Irrigation Systems — Set 11

Correct Answer: A. Kallanai Dam in Tamil Nadu (built around 100 CE)

The correct answer is Kallanai Dam in Tamil Nadu (built around 100 CE). The Kallanai Dam on the Kaveri River in Tamil Nadu, built around 100 CE, is one of the oldest dams in the world still in use. It demonstrates the sophistication of ancient Indian irrigation engineering and continues to support irrigation in the region. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. To determine the exact amount of water needed at different growth stages

The correct answer is To determine the exact amount of water needed at different growth stages. Calculating crop water requirement helps determine optimal irrigation amounts based on crop type, growth stage, soil conditions, and climate. This precise calculation improves irrigation scheduling, prevents water wastage, maintains soil moisture balance, and maximizes crop productivity and yield. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. Rainwater harvesting and efficient surface water use

The correct answer is Rainwater harvesting and efficient surface water use. Reducing groundwater depletion requires combining rainwater harvesting with efficient use of surface water from rivers and dams. This integrated water management approach reduces dependency on groundwater, allows aquifers to recharge naturally, and ensures long-term water security for agriculture. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. High initial cost and farmer awareness needed

The correct answer is High initial cost and farmer awareness needed. The main challenges in adopting drip irrigation in India include high initial installation costs (though government subsidies help), need for farmer training and awareness, technical expertise for maintenance, and pressure to use traditional irrigation methods. Overcoming these requires targeted support and extension services. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. Mulching and in-situ water conservation techniques

The correct answer is Mulching and in-situ water conservation techniques. In dry farming, mulching and in-situ water conservation techniques (like contour bunds, terraces, and conservation furrows) maximize water retention in soil. These practices reduce evaporation, improve water infiltration, and enable cultivation of drought-tolerant crops in water-limited regions. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. To maintain canal capacity and water flow efficiency

The correct answer is To maintain canal capacity and water flow efficiency. Desilting (removing accumulated sediment) from canals is essential for maintaining water-carrying capacity and flow efficiency. Regular desilting prevents canal blockages, maintains design discharge, ensures equitable water distribution, and extends canal life. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. North-Eastern region (Assam, Meghalaya, Arunachal Pradesh)

The correct answer is North-Eastern region (Assam, Meghalaya, Arunachal Pradesh). The North-Eastern region receives abundant rainfall and has major rivers like Brahmaputra, resulting in the highest per-capita water availability in India. Despite this abundance, the region faces challenges in water management, irrigation infrastructure development, and flood control. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. To transfer management responsibility from government to farmer organizations

The correct answer is To transfer management responsibility from government to farmer organizations. Irrigation management transfer (IMT) programs delegate responsibility for managing irrigation systems from government agencies to farmer organizations and water users associations. This empowers farmers, improves system efficiency, ensures equitable water distribution, and promotes sustainable management of irrigation infrastructure. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. Solar-powered drip irrigation systems

The correct answer is Solar-powered drip irrigation systems. Solar-powered drip irrigation systems combine renewable energy with water-efficient technology, eliminating fossil fuel dependency and reducing operational costs. They are particularly suitable for remote areas and promote sustainable, environment-friendly agriculture while reducing carbon emissions. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. Irrigation supports 60% of cultivated area and contributes significantly to GDP

The correct answer is Irrigation supports 60% of cultivated area and contributes significantly to GDP. Irrigation supports over 60% of India's cultivated area and produces about 75% of food grains, significantly contributing to GDP and food security. Effective irrigation management is crucial for economic growth, farmer income, and meeting the food needs of India's growing population. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.