Karnataka 2nd PUC Question Paper 2026 Answer Key Geology

2026 II PUC EXAM – 1 KSEAB 37 - GEOLOGY
KARNATAKA SCHOOL EXAMINATION AND ASSESSMENT BOARD
2026 II PUC EXAM-1

SUBJECT: 37 - GEOLOGY SCHEME OF EVALUATION MAX MARKS: 80
Q. NO. ANSWER MARKS
I.
1. b. Granulose 1
2. c. Clay-Silt-Sand-Gravel 1
3. b. Igneous and sedimentary rock 1
4. d.To open the shell 1
5. c. Strike and Dip 1
II.
6. Mesozoic 1
7. Graben 1
8. Carbonisation 1
9. Pumice 1
10. Shape and distortion 1
III.
11. ii. Gastropod 1
v. Non-clastic 1
i.Visible Life 1
vi. Plutonic rock 1
iii. Tertiary rock 1
IV.
12. Aggregate of minerals 1
13. Angle of inclination with horizontal plane 1
14. Crystal cannot be observed under microscope 1
15. 0.1 mm to 2.00 mm 1
16. Concave upward or convex downward 1
IV.
17. Igneous, sedimentary and metamorphic 2
18. Euherdral , subhedral and unhedral 2
- Lava with low viscosity, Basic composition- 1
19. - Appears like rope- 1 2

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2026 II PUC EXAM – 1 KSEAB 37 - GEOLOGY
- High viscosity -1
20. 2
- More silica – 1
- Arrangement of edimentary bed in layers one above the other. – 1

21. 2

- -1
- Undulations on sediment surface -1
22. 2
- Asymmetrical , Symmetrical -1
- water is most important solvent – 1
23. 2
- Formation of new mmineral – 1
- Feldspar – 1
24. 2
- Quartz – 1
- Block above the fault – 1

26. 2

- -1
- Hard parts – 1
27. 2
- Into silica replacement- 1
- Impressions of movements of animals.
28. - Soft mud/ sandy bottom. 2
- Pseudo fossil
VI.
- Forms in homogenous magma body. - 1
29. - Uniform cooling and consolidation of magma.-1 3
- Produce columns. Joints in the form of polygonal shape - 1
- Natural resources; Minerals; Petroleum
- History of the Earth
30. - Building material 3
- Road material
- Decorative purpose
- Clastic/mechanically formed. Definition- 1
31. -Residual. Definition- 1 3
- Non- clastic definition- 1
- Pre existing rock/parent rock that are buried, undergo change.-1
32. -Influence of temperature, pressure and chemically active fluids 3
- Example: Any metamorphic rock.-2
- To measure attitude of beds.
33. 3
-Geological Mapping

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2026 II PUC EXAM – 1 KSEAB 37 - GEOLOGY
-Locate ourselves in field.
- Slope measurement (any three)
- Hanging wall moved upward w.r.t. footwall. -1

34. 3

- -2
- Indicate wearer zone
- Cause natural disaster
35. - Holds mineralized zone. 3
- Source of petroleum.
- Causes seepage into aquifer. (any three)
- Undisturbed horizontal sequence.
- Rocks at the bottom are older than overlying.
- Basic tool to understand geological history. – 2
36. 3

- -1

37. 3

-
i. Calyx : Depression in the coni of coral. - 1
38. ii. Tabulae: Horizontal plates crosses septa. – 1 3
iii. Theca: Outer wall of the corallum. – 1
VII.
- Extrusive: Consolidation of magma on the earth. -1
Lava flow. – 1
-Intrusive : Consolidation of magma inside the earth. -1
> Concordant : Parallel to bedding.
39. 5
Sill. -1
➢ Discordant: Cut across the bedding plane.
Dyke. -1

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2026 II PUC EXAM – 1 KSEAB 37 - GEOLOGY
Pegmatite:
- Hypabassal
- Felsic
- Quartz, Feldspar, Mica
- Intergrowth texture. --2
40. Granite: 5
- Plutonic
- Felsic
- Medium Sp Gravity
- Qtz, Feldspar, Mica
- Hypidiomorphic texture. –3
Epizone:
- Near surface
- <300°C
- Dynamic metamorphism
- Slate/ Chlorite schist --1
Mesozone:
- Mid zone
41. - 300°C – 550°C 5
- Dynamothermal
- Biotite/Garnet Schist--2
Hypozone:
- Great depth
- 550°C-1200°C
- Plutonic metamorphism
- Granulite/Eclogite –2
i. Angular Unconformity
- Older angular sequence.
- Horizontal/ Inclined younger sequence.—1
ii. Disconformity
- Parallel unconformity
42. 5
- Older and younger formation remains horizontal.—2
iii. Non Conformity
- Younger rocks over older igneous rocks.
- It may be between Ig – Sed/ Ig- Met
- Igneous unconformity—2
- Hinge: Line of maximum curvature.
- Limb: bends situated on either side of fold.
43. -Plunge: Angle of inclination w.r.t. horizontal plane. 5
- Crest: Highest point- Trough: Lowest point
-Axial Plane: Line of intersection of axial plane with bedding plane. ----3
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2026 II PUC EXAM – 1 KSEAB 37 - GEOLOGY

---2
- Upper Chloritic Division
> Chlorite schist, Calc granulite
> Hematite, Quartzite
> Marble, Conglomerate---- 2
44. 5
- Lower Hornblend Division
> Hornblend schist, Gneiss
> Greenstone
> Dyke and lava flow ----3
Morphology:
- Bivalved(dorsal/ventral), umbo
- Pedical opening; Inequivalved; Equilateral
Hinge; Hinge line; Hinge area.
45. 5
- Divericators; Adductors
- Concentric growth lines----4
- Time range:
- Palaeozoic and Mesozoic; Silurian – maximum; Devonian- Decline…1
Index fossil: Wide geographic distribution; Short geologica range-2
46. Conditions: a. Possession of hard parts 5
b. Immediate burial (explain)---3
Distribution:
- Marrine and terrestrial
- Abundant in warm region
- Shallow water
- Benthos
- Less abundant in Paleozoic/ Mesozoic
47.
- Exceed from tertiary to recent. --- 2

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