Waste Water Engineering MCQs : This section focuses on the "Basics" of Waste Water Engineering. These Multiple Choice Questions (MCQs) should be practiced to improve the Waste Water Engineering skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Wastewater is the combination of liquid and water-transported wastes from?
A. homes
B. commercial buildings
C. industrial facilities
D. All of the above
View Answer
Ans : D
Explanation: Wastewater is the combination of liquid and water-transported wastes from homes, commercial buildings, industrial facilities, and institutions, along with any groundwater infiltration and surface water and stormwater inflow that may enter the sewer system.
Question 2
How many main sources of wastewater?
A. 1
B. 2
C. 3
D. 4
View Answer
Ans : B
Explanation: There are 2 main sources of wastewater : Domestic Wastewater and Industrial Wastewater.
Question 3
_________ in domestic wastewater usually are caused by gases produced by the decomposition of organic matter or by substances added to the wastewater.
A. Color
B. Temperature
C. Odors
D. Solids
View Answer
Ans : C
Explanation: Odors in domestic wastewater usually are caused by gases produced by the decomposition of organic matter or by substances added to the wastewater.
Question 4
The concentration of physical and chemical pollutants in domestic wastewater is quite variable and particularly dependent upon local conditions.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, The concentration of physical and chemical pollutants in domestic wastewater is quite variable and particularly dependent upon local conditions.
Question 5
The numerical value of the TON is determined as ?
A. (A - B)/A
B. (A - B)/B
C. (A + B)/B
D. (A+B)/A
View Answer
Ans : D
Explanation: The numerical value of the TON is determined as : (A+B)/A Where A = mL of sample and B= mL of odor – free water.
Question 6
Wastewater from different sources like bathrooms, kitchens and wash basins is called ______
A. Sewage
B. Garbage
C. Sullage
D. Discharge
View Answer
Ans : C
Explanation: Dry wastes such as dry leaves, paper and grass are called garbage. Discharge is the outflow of water or wastewater. Sewage is the wastewater from various houses. Sullage is the wastewater from bathroom, kitchen, wash basins, etc.
Question 7
The relatively clean wastewater from baths, sinks, washing machines and other kitchen appliances is called ________
A. Black water
B. Grey water
C. Yellow water
D. Wastewater
View Answer
Ans : B
Explanation: Yellow water refers to the wastewater containing only feces. Black water is the wastewater from bathrooms and toilets. Wastewater generally refers to the water that cannot be used or water produced out of various uses.
Question 8
What is the next step after water abstraction in wastewater treatment?
A. Supply to consumers
B. Treatment
C. Combine with stormwater
D. Supply to receiving body
View Answer
Ans : B
Explanation: Initially, water is abstracted from the river, lake or water table and has a certain quality. Hence water is sent for treatment, where it undergoes transformation to be able to comply with intended uses.
Question 9
The optimum temperature for bacterial activity is in what range?
A. 25-35 degree Celsius
B. 50 degree Celsius
C. 20 degree Celsius
D. 40 degree Celsius
View Answer
Ans : A
Explanation: The optimum temperature for bacterial activity is 25-35 degree Celsius. Aerobic digestion and nitrification stop when the temperature increases up to 50 degree Celsius. When the temperature drops to 15 degree Celsius methane producing bacteria become inactive.
Question 10
Domestic wastewater is the spent water originating from all aspects of human sanitary water usage.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, Domestic wastewater is the spent water originating from all aspects of human sanitary water usage.