Goa Board Class 12 Question Paper June 2019 Geology

2019 VI 13 1430 Seat No.

Time : 2½ Hours GEOLOGY

Subject Code

H 7 0 6

Total No. Of Questions : 5 (Printed Pages : 6) Maximum Marks : 55

INSTRUCTIONS : (i) All questions are compulsory.

(ii) Answer each question on a fresh page.

(iii) Figures to the right indicate full marks.

(iv) Draw neat labelled diagram wherever necessary.

(v) Answers to the questions carrying 1 mark should be written

in 1 to 10 words.

(vi) Answers to the questions carrying 2 marks should be written

in 50 words.

(vii) Answers to the questions carrying 3 marks should be written

in about 80 words.

(viii) Answers to the questions carrying 4 marks should be written

in about 120 words.

(ix) Select the correct alternative for the multiple choice questions

and rewrite the statement.

H-706 1 P.T.O.

1. (A) Complete the following statement by choosing the correct

alternative given below the statement and write the completed

statement : 1

The Volcanic equivalent of syenite is ..............

• Pegmatite

• Basalt

• Trachyte

• Rhyolite

(B) Which type of stress is responsible for the development of foliation in

metamorphic rocks ? 1

(C) What are essential minerals ? State the essential minerals in rock

Granite. 2

(D) Distinguish between conglomerate and limestone based on their

texture and mineral composition. 2

Or

Distinguish between Slate and Gneiss based on their texture and

mineral composition.

(E) What do you understand by the term metamorphic aureole ? State the

type of metamorphism associated with it. 2

(F) Explain the following : 3

• Poikilitic texture

• Residual sedimentary rocks.

H-706 2

2. (A) Complete the following statement by choosing the correct alternative

given below the statement and write the completed statement : 1

The oldest group of Cuddapah supergroup is ............

• Cheyair group

• Nallamalai group

• Papaghani group

• Kistna group

(B) State the various time units. 1

(C) Arrange the following Eras of the Standard Geological Time scale in

an chronological order and state the periods of Mesozoic Era in

chronological order : 2

Cenozoic Era, Paleozoic Era, Quaternary Era Mesozoic Era.

(D) How are fossils useful in deducing paleoclimate of an area ? 2

(E) State the classification of Vindhyan Supergroup and also state its

age. 2

(F) Explain any three principles of stratigraphy. 3

Or

Explain any three modes of preservation of fossils.

H-706 3 P.T.O.

3. (A) Complete the following statement by choosing the correct alternative

given below the statement and write the completed statement : 1

If the intensity of an earthquake at its epicentre is VII, then

the intensity 700 kms away from epicentre will likely to

be ..............

• IX

• XII

• VIII

• IV

(B) What are pyroclastics ? 1

(C) Name the point within the earth where the elastic waves are

generated ? What is the structural feature associated with that

point ? 2

(D) Explain Pelean type of volcanic with its features. 2

(E) Explain with an example the collision of an ocean plate with a

continental plate. 2

(F) Explain in brief the ‘‘Elastic Rebound Theory’’. 3

Or

Explain in brief the ‘‘formation of fold mountains’’ with reference to

Geosynclinal theory.

H-706 4

4. (A) Complete the following statement by choosing the correct alternative

given below the statement and write the completed statement : 1

A block of the rock that lies above the fault plane is termed

as ...........

• Sickensides

• Foot wall

• Fault surface

• Hanging wall

(B) Draw a neat labelled diagram of a step fault. 1

(C) With neat labelled diagram explain the formation of nonconformity.

2

(D) Explain the following : 3

• Strike joint

• Hade

• Conformable sequence

(E) Explain with neat labelled diagram the various elements of

folds. 4

Or

Explain with neat labelled diagram the various elements of

faults.

H-706 5 P.T.O.

5. (A) Complete the following statement by choosing the correct

alternative given below the statement and write the completed

statement : 1

The impermeable layer responsible for trapping of oil is known
as ..............

• Sandstone

• Anticline

• Cap rock

• Natural gas

(B) Define the term ore. 1

(C) Write a note on distribution of Gold deposits in India. 2

(D) How are placer deposits formed ? 3

(E) Explain the following : 4

• Formation of coal deposits

• Formation of economic mineral by the process of weathering.

H-706 6