Pick up the incorrect statement from the following?
Pick up the incorrect statement from the following?
Pick up the correct statement from the following?
Pick up the correct statement from the following?
Pick up the correct statement from the following?
Pick up the correct statement from the following?
Pick up the correct statement from the following?
Pick up the correct statement from the following?
Pick up the correct statement from the following ?
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called__________?
The gas which may cause explosion in sewers, is__________?
The discharge per unit plan area of a sedimentation tank, is generally called__________?
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is__________?
Pick up the incorrect statement from the following for allowing workers to enter sewers__________?
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is__________?
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________?
At the junction of sewers__________?
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for__________?
The sewer that unloads the sewage at the point of treatment is called__________?
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________?
If q is the average sewage flow from a city of population P, the maximum sewage flow__________?
If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is__________?
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains__________?
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called__________?
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is__________?
The grit and silt of the grit chambers, may not be used for__________?
Imhoff cone is used to measure__________?
Dilution method of disposing of sewage, is not preferred to__________?
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is__________?
For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of__________?
In sewers the velocity of flow should not be__________?
In sewers the effect of scouring is more on__________?
Sewer ventilating columns are generally placed at__________?
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is__________?
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known__________?
Water content of sewage is about__________?
The most efficient cross-section of sewers in a combined sewerage system is__________?
The factor responsible for purification of sewage in river is__________?
To maintain aerobic biological activity, the moisture content of the compost mass should be about__________?
The pH value of sewage is determined with the help of__________?
The normal value of over flow rates for plain primary sedimentation tanks, ranges between__________?
Which one of the following statements regarding septic tanks is wrong ?
In areas where rainy season is limited to a few months, the type of sewerage system recommended is__________?
Dried sewage after treatment is used as__________?
In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is__________?
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of__________?
Pick up the in-correct statement from the following?
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is__________?
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to__________?
If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is__________?
For evaporation and measurement of settable solids, the apparatus used, is__________?

Traps_________________?

A. Are water seals which prevent the entry of foul gases
B. Are used to trap the rats entering sewers
C. Dissolve the foul gases
D. Create symphonic action to increase the quick disposal of sewerage

Correct Answer: Are water seals which prevent the entry of foul gases ✔

Last Updated: August 25, 2020