206: Which of the following is not favourable for the formation of deltas?
(a) Calm winds
(b) Currents and tides
(c) Sheltered coast
(d) No large lakes in the river course
207: Which of the following minerals are found in a natural way in the State of Chhattisgarh ?
1. Bauxite
2. Dolomite
3. Iron ore
4. Tin
Select the correct answer using the code given below:
(a) 1 and 3 only
(b) I, 2,3 and 4
(c) 1, 2 and 3 only
(d) 2 and 4 only
Explanation:
Chhattisgarh region is as well known for its rich cultural heritage as for its abundant deposits of natural resources. A variety of mineral resources are fond in this region, diamond, gold, iron-ore, coal, corundum, bauxite, dolomite, lime, tin, granite to name a few. Deposits of cumberlite pipe found in Pailikhand and Deobhog area and gold deposits in Sonakhan area of Raipur district have evoked investor interest. High quality iron-ore deposits are found in the Bailadila hill rangesas well as in Dalhi-Rajhara. Abundant deposits of lime stone are found in the districts of Raipur, Bilaspur, Durg and Bastar facilitating the growth of several large cement plants in the area.
208: Which one of the following is also known as Top Slip ?
(a) Simlipal National Park
(b) Periyar Wildlife Sanctuary
(c) Manjira Wildlife Sanctuary
(d) Indira Gandhi Wildlife Sanctuary and National Park
Explanation:
Indira Gandhi Wildlife Sanctuary and National Park is also known as 'Top Slip'. It lies in the Coimbatore District of Tamil Nadu at the southern part of the Nilgiri Biosphere Reserve in the Anamalai Hills.
209: Consider the following statements :
I. Most magmas are a combination of liquid, solid and gas.
II. Water vapour and carbon dioxide are the principal gases dissolved in a magma.
III. Basaltic magma is hotter than the silicic magma.
IV. The magma solidified between sedimentary rocks in a horizontal position is known as dike.
Which of these statements are correct ?
(a) I, II and III
(b) II, III and IV
(c) I and IV
(d) I, II and IV
Explanation:
1, 2, 3 statements are correct but not 4. Because, the magma solidified between sedimentary rocks in a horizontal position is known as 'Sill", but not Dyke (Dyke-Solidification in vertical position).
210: To check the expansion of Thar desert which of the following measures should be used?
(a) Construction of dams
(b) Afforestation
(c) Construction of canals
(d) Artificial rain