Question:
Consider the following statements :
A. The quality of waste water is determined on the basis of dissolved oxygen.
B. The BOD test is based on dissolved oxygen.
C. Determination of dissolved oxygen also helps in controlling corrosion.
Choose the correct answer from the options given below:
Consider the following statements :
A. The quality of waste water is determined on the basis of dissolved oxygen.
B. The BOD test is based on dissolved oxygen.
C. Determination of dissolved oxygen also helps in controlling corrosion.
Choose the correct answer from the options given below:
A. The quality of waste water is determined on the basis of dissolved oxygen.
B. The BOD test is based on dissolved oxygen.
C. Determination of dissolved oxygen also helps in controlling corrosion.
Choose the correct answer from the options given below:
Show Hint
Remember that while oxygen is necessary for life, it is an "enemy" of metal structures. In wastewater treatment plants, maintaining 2 mg/L of DO is generally ideal for aerobic biological processes.
Updated On: May 20, 2026
- A, B and C
- A and B only
- A and C only
- B and C only
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Concept:
Dissolved Oxygen (DO) is one of the most critical parameters in environmental engineering, affecting biological health, chemical stability, and structural integrity of water systems.
Step 1: Evaluate Statement A (Waste water quality).
DO is a direct indicator of the health of a water body. In wastewater, low DO levels indicate high organic pollution as aerobic bacteria consume oxygen to decompose waste. It is fundamental in determining the treatment efficiency and the impact of effluent on receiving waters.
Step 2: Evaluate Statement B (BOD test).
The Biochemical Oxygen Demand (BOD) test specifically measures the amount of oxygen consumed by microorganisms over a 5-day period. The test relies entirely on the difference between initial and final DO levels ($BOD_5 = (DO_{initial} - DO_{final}) \times \text{Dilution Factor}$).
Step 3: Evaluate Statement C (Corrosion control).
In water distribution systems and industrial boilers, dissolved oxygen is a primary agent of electrochemical corrosion (pitting). Removing oxygen from feed water is a standard practice to control the corrosion of metal pipes and boilers.
Step 1: Evaluate Statement A (Waste water quality).
DO is a direct indicator of the health of a water body. In wastewater, low DO levels indicate high organic pollution as aerobic bacteria consume oxygen to decompose waste. It is fundamental in determining the treatment efficiency and the impact of effluent on receiving waters.
Step 2: Evaluate Statement B (BOD test).
The Biochemical Oxygen Demand (BOD) test specifically measures the amount of oxygen consumed by microorganisms over a 5-day period. The test relies entirely on the difference between initial and final DO levels ($BOD_5 = (DO_{initial} - DO_{final}) \times \text{Dilution Factor}$).
Step 3: Evaluate Statement C (Corrosion control).
In water distribution systems and industrial boilers, dissolved oxygen is a primary agent of electrochemical corrosion (pitting). Removing oxygen from feed water is a standard practice to control the corrosion of metal pipes and boilers.
Was this answer helpful?
0
0
Top CUET PG Civil Structural and Transport Engineering Questions
The solution(s) of the ordinary differential equation $y'' + y = 0$, is:
(A) $\cos x$
(B) $\sin x$
(C) $1 + \cos x$
(D) $1 + \sin x$
Choose the most appropriate answer from the options given below:For the matrix, $A = \begin{bmatrix} -4 & 0 \\ -1.6 & 4 \end{bmatrix}$, the eigenvalues ($\lambda$) and eigenvectors ($X$) respectively are:
The value of $\iint_S \vec{F} \cdot \vec{N} \, ds$ where $\vec{F} = 2x^2y \hat{i} - y^2 \hat{j} + 4xz^2 \hat{k}$ and $S$ is the closed surface of the region in the first octant bounded by the cylinder $y^2 + z^2 = 9$ and the planes $x = 0, x = 2, y = 0, z = 0$, is:
The value of the integral $\displaystyle \oint_C \frac{z^3 - 6}{2z - i} \, dz$, where $C: |z| \leq 1$, is:
- In a Binomial distribution, the sum of its mean and variance is $1.8$. If the event was conducted $5$ times, then the probability of two successes is:
View More Questions
Top CUET PG Environmental Engineering Questions
- A sample of waste-water has 4 day 20$^\circ$C B.O.D. value of 75% of the final B.O.D. The rate constant K (to the base 10) per day will be:
- Match LIST-I with LIST-II:\[\begin{array}{|c|c|} \hline \textbf{LIST-I (Treatment method)} & \textbf{LIST-II (Principle / process involved)} \\ \hline \text{A. Trickling filter} & \text{IV. Attached growth} \\ \hline \text{B. Activated sludge process} & \text{III. Suspended growth} \\ \hline \text{C. Aerated lagoon} & \text{II. Mechanical aeration} \\ \hline \text{D. Oxidation pond} & \text{I. Symbiotic} \\ \hline \end{array}\] Choose the most appropriate match from the options given below:
Sequentially arrange the stepwise process of wastewater treatment:
A. Primary sedimentation
B. Screening and Grit removal
C. Disinfection
D. Secondary treatment unit and Secondary Sedimentation
Choose the most appropriate answer from the options given below:- Match LIST-I with LIST-II:\[\begin{array}{|c|c|} \hline \textbf{LIST-I (Air pollutants)} & \textbf{LIST-II (Impact on human health)} \\ \hline \text{A. Particulates} & \text{III. Cause of coughing, shortness of breath, headache etc.} \\ \hline \text{B. Carbon mono-oxides} & \text{I. Impairs transport of O$_2$ in the bloodstream} \\ \hline \text{C. Sulfur oxides} & \text{IV. Cause respiratory illness} \\ \hline \text{D. Photochemical oxidants} & \text{II. Irritation of mucous membranes of the respiratory tract} \\ \hline \end{array}\] Choose the most appropriate match from the options given below:
- A rapid sand filter for a town with a water requirement of 2 MLD is to be provided with a rate of filtration at 4000 liter/hr/m$^2$ with a backwash system. The size of the filter will be:
View More Questions
Top CUET PG Questions
- Given below are two statements:
Statement I: For Plato the meaning of the word 'Justice' is basically a conception in the mind only.
Statement II: For Plato the meaning of the word 'Justice' is fixed, mind-independently
In the light of the above statements, choose the correct answer from the options given below: - What is the electron count of OS6CO182-?
- XeF4 hydrolysis gives A + B, HF, and Oxygen. Find A and B
- What is more basic in pyrol and pyridine?
- Hydrolysis of Al2C3, Be2?
View More Questions