Civil Engineering
2021 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE CE 2021 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 34–36 of 65. Imported answers require review unless explicitly marked reviewed.
Question 24
Open questionCENAT1 markNeeds review
Two reservoirs are connected through a homogeneous and isotropic aquifer having hydraulic conductivity (
) of 25 m/day and effective porosity (
) of 0.3 as shown in the figure (not to scale). Ground water is flowing in the aquifer at the steady state. 
If water in Reservoir 1 is contaminated then the time (in days, round off to one decimal place) taken by the contaminated water to reach to Reservoir 2 will be ______.
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Open questionCENAT1 markNeeds review
A signalized intersection operates in two phases. The lost time is 3 seconds per phase. The maximum ratios of approach flow to saturation flow for the two phases are 0.37 and 0.40. The optimum cycle length using the Webster’s method (in seconds, round off to one decimal place) is ______.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 26
Open questionCEMCQ2 marksNeeds review
The solution of the second-order differential equation
with boundary conditions
and
isYour answerChoose one option.
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