Environmental Science and Engineering
2025 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE ES 2025 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 49–51 of 65. Imported answers require review unless explicitly marked reviewed.
Question 49
Open questionESNAT2 marksNeeds review
The value of
is ________. (rounded off to two decimal places)Log in to check the answer
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Open questionESNAT2 marksNeeds review
A tank has inflow, outflow and stirring mechanism. Initially, the tank holds 500 L of a brine solution of concentration 200 g/L. At
, an inflow of another brine solution of concentration 100 g/L starts entering the tank at the rate of 15 L/minute. At the same time the outflow of thoroughly stirred mixture also takes place at the same rate so that the volume of brine in the tank remains constant. The brine concentration
(g/L) in the tank at any time
(minute) can be expressed by the following differential equation
The brine concentration in the tank at
hour is ________ g/L. (rounded off to two decimal places)Log in to check the answer
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Open questionESNAT2 marksNeeds review
Aerobic biomass has yield coefficient value of 0.4 for glucose (molecular weight = 180 g/mole) substrate. Bacteria is represented as
(molecular weight = 113 g/mole). Assume that no endogenous respiration occurs. The percentage of carbon going into
from 1 mole/L glucose is __________. (rounded off to two decimal places)Log in to check the answer
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