Recent questions

​​​​A researcher added certain amount of $\mathrm{HgCl}_{2}$ to water at $\mathrm{pH} 10$. He calculated the expected concentration of mercury in the water. He asked his ...

​​​​​Correctly label the speciation diagram below:$\mathrm{I}=\mathrm{PO}_{4}{ }^{3-}, \mathrm{II}=\mathrm{HPO}_{4}{ }^{2-}, \mathrm{III}=\mathrm{H}_{2} \mathrm{PO}_{4}{ ...

​​​​​Consider the following statements on microbial metabolismUtilization of carbon for cell synthesis is termed as anabolism. During catabolism, adenosine triphosphate (...

​​​​Consider the following figure of an activated sludge process (ASP), depicting the flow $(\mathbf{Q})$, substrate $(\mathbf{S})$, and microorganism concentration $(\ma...

​​Consider the following statementsSound pressure changes with distance from the sourceSound power is a property of the sourceSound intensity is sound power per unit volu...

​​​At a pressure of $1$ atmosphere and temperature of $25^{\circ} \mathrm{C}$, $365 \mu \mathrm{~g} \mathrm{~m}{ }^{-3}$ of a pollutant corresponds to mixing ratio of $13...

​​​​Which option gives the best control strategies for Dioxins and Furans in the flue gas emitted from waste incineration facilities?Avoid burning polystyrene (PS) and po...

​​​​​Choose the correct option(s) from the following regarding the solubility in waterWater is a polar molecule because of the asymmetric distribution of charge between t...

​​​If microbial growth occurs under substrate unlimited conditions, according to Monod's kinetics, choose the correct option(s) from the followingMicrobial growth follows...

​Choose the correct option(s) for removing solids from water.chlorinationcoagulation-flocculation-sedimentation followed by slow sand filtrationchlorination followed by a...

​​According to the Bio-Medical Waste Management Rules, $2016$, choose the correct option(s) from the followingBio-medical waste generated should be taken to a common bio-...

A residential family is considering two cities for relocation. The data related to pollutant exposure and associated health cost per year are given in the following figur...

The value of $\int_{0}^{\infty} \frac{\sin 4 x}{\pi x} d x$ is $\_\_\_\_\_\_$ (rounded off to two decimal places)

The following is a system of linear equations$$\begin{array}{c} x-2 y+z=34 \\ 2 x+y+z=102 \\x+y-3 z=17\end{array}$$The value of $(x+y+z)$ is $\_\_\_\_\_\_$ (rounded off t...

A tank has inflow, outflow and stirring mechanism. Initially, the tank holds $500 \: L$ of a brine solution of concentration $200 \mathrm{~g} / \mathrm{L}$. At $t=0$, an ...

Aerobic biomass has yield coefficient value of $0.4$ for glucose (molecular weight $= 180 \mathrm{~g} / \mathrm{mole}$) substrate. Bacteria is represented as $\mathrm{C}_...

The following figure (not to scale) depicts a rainfall hyetograph for a storm over a catchmentIf the storm produced a direct runoff of $12.5 \: \mathrm{mm}$, then the $\p...

The following table and figure (not to scale) show characteristics of a catchment$$\begin{array}{|c|c|c|c|} \hline \text{Sub-} & \text{Area} &\text{Runoff} & \text{Time ...

A homogeneous isotropic confined aquifer of uniform thickness $30 \: \mathrm{m}$ has hydraulic conductivity of $5 \mathrm{~m} / \mathrm{day}$ and porosity of $0.3$. There...

A pipe line $\boldsymbol{O P} \boldsymbol{Q} \boldsymbol{R}$ branches into three pipes $\boldsymbol{X}, \boldsymbol{Y}$, and $\boldsymbol{Z}$ between points $\boldsymbol{...