Test Papers / Previous Question Papers of Indira Gandhi National Open University ET531A Earth & Its Environment December 2006

B.Tech. Civil (Water Resources Management)

Term-End Examination

ET531A: Earth & Its Environment

Time: 3 hours
Maximum Marks: 70

Note: (i) Answer any five questions.
(ii) All questions carry equal marks.
(iii) Support your answer with suitable sketches wherever necessory.
(iv) Answers should be in your own language.
(v) Use of non programmable calculator is allowed.

December 2006

1. (a) Describe the various major hypotheses put forth to explain the origin of the solar system. (7)

(b) Explain the hydrologic cycle with the help of a neat sketch. (7)

2. (a) Describe the process of cloud formation and list the various types of clouds. (7)

(b) What is wind? Describe the various types of forces acting upon the air mass. (7)

3. (a) What is an igneous rock? Discuss the various classes of igneous rocks. (7)

(b) Describe active and inactive faults with the help of diagrams. (7)

4. (a) Explain the major types of foliation. (7)

(b) Explain any two of the following terms with examples: (2 x 3 1/2 = 7)

(i) Fossils
(ii) Stratigraphy
(iii) Homeostatis

5. (a) What is meant by biogeochemical cycles? Represent any one cycle diagrammatically (7)

(b) What do you understand by the law of tolerance? Explain it with the help of a diagram. (7)

6. (a) Elaborate the abiotic factors that will affect the pattern of succession in a riverine community (7)

(b) Distinguish between laminar flow and turbulent flow. (7)

7. Write short notes on any four of the following (4 x 3 1/2 = 14)

(a) Stratosphere
(b) Ballot's law
(c) Hydrodynamic fabric
(d) Faults
(e) Biotic components of an ecosystem
(f) Ecological niche

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