iii) quartz, K-feldspar (f) P-and S-waves create the destruction on the
earth’s surface during an earthquake.

(g) The hanging wall goes up relative to the footwall
(h) An acidic oversaturated igneous rock with more in reverse slip faults.
than 66% silica is
(h) An octahedron is made up of eight square faces.
(i) gabbro
(i) Earthquakes originate due to faulting in the
(ii) dunite
earth’s interior.
(iii) granite

3. Fill in the blanks (any six) : 1  6=6
(i) Folds with oldest rock in its core/centre are called (a) Paleocene is an example of a/an ________ of
(i) antiforms geological time scale.

(ii) synforms (b) Minute solid particles in space which
ultimately gave rise to the solar system are
(iii) anticlines called _______.

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(5) (6)

(c) A qualitative expression of the scale of an (f) Inclination of a rock layer.
earthquake is called earthquake _______.
(g) Folds that are convex downwards.
(d) The phenomenon of an incident light breaking
up into two refracted rays is called _______.

(e) The _______ passes through successive hinges in 5. Match Column A with Column B and write the
corresponding numbers : 1  6=6
a stack of folded surfaces.

(f) Country rocks taken in by invading magma is Column A Column B
called _______.
(a) Pleochroism (i) continuous reactions
(g) The term ‘blastic’ or ‘blast’ is used to denote
(b) Attrition (ii) simultaneous
_______ rock texture.
crystallization
(h) When an oceanic plate collides with a continental (c) River (iii) prism
plate, it is the _______ plate that sinks into the
(d) Solid solution (iv) mineral color change
mantle.
(e) Eutectic (v) discontinuous reaction
(i) Light vibrating along one plane is called _______
of light. (f) Tetragonal (vi) cube
(vii) point bar

4. Express the following in one word (any five) : 1  5=5 (viii) breakdown by mutual
collision
(a) One single parental magma giving rise to many
kinds of igneous rocks.
6. Answer in 1 (one) or 2 (two) lines (any six) : 1  6=6
(b) Color of the powder of minerals.
(a) Strike of rocks
(c) Fracture accompanied by displacement.
(b) Plane of symmetry
(d) Zig-zag path of a river. (c) Sill

(e) A hot mobile melt. (d) Lustre of mineral

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(7) (8)

(e) Subhedral grains 9. Write brief notes on the common depositional features
associated with a river. 7
(f) Hydraulic action

(g) Metasomatism GROUP – B
(h) Plastic deformation ( Crystallography and Mineralogy )

(i) Batholith
10. List the symmetry elements of the normal class of the
tetragonal system. Draw a clinographic sketch of the
tetragonal system. List the forms developed. Name a
( PART : B–DESCRIPTIVE ) mineral crystallizing in the tetragonal system.
1½ + 1 + 4 +½ = 7
( Marks : 35 ) Or
11. Writes notes on any two of the followings: 3½ x 2 = 7
(a) Extinction
GROUP – A
(b) Isotropism and anisotropism
( General Geology )
(c) Double refraction

Or
7. Explain the types of earthquake waves. Explain the
tectonic cause of earthquake. 3½ + 3½ = 7 12. Write brief notes on the various physical properties of
minerals. 7
Or

8. Answer any two of the following : 3½ x 2 = 7 GROUP – C
(a) Origin of the earth.
( Structural Geology and Geotectonics )
(b) Geological time scale in tabular form.
13. List and explain four elements of folds. Distinguish
(c) Weathering and erosion an antiform from an anticline. Write a note on
asymmetrical folds. 4+1+2=7
Or Or

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(9) ( 10 )

14. Write notes on any two of the following: 3½ x 2 = 7 GROUP – E

(a) Dip and strike. ( Metamorphic Petrology )

(b) Types of dip-slip faults. 19. List the agents of metamorphism and explain how they
(c) Plate boundaries. bring about changes in pre-existing rocks. 7
Or
Or
20. Answer any two of the following : 3½ x 2 = 7
15. Define ‘plate’ in plate tectonics. Explain the concept
of plate tectonics. 2+5=7 (a) Grade of metamorphism
(b) Gneiss

GROUP – D (c) Regional metamorphism

( Igneous Petrology ) Or
21. Write brief notes on any six metamorphic rock
structures/textures. Draw neat sketches. 6+1=7
16. What is magmatic differentiation? List the processes
of differentiation. Write in detail on any one of them.
1+2+4=7
Or

17. Answer any two of the following : 3½ x 2 = 7

(a) Continuous reaction series.

(b) Inequigranular igneous texture.

(c) Magma and its composition.

Or

18. Write brief notes on six extrusive igneous rock
structures. Draw sketches. 6+1=7

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