____________________ pH is caused by the reaction of water and basic compounds of calcium,
magnesium, and sodium to form hydroxide ions.
Fill in the blank(s) with the appropriate word(s).
ANS: High
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Estimate the re-aeration constant assuming the mean depth of the river is 1.5 meters and the mean velocity is 0.1 m/s.
The Ganges River, shown in Figure 4.66, has an annual average flow rate of 12,105 m3/s. The average temperature of the Ganges River was reported to be 24.6ºC. The Ganges has become contaminated with raw sewerage and industrial waste so that the dissolved oxygen in the river upstream of sewerage discharges is 4.6 mg/L. Suppose that the raw sewerage that is untreated flows into the Ganges at a rate of 460 m3/s, the temperature is 25ºC, and the dissolved oxygen in the sewerage stream is completely depleted (i.e. DO = 0). How would you develop a plan for improving water quality in the Ganges River? What will be an ideal response?
This type of plastic material is formed into a permanent shape by heat and pressure and cannot be altered by heating after curing.
a. plastic b. polymers c. thermoplastic d. thermoset
Which of the following is the link between a cellular phone network and the wired telephone world?
A. SIM card B. Base Station C. MTSO D. IMEI
When parking on a public road, drivers should:
a. move as far away from traffic as possible b. always park on the left side of the roadway c. all of the above