Goa Board Class 12 Question Paper 2025 Geology

2025 II 27 0930 Seat No.

Time : 3 Hours GEOLOGY
Subject Code

H 4 7 0 6
Total No. of Questions : 35 (Printed Pages : 7) Maximum Marks : 70

INSTRUCTIONS : (i) All questions are compulsory.

(ii) Draw a neat labelled diagram wherever necessary.

(iii) Figures to the right indicate full marks.

(iv) The question paper consists of four Sections–A, B,
C and D.

(a) Section A has 14 questions of 1 mark each.

(b) Section B has 10 questions of 2 marks each.

(c) Section C has 8 questions of 3 marks each.

(d) Section D has 3 questions of 4 marks each.

(v) The total number of questions in the paper are 35.

(vi) There is no overall choice, however an internal choice
is provided in one question of Section C and two
questions of Section D.

(vii) Select the proper alternative for the multiple choice type
questions and write the completed statement. Multiple
choice type questions should be attempted only once.

(viii) Answers to the questions carrying 1, 2, 3 and 4 marks

should be written in about 1 to 10, 50, 80 and 120 words.

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Section A

1. An ore mineral which shows non-metallic lustre is ................. . 1

• Galena

• Hematite

• Bauxite

• Magnetite

2. Choose the ore mineral with its correct streak from the following ............. . 1

• Chalcopyrite-Greenish black

• Psilomelane-Brown

• Chromite-Cherry red

• Limonite-White

3. Landforms formed due to graben are called as ............... . 1

• Block Mountains

• Caves

• Rift Valleys

• Dome Mountains

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4. When Plunge of a fold is 90º, then the axis of the fold would be ................ 1

• Inclined at 45º to the horizontal

• Vertical

• Horizontal

• Inclined at 45º to its normal

5. An example of Acid Igneous rock is .................... . 1

• Basalt

• Granite

• Syenite

• Diorite

6. A metamorphic product of Limestone is ................. . 1

• Slate

• Gneiss

• Marble

• Phyllite

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7. Carboniferous period is known as age of .................. . 1

• Graptolites

• Cockroaches

• Trilobites

• Fishes

8. What do you mean by Gutenberg Discontinuity ? 1

9. Define the term ‘Epicentre’. 1

10. State one Arenaceous sedimentary rock. 1

11. Olivine and Quartz do not occur together in any rock. Justify. 1

12. What are Conjugate Joints ? 1

13. Name the metamorphic product of Schist ? 1

14. What are volcanic bombs ? 1

Section B

15. Explain with a neat labelled diagram, Early magmatic segregation

Deposits. 2

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16. Give two points of difference between Conglomerate and Shell Limestone. 2

17. Explain with a neat labelled diagram Poikilitic texture. 2

18. What are slickensides. Give its significance. 2

19. Give a brief account of economic importance of Dharwar Supergroup. 2

20. Explain in brief Lithostratigraphic units. 2

21. State the classification of Cuddpah Supergroup. 2

22. Write a short note on Anthracite. 2

23. “Two individuals may conclude different intensities for the same earthquake

at the same time”. Justify. 2

24. Study the following diagram, identify and explain type of fault. 2

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Section C

25. Explain in brief : 3

(i) Principle of Intrusion

(ii) Principle of Inclusion.

26. Explain how igneous rocks are classified based upon silica saturation. 3

27. Explain with a neat diagram Throw and Heave of a fault. 3

28. Explain Strombolian and Vulcanian type of volcanic eruption. 3

Or

Explain with a neat labelled diagram, Composite cone volcano.

29. Illustrate and explain the concept of an oil trap. 3

30. Explain copper belts in India. 3

31. Give 3 points of difference between P-wave and S-wave. 3

32. Explain in brief : 3

(a) Chevron folds

(b) Non-conformity.

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Section D

33. With a neat labelled diagram explain elements of fold. 4

34. Illustrate and explain various features of ocean-ocean convergent plate

interaction. 4

Or

Explain origin of Himalayas with respect to plate tectonics.

35. Describe the stratigraphy of 'Goa Group' of rocks. 4

Or

Describe any four modes of preservation of fossils.

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