Match the following columns:
| Column I (Methods of measuring soil moisture) | Column II (Useful range kpa) |
| a. Tensiometer | 1. 0 to < -1500 |
| b. Resistance blocks | 2. 50 to < -10000 |
| c. Neutron scattering | 3. -100 to< -1500 |
| d. Pressure membrane apparatus | 4. 0 to -85 |
A. a-2, b-3, c-1, d-4
B. a-4, b-1, c-3, d-2
C. a-4, b-3, c-1, d-2
D. a-2, b-1, c-3, d-4
Answer: Option C
Solution (By Examveda Team)
Tensiometer is used to measure head and pressure in the unsaturated zone in the soil. Its range is between 0 to -85 kpa.A resistance block is a soil moisture block often referred to as a gypsum block or electrical resistance block, which is a device for measuring soil moisture changes. Its range is in between -100 to < -1500 kpa.
Neutron scattering is the technique of choice for condensed matter investigations to measure soil moisture. Its useful range kpa is 0 to < -1500 kpa.
Pressure membrane apparatus is used to determine soil water retention and suctions greater than 0.4 bar, and its useful range is 50 to < -10000 kpa.
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