Quality And Characteristics Of Waste Water Practice Questions

Generate GATE-level questions on Quality And Characteristics Of Waste Water in Environmental Engineering. Focus on core concepts, previous year patterns, and numerical problem-solving techniques.

24 questions · 4 PYQs · 0 AI practice · GATE CE 2027

Q21GATE 2002MCQ

The theoretical oxygen demand of a 0.001 mol/L glucose solution is

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📖 Explanation

$1\: mol\: of\: glucose\rightarrow 6\: moles\: of\: O_{2}$ $0.001\: \frac{mol}{l}\: of\: glucose\rightarrow 0.006\: \frac{mol}{l}\: of\: O_{2}$ Now, number of moles

\begin{aligned} &=\frac{Wt\left ( g \right )}{Molecular\: Wt\left ( g \right )} \\ \therefore \; \; \text{Wt} &=0.006\times 32 \\ &=0.192\: g/l \\ &=192\; mg/l \end{aligned}

Q22GATE 2002MCQ

A wastewater sample has an initial BOD of 222 mg/L. The first order BOD decay coefficient is 0.4/day. The BOD consumed (in mg/L) in 5 days is

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📖 Explanation

BOD consumed

\begin{aligned} &=BOD_{u}\left[ 1-e^{kt} \right]\$ \\ &=222\left[ 1-e^{-0.4\times 5} \right]\$ \\ &= 191.95\; mg/l\simeq 192\: mg/l \end{aligned}

Q23GATE 2002MCQ

In a domestic wastewater sample, COD and BOD were measured. Generally which of the following statement is true for their relative magnitude?

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📖 Explanation

Currently no explanation available

Q24GATE 2001MCQ

If the $BOD_{5,20}$ of waste is 150 mg/L and the reaction rate constant (to the base 'e') at 20 $^{\circ}$ C is 0.35/day, the ultimate BOD in mg/L is

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📖 Explanation

\begin{aligned} k_{D} &=\frac{0.35}{2.3}=0.15/days \\ \text{Now}\; \;150 &=L\left[ 1-10^{-0.15\times 5} \right]\$=0.822\: l \\ \therefore \; \; L &=\frac{150}{0.822}=181.54\: mg/l \end{aligned}

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