Soil and Water Conservation Engineering- ICAR JRF/SRF 2024

Evaluating the Assertion and Reason concerning Plant available water and extractable water:

The correct answer is Option 2: Both (A) and (R) are true but (R) is the correct explanation of (A).

• Cooper-Jacob Semi-Log Analysis of Aquifer Pumping Tests:
• Cooper-Jacob Equation for Unsteady Radial Flow:

where $s$ is drawdown, $Q$ is pumping discharge, $T$ is transmissivity, $S$ is storage coefficient, and $t$ is elapsed time.

• Graphical Response: A plot of drawdown ($s$) on the linear vertical axis against elapsed time ($t$) on the logarithmic horizontal axis yields a Straight Line, allowing easy calculation of aquifer transmissivity and storativity from the slope and zero-drawdown intercept.
• Conclusion: Straight Line (Option 4).

Correct option: (4) Straight Line

Evaluating the Assertion and Reason concerning Pumps and prime movers:

The correct answer is Option 1: Both (A) and (R) are true and (R) is the correct explanation of (A).