1
GATE CE 2025 Set 1
MCQ (Single Correct Answer)
+1
-0.33
Fecal Coliform (FC) concentration in river water was measured as 10780 cfu/100 ml. The FC concentration after the conventional water treatment, but before chlorination, was measured as $23 \mathrm{cfu} / 100 \mathrm{ml}$. The 'Log Kill' (inactivation) of FC due to the conventional water treatment is closest to
2
GATE CE 2025 Set 1
MCQ (Single Correct Answer)
+1
-0.33
A hydrocarbon $\left(\mathrm{C}_n \mathrm{H}_m\right)$ is burnt in air $\left(\mathrm{O}_2+3.78 \mathrm{~N}_2\right)$. The stoichiometric fuel to air mass ratio for this process is
Note: Atomic Weight: $\mathrm{C}(12), \mathrm{H}(1)$
Effective Molecular Weight: Air(28.8)
Ignore any conversion of N 2 in air to the oxides of nitrogen $\left(\mathrm{NO}_{\mathrm{x}}\right)$
3
GATE CE 2025 Set 1
MCQ (More than One Correct Answer)
+1
-0
The Surface Overflow Rate (SOR) in a rectangular sedimentation tank is $45 \mathrm{~m}^3 / \mathrm{m}^2 / \mathrm{d}$. Minimum diameters of spherical inorganic and organic particles expected to be completely removed in this tank are calculated. Assume that Stoke's law is applicable. Which of the following options is/are correct:
Specific gravity of inorganic particles $=2.65$
Specific gravity of organic particles $=1.20$
Acceleration due to gravity $(\mathrm{g})=9.81 \mathrm{~m} / \mathrm{s}^2$
Kinematic viscosity $(v)=1 \times 10^{-6} \mathrm{~m}^2 / \mathrm{s}$
4
GATE CE 2025 Set 1
MCQ (More than One Correct Answer)
+1
-0
Aeration is employed as a treatment option for the removal of several pollutants from contaminated water.
Identify the pollutant(s), where aeration is employed as a part of their removal:
Paper analysis
Total Questions
Construction Material and Management
5
Engineering Mathematics
10
Environmental Engineering
7
Fluid Mechanics and Hydraulic Machines
5
Geomatics Engineering Or Surveying
3
Geotechnical Engineering
8
Hydrology
4
Reinforced Cement Concrete
2
Steel Structures
1
Strength of Materials Or Solid Mechanics
2
Structural Analysis
4
Transportation Engineering
4
General Aptitude
10
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