GATE ES 2025 Paper 1 — page 12

Questions 34–36 of 65. Imported answers require review unless explicitly marked reviewed.

is ____________ (rounded off to two decimal places).

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An unconfined aquifer of areal extent 20 km × 20 km has hydraulic conductivity of 4 m/day, porosity of 0.32, and storage coefficient (specific yield) of 0.18. If the initial saturated thickness of the aquifer is 30 m, and 4×10⁸ m³ of water is extracted from the aquifer, then the decline in the saturated thickness is ____________ m. (rounded off to two decimal places)

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A researcher added certain amount of HgCl₂ to water at pH 10. He calculated the expected concentration of mercury in the water. He asked his student to measure the concentration. His student used an instrument that can measure only the free metal, Hg²⁺. The student observed that the concentration measured by him was significantly less than the concentration calculated by the researcher. How can he explain the paradox to the researcher?

Explanation 1: Significant fraction of the mercury would have changed phase from aqueous to gaseous phase, thus leaving less mercury in the water

Explanation 2: Fraction of the mercury added to water would have formed aqueous complexes

Explanation 3: Fraction of the mercury added to water could have precipitated

Choose the correct option from the following

Your answerChoose one option.

only Explanation 1 is correct

Explanations 1 and 2 are correct

Explanations 1 and 3 are correct

Explanations 2 and 3 are correct

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2025 · Paper 1

Question 34

Question 35

Question 36