11. Among the following States, _________has the lowest birth rate in India.
1. Kerala
2. Uttar Pradesh
3. Bihar
4. West Bengal
Option “1” is correct. Kerala has lowest birth rate 14.7, according to the latest official data. Bihar has highest birth rate.
12. _________ is a byproduct of sewage treatment and can be decomposed to produce biogas
1. Sewage
2. Sludge
3. Sewer
4. Scum
Option “2” is correct. Biogas is produced from the anaerobic digestion of organic matter, such as manure, MSW, sewage sludge, biodegradable wastes, and agricultural slurry, under anaerobic conditions with the help of microorganism.
13. Which one of the following cities of Iraq is located on Tigris river?
1. Baghdad
2. Basra
3. Kirkuk
4. None of these
Option “1” is correct. Baghdad is located on the bank of Tigris river.
14. The erosional land forms formed by wave erosion is –
1. Spit
2. Beach
3. Cave
4. Barrier island
Option “3” is correct. The land forms formed by wave erosion is Cave.
15. TGrowing agricultural crops between rows of planted trees is known as –
1. Social forestry
2. Jhum Cultivation
3. Taungya system
4. Community Forestry
Option “3” is correct. Taungya forestry is a form of agroforestry system in which short term crops are grown in the early years of the plantation of a woody perennials species in order to utilize the land, control weeds, reduce establishment costs, generate early income and stimulate the development of the woody perennials species.
16. A drainage pattern where a river is joined by its tributaries approximately at right angles is ___________.
1. Dendritic
2. Trellis
3. Rectangular
4. Radial
Option “2” is correct. A drainage pattern where a river is joined by its tributaries approximately at right angles is Trellis Pattern.
17. The core of the earth is also known as ______.
Option “3” is correct. The core of the earth is also known as Barysphere.
18. The largest producer of Lac in India is-
1. Chhattisgarh
2. Jharkhand
3. West Bengal
4. Gujarat
Option “2” is correct. Jharkhand has the largest number of host trees and ranks first in the country for production of Lac.
19. A tropical deciduous plant special to the Deccan plateau is-
1. Teak
2. Shisam
3. Sandalwood
4. Sal
Option “3” is correct. The Central Deccan Plateau dry deciduous forests in India are an integral part of the Deccan Plateauthat is a large triangular plateau, situated in southern India and sandalwood is a special feature of deccan plateau
20. Which river does not form a delta?
1. Ganga
2. Brahmaputra
3. Godavari
4. Tapi
Option “4” is correct. Tapi river does not form a delta, it form an estuary. An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea.
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