Recent questions

The following block diagram highlights the typical phases of the life cycle of a product. In the figure, '$P$', '$Q$', and '$R$' represent various possible scopes of anal...

The United Nations Conference on Environment and Development was held in $1992$ in Rio de Janeiro, Brazil. During this conference, several environmental management princi...

Choose the correct order of biodegradability $\text{(highest to lowest)}$ of the following municipal solid waste components.Food waste $>$ Newspaper $>$ Polyvinyl Chlorid...

Chlorine is most effective as a water disinfectant at a $\text{pH}$ of _____________.$6$ $8$$10$$12$

In proximate analysis, when a $10 \mathrm{~kg}$ moisture-free solid sample is heated in a furnace at $950^{\circ} \mathrm{C}$ in the absence of air, its mass is reduced b...

The oxidation states of ' $\mathrm{N}$ ' in $\mathrm{NH}_{4}^{+}, \mathrm{NO}_{2}^{-}$, and $\mathrm{NO}$ are ________ respectively.$+2,-3$, and +3$-3,+3$, and +2$-3,+3$,...

Which of the following pairing of nucleotide bases is present in double helix DNA?Thymine - CytosineAdenine - ThymineCytosine - AdeninUracil - Thymine

What is the $\text{pH}$ of a water sample having $\mathrm{H}^{+}$ concentration of $10$ $\mathrm{mg} / \mathrm{L}$?The atomic weight of $\mathrm{H}$ is $1 \mathrm{~g} / ...

The ordinary differential equation\[\frac{d y}{d x}=x^{2} y\]has $y$ as the dependent variable and $x$ as the independent variable. Which of the following classification(...

Which of the following is/are both greenhouse gas(es) and ozone depleting substance(s)?$\text{CFC-11}$$\mathrm{CO}_{2}$$\text{HCFC-22}$$\mathrm{N}_{2} \mathrm{O}$

Consider the following equation:$x^{3}-10 x^{2}+31 x-30=0$Which of the following is/are the root(s) of the above equation?$1$$2$$3$$4$

A flocculation tank used for water treatment has a velocity gradient $(G)$ of $800 \mathrm{~s}^{-1}$. The volume of the tank is $40 \mathrm{~m}^{3}$. The dynamic viscosit...

A wind rose is a representation of meteorological conditions. Which of the following is/are included in this representation?Mixing heightWind speedWind directionPercentag...

In a sample, the growth of microbial cells started with an initial concentration of $5 \times 10^4$ cells per millilitre $(\mathrm{mL})$ of the sample. After a certain ti...

A water jet discharging from a $4 \mathrm{~cm}$ diameter orifice has a diameter of 3.5 $\mathrm{cm}$ at its vena contracta. The coefficient of velocity is defined as the ...

Match the entries in Column I with the correct entries in Column II.Column IColumn IIDiffusionPasquillDrag forceFickAtmospheric stabilityStokes$\text{P-(iii), Q-(ii), R-(...

A biased die has six faces numbered as $k=1,2,3,4,5$, and $6$. On rolling the die, the probability of the number k appearing is proportional to $k^{2}$. What is the proba...

Which of the following international multilateral agreements $\text{(conventions, protocols)}$ from Column I match with the entries in Column II?Column IColumn IIRamsar C...

An ideal PFR or an ideal CFSTR may be used to degrade a pollutant with first order reaction kinetics. Both the reactors are fed with the same inlet concentration and the ...