Q80. Canal lining limits seepage and therefore generally does what to irrigated command area?
[SSC JE Civil (6 June 2024, Shift 1)]
(A) Does not affect it
(B) Leaves it unchanged
(C) Increases it
(D) Decreases it
Answer: (C) Increases it
Explanation: A lined canal loses less water through infiltration along its bed and sides. More water can therefore reach distributaries and farm outlets, potentially extending the irrigated command area while also limiting seepage-induced waterlogging.
Q79. Which statement about soil pollution and water conservation is incorrect?
[SSC JE Civil (6 June 2024, Shift 3)]
(A) Salty irrigation water can salinise land
(B) Rainwater storage bunds are area-treatment works
(C) Area treatment means treatment of natural watercourses
(D) DDT can persist for years in temperate soil
Answer: (C) Area treatment means treatment of natural watercourses
Explanation: Area treatments generally intervene across a watershed landscape, for example with bunds or soil-moisture conservation. Treating natural drainage lines is ordinarily part of drainage-line treatment, making the stated classification incorrect.
Q78. Low-pressure drip pipes release irrigation water in which plant zone?
[MPPGCL JE Civil (1 June 2024, Shift 1)]
(A) General soil zone
(B) Stem zone
(C) Atmospheric zone
(D) Root zone
Answer: (D) Root zone
Explanation: Plant roots absorb most of the applied water and dissolved nutrients. Drip emitters therefore discharge within or near the root zone, reducing evaporation from distant ground and enabling controlled watering of individual crops.
Q77. Which canal type best improves the duty of irrigation water?
[MPPGCL JE Civil (1 June 2024, Shift 1)]
(A) Alluvial unlined canal
(B) Lined canal
(C) Unlined canal
(D) Carrier canal
Answer: (B) Lined canal
Explanation: Concrete or other protective lining reduces water seepage through a canal bed and sidewalls. For a given source discharge, improved conveyance means more water reaches fields, increasing effective duty and reducing unwanted groundwater rise near canals.
Q76. Which set correctly identifies reasons for irrigation?
[MPPGCL JE Civil (1 June 2024, Shift 1)]
(A) Low uneven rain, water-demanding crops, regulated supply
(B) Heavy uneven rain, water-demanding crops, regulated supply
(C) Low uniform rain, water-demanding crops, regulated supply
(D) Low uneven rain, water-demanding crops, unregulated supply
Answer: (A) Low uneven rain, water-demanding crops, regulated supply
Explanation: Farmers need irrigation when rainfall is too little or poorly distributed and when crops require supplemental moisture. Planned irrigation also offers control over timing and quantity of water, whereas unregulated application wastes water and may damage soil.
Q75. Which was not a primary objective of the Damodar Valley Project?
[RPSC Assistant Professor Geography Paper-II (18 May 2024)]
(A) Flood control
(B) Soil erosion
(C) Irrigation development
(D) Hydropower generation
Answer: (B) Soil erosion
Explanation: The Damodar Valley project was conceived as a multipurpose river-basin scheme. Its major objectives included flood moderation, water availability for irrigation and generation of electricity. Soil conservation may be related but is not the principal objective listed.
Q74. In which state is the Polavaram Irrigation Project located?
[OSSC Vital Statistics Assistant (12 March 2024, Shift 1)]
(A) Tamil Nadu
(B) Karnataka
(C) Kerala
(D) Andhra Pradesh
Answer: (D) Andhra Pradesh
Explanation: Polavaram is a multipurpose project on the Godavari River in Andhra Pradesh. Intended uses include irrigation and water transfer, along with other benefits. It is important in discussions of the Godavari basin and agricultural water distribution.
Q73. In which state did farmers develop canal-like channels called kulhs more than 400 years ago?
[UP Police Constable (17 February 2024, Shift 1)]
(A) Himachal Pradesh
(B) Gujarat
(C) Kerala
(D) Karnataka
Answer: (A) Himachal Pradesh
Explanation: Kulhs are traditional hillside channels of Himachal Pradesh that divert water from streams into cultivated fields. The system frequently relied on village cooperation to build, clean and regulate shared watercourses across uneven terrain.
Q72. Tank-based irrigation has traditionally been common in which state?
[PSSSB JE Civil (20 January 2024)]
(A) Madhya Pradesh
(B) Uttar Pradesh
(C) Himachal Pradesh
(D) Andhra Pradesh
Answer: (D) Andhra Pradesh
Explanation: Andhra Pradesh has numerous traditional tanks for capturing seasonal rain and river runoff. These local storage structures support agriculture between monsoon periods, particularly in terrain where maintaining large canals can be costly or impractical.
Q71. Which irrigation method suits lawns and coffee plantations on uneven land with limited water?
[HTET PRT 2024 Official Paper]
(A) Dhekli
(B) Rahat
(C) Drip
(D) Sprinkler
Answer: (D) Sprinkler
Explanation: Sprinklers deliver water as spray and can cover a relatively uneven field without precise surface leveling. Proper nozzle design helps distribute water over lawns and plantation crops; application must be adjusted for wind and available supply.
