Recent questions

In context of ecosystems, which one of the following is NOT a correct statement?The growth of an organism such as a plant may be dependent on a number of different factor...

Which one of the following statements correctly defines the concept of 'Extended Producer's Responsibility'?The responsibility of a producer for environmentally sound dis...

If G represents Gibbs free energy, select the correct statement(s)If $\Delta \mathrm{G}=0$, reaction will proceed only in one directionIf $\Delta \mathrm{G}=0$, reaction ...

For effluents generated by a molasses based distillery and wood based pulp and paper industry, which of the following statement(s) is/are NOT correct?Both the effluents h...

$\quad \mathrm{PM}_{2.5}$ concentrations in ambient air can be measured usingBeta attenuation methodChemiluminescence methodGravimetric methodNon dispersive infrared spec...

Biodegradable wastes like vegetable peelings from kitchen are usually processed by composting techniques. Which of the following option(s) regarding the processing of bio...

As per 'Hazardous and Other Wastes (Management and Transboundary Movement) Rules, $2016$ of Govt. of India, the import of hazardous and other wastes from any country shal...

$\lim _{x \rightarrow 0} \frac{\sqrt{1+x}-1}{x}$ is (rounded off to one decimal place)

The Ministry of Environment, Forest and Climate Change (MoEF\&CC), Govt. of India has published the Environment Impact Assessment (EIA) draft Notification $2020$, intende...

Given, $y=f(x) ; \frac{d^{2} y}{d x^{2}}+4 y=0 ; y(0)=0 ; \frac{d y}{d x}(0)=1$. The problem is a/aninitial value problem having solution $\mathrm{y}=x$boundary value pro...

The following figure shows a $2$-hour unit hydrograph ( $1 \mathrm{~cm}$ rainfall excess) for a catchment area of $540$ hectare. The peak discharge (in $\mathrm{m}^{3} / ...

For an exponentially growing microbial culture, the specific growth rate $(\mu)$ is related to its doubling time $\left(\mathrm{t}_{\mathrm{d}}\right)$ by which one of th...

Eigen values of the matrix $\left[\begin{array}{cc}0 & 1 \\ -2 & 3\end{array}\right]$ are$1$ and $2$$1$ and $3$$1$ and $-2$$0$ and $3$

Which one of the following statements is NOT correct with respect to a batch reactor?No reactant is added after the reactor has started operation.No product is withdrawn ...

A microbial culture, with a specific growth rate of $\mu_{1}$ (per hour), is being grown in a continuous reactor at steady state with hydraulic retention time (HRT) of $2...

A bag filter is used for removal of particulate matter having a range of sizes. The correct sequence of air filtration mechanisms for their removal, in order of decreasin...

During night, in troposphere, which of the following is/are NOT correct$\quad \mathrm{NO}_{2}+\mathrm{ho} \rightarrow \mathrm{NO}+\mathrm{O}$Most of the $\mathrm{NOx}$ (i...

A relatively calm room has background sound power level (SPL) of 30 decibels (dB). A television and a radio with SPL of $80 \mathrm{~dB}$ and $70 \mathrm{~dB}$, respectiv...

A typical plasmid-free bacterial cell having a single chromosome consists of $\sim 55 \%$ protein, $\sim 3 \%$ DNA and $\sim 21 \%$ RNA, where " $\% "$ " represents perce...

Which of the following statement(s) is/are NOT correct while comparing continuously stirred tank reactor (CSTR) and plug flow reactor (PFR)?CSTR and PFR are normally oper...