1
GATE CE 2023 Set 1
MCQ (Single Correct Answer)
+2
-0.66

In the following table, identify the correct set of associations between the entries in Column - 1 and Column-2.

Column-1 Column-2
P: Reverse Osmosis III: Concentration Polarization
Q: Trickling Filter I: Ponding
R: Coagulation IV: Charge Neutralization
S: Adsorption II: Freundlich Isotherm
A
P - II, Q - I, S - III
B
Q - III, R - II, S - IV
C
P - IV, R - I, S - II
D
P - III, Q - I, R - IV
2
GATE CE 2023 Set 1
MCQ (More than One Correct Answer)
+2
-0
Which of the following statements is/are TRUE in relation to the Maximum Mixing Depth (or Height) ‘Dmax’ in the atmosphere?
A
Dmax is always equal to the height of the layer of unstable air
B
Ventilation coefficient depends on Dmax
C
A smaller Dmax will have a smaller air pollution potential if other meteorological conditions remain same 
D
Vertical dispersion of pollutants occurs up to Dmax
3
GATE CE 2023 Set 1
Numerical
+2
-0

The composition and energy content of a representative solid waste sample are given in the table. If the moisture content of the waste is 26%, the energy content of the solid waste on dry-weight basis is ________ MJ/kg (round off to one decimal place).

$$ \begin{array}{|c|c|c|} \hline \text { Component } & \text { Percent by mass } & \text { Energy content as-discarded basis (MJ/kg) } \\ \hline \text { Food waste } & 20 & 4.5 \\ \hline \text { Paper } & 45 & 16.0 \\ \hline \text { Cardboard } & 5 & 14.0 \\ \hline \text { Plastics } & 10 & 32.0 \\ \hline \text { Others } & 20 & 8.0 \\ \hline \end{array} $$
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4
GATE CE 2023 Set 1
Numerical
+2
-0

A flocculator tank has a volume of 2800 m3. The temperature of water in the tank is 15°C, and the average velocity gradient maintained in the tank is 100/s. The temperature of water is reduced to 5°C, but all other operating conditions including the power input are maintained as the same. The decrease in the average velocity gradient (in %) due to the reduction in water temperature is ________ (round off to nearest integer).

[Consider dynamic viscosity of water at 15°C and 5°C as 1.139 × 10-3 N - s/m2 and 1.518 × 10-3 N - s/m2 , respectively] 

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