Allied & ICAR Exam Bank • ALLIED_1218 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Tensiometer

Question Statement:

A vacuum gauge tensiometer used for scheduling irrigation is physically restricted to measuring soil matric suction up to a maximum of:

Options:

  • (A) 0.80 to 0.85 bar (80 to 85 kPa)
  • (B) 15 bar (1500 kPa)
  • (C) 100 bar
  • (D) 0.01 bar

Answer Key:

A

Step-by-Step Solution & Explanation

At soil water tensions exceeding approximately $0.85\text{ bar}$, dissolved air cavitation occurs inside the sealed water column of the ceramic cup, breaking vacuum continuity.
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