Physical Division

11. Which of the following rock system in India id the latest one ? [U.P.P.C.S.(Pre)(2016)]

(a) Vindhyan
(b) Cuddapah
(c) Dharwar
(d) Gondwana

Correct Answer: (d) Gondwana

Solution:The rocks of Dharwar order were formed by the transformation or faulting of the rocks of the Archean order. These rocks are highly metallic , in which minerals like gold , iron , Manganese , Mica , Cobalt , Chromium, Copper , Tungsten , Lead etc. are obtained . The Cuddapah Rock system were formed after the rocks of the Dharwar sequence . Limestone , Sandstone , Sugar clay , and black soil are found in them . The rocks of the Gondwana sequence were formed long after the rocks of the Vindhya sequence . Most of india's coal is obtained from the Gondwana region only. The coal of this area is of high graded . Maximum Bituminous coal is obtained here .

12. Read the following statements and choose correct option : [Chhattisgarh P.C.S.(Pre)(2021)]

Statement-1 : J.D. Dana prepared a special Geological Time Scale to indicate the geological history of Indian subcontinent rocks
Statement-2 : As per Geological Time scale, Indian rocks are subdivided into Archaean, Puranic , Dravidian and Aryan periods

(a) Statements -1 and Statements - 2 both are true
(b) Statements -1 and Statements - 2 both are false
(d) Statements -1 is false but Statements - 2 is true
(c) Statements -1 is true but Statements - 2 is false

Correct Answer: (d) Statements -1 is false but Statements - 2 is true

Solution:J.D. Dana's 'Manual of Geology' is a source of information regarding the geology of America. The term Archaean was introduced by J.D. Dana to designate the geological forma- tions older than the Cambrian period. Sir T.S. Holland of the Geological Survey of India has classified rock system of the country into Archaean, Purana, Dravidian and Aryan periods.

13. Ganga Plain has been described as a : [67th B.P.S.C.(Pre)(2022)]

(a) pediplain
(b) peneplain
(c) geosyncline
(d) karst plain

Correct Answer: (c) geosyncline

Solution:Geosyncline is an obsolete concept which means linear trough of subsidence of the Earth's crust within which vast amounts of sediment accumulate. Ganga Plain can be best described as a geosyncline. Peneplain means a more or less level land surface produced by erosion over a long period. Pediplain is a broad, relatively flat rock surface formed by the joining of several pediments. Pediplains are usually formed in arid or semi-arid climates and may have a thin veneer of sediments. Karst plain can be best described as limestone plain.

14. Which one of the following statements about the Indian desert is / are correct? [Chhattisgarh P.C. S.(Pre)(2023)]

(a) The Indian desert lies towards the western margins of the Arvali Hills
(b) This region receives very low rainfall below 150mm per year
(c) Luni is the only large river in this region
(d) All of the above .

Correct Answer: (d) All of the above .

Solution:The Indian desert is popularly known as the Thar desert. The Indian desert lies towards the western margins of the Aravalis hills. It is an undulating sandy plain covered with sand dunes. This region receives very low rainfall below 150 mm per year. It has arid climate with low vegetation cover. Luni is the only large river in this region. Hence all three statements are correct.

Physical Division

11. Which of the following rock system in India id the latest one ? [U.P.P.C.S.(Pre)(2016)]

12. Read the following statements and choose correct option : [Chhattisgarh P.C.S.(Pre)(2021)]

13. Ganga Plain has been described as a : [67th B.P.S.C.(Pre)(2022)]

14. Which one of the following statements about the Indian desert is / are correct? [Chhattisgarh P.C. S.(Pre)(2023)]

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