The GATE Grind

GATE 2026 ES – Question 31

Solid and Hazardous Waste Management · Hazardous Waste Management · 1 mark · Multiple select

Which statements are correct? Select all that apply.

  1. Risk depends on the probability and severity of an adverse event.
  2. A higher octanol–water partition coefficient indicates a lower tendency for bioaccumulation.
  3. Pump-and-treat is a groundwater remediation technique.
  4. Biological treatment can never be used for hazardous waste.

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Show answer and explanation

Correct answer: (A) Risk depends on the probability and severity of an adverse event.; (C) Pump-and-treat is a groundwater remediation technique.

Explanation

Risk combines likelihood with consequence, so A is correct. A higher octanol–water partition coefficient generally indicates stronger hydrophobic partitioning and greater bioaccumulation tendency, contrary to B. Pump-and-treat extracts contaminated groundwater for treatment, so C is correct. Some hazardous organic contaminants are biologically degradable, making D’s absolute prohibition false. Select **A, C**.

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