1 - A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called________________?
1 - A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called________________?
house sewer
2 - A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?
2 - A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?
antisiphonage pipe
3 - A pneumatic sewage ejector includes a tank for holding _________
3 - A pneumatic sewage ejector includes a tank for holding _________
Fluid sewage
4 - A sewer that receives the discharge of a number of house sewers is called________________?
4 - A sewer that receives the discharge of a number of house sewers is called________________?
lateral sewer
5 - Activated carbon is used for_____________?
5 - Activated carbon is used for_____________?
removing odours
6 - Air binding phenomena in rapid sand filters occur due to_________________?
6 - Air binding phenomena in rapid sand filters occur due to_________________?
excessive negative head
7 - Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?
7 - Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?
calcium carbonate
8 - Alum as a coagulant is found to be most effective when pH range of water is______________?
8 - Alum as a coagulant is found to be most effective when pH range of water is______________?
6 to 8
9 - An egg shaped section of sewer________________?
9 - An egg shaped section of sewer________________?
provides self cleansing velocity at low discharges
10 - As compared to cast iron pipes, steel pipes are______________?
10 - As compared to cast iron pipes, steel pipes are______________?
stronger
11 - As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is___________________?
11 - As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is___________________?
smaller
12 - As compared to shallow-wells, deep wells have______________?
12 - As compared to shallow-wells, deep wells have______________?
more discharge
13 - Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below?
13 - Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below?
Both A and R are true and R is the correct explanation of A
14 - Average rate of water consumption perhead per day as per Indian Standard is______________?
14 - Average rate of water consumption perhead per day as per Indian Standard is______________?
135 litres
15 - Centrifugal pumps transfer energy from _______
15 - Centrifugal pumps transfer energy from _______
Rotor to fluid
16 - Centrifugal pumps transport fluids by converting _________
16 - Centrifugal pumps transport fluids by converting _________
Kinetic energy to hydrodynamic energy
17 - Chlorine demand of water is equal to________________?
17 - Chlorine demand of water is equal to________________?
difference of applied and residual chlorine
18 - Composting and lagooning are the methods of_______________?
18 - Composting and lagooning are the methods of_______________?
sludge disposal
19 - Corrosion in concrete sewers is caused by______________?
19 - Corrosion in concrete sewers is caused by______________?
septic conditions
20 - Disinfection efficiency is________________?
20 - Disinfection efficiency is________________?
reduced at higher pH value of water
21 - Disinfection of water results in______________?
21 - Disinfection of water results in______________?
killing of disease bacteria
22 - Dissolved oxygen in streams is______________?
22 - Dissolved oxygen in streams is______________?
maximum at noon
23 - Double filtration is used_______________?
23 - Double filtration is used_______________?
to increase the filtration slow sand filters capacity of
24 - Facultative bacteria are able to work in________________?
24 - Facultative bacteria are able to work in________________?
presence as well as in absence of oxygen
25 - For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be________________?
25 - For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be________________?
separate system
26 - For a given discharge, the efficiency of sedimentation tank can be increased by______________?
26 - For a given discharge, the efficiency of sedimentation tank can be increased by______________?
increasing the surface area of tank
27 - For normal sludge, the value of sludge index for Indian conditions is________________?
27 - For normal sludge, the value of sludge index for Indian conditions is________________?
150 to 350
28 - For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as___________________?
28 - For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as___________________?
6.5 to 8.0
29 - For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be__________________?
29 - For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be__________________?
X/2
30 - Gear pumps are ___________
30 - Gear pumps are ___________
Tangential flow pumps
31 - Gear pumps are mainly used in chemical installations because they pump ________
31 - Gear pumps are mainly used in chemical installations because they pump ________
High viscosity fluids
32 - Gear pumps are used to transport ________
32 - Gear pumps are used to transport ________
Fluid
33 - Gear pumps convert rotational kinetic energy to hydrodynamic energy.
33 - Gear pumps convert rotational kinetic energy to hydrodynamic energy.
TRUE
34 - Generally the detention period for grit chambers is kept as_______________?
34 - Generally the detention period for grit chambers is kept as_______________?
1 minute
35 - Ground water is usually free from________________?
35 - Ground water is usually free from________________?
suspended impurities
36 - If the sewage contains grease and fatty oils, these are removed in_________________?
36 - If the sewage contains grease and fatty oils, these are removed in_________________?
skimming tanks
37 - If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be__________________?
37 - If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be__________________?
40 mm/hr
38 - If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?
38 - If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?
total alkalinity
39 - In chlorination, with the rise in temperature of water, death rate of bacteria____________?
39 - In chlorination, with the rise in temperature of water, death rate of bacteria____________?
increases
40 - In facultative stabilization pond, the sewage is treated by________________?
40 - In facultative stabilization pond, the sewage is treated by________________?
dual action of aerobic bacteria and anaerobic bacteria
41 - In lime-soda process________________?
41 - In lime-soda process________________?
lime reduces the carbonate hardness and soda-ash removes the non-carbo¬nate hardness
42 - In water treatment, rapid gravity filters are adopted to remove_______________?
42 - In water treatment, rapid gravity filters are adopted to remove_______________?
bacteria and colloidal solids
43 - Laying of sewers is usually done with the help of________________?
43 - Laying of sewers is usually done with the help of________________?
sight rails and boning rods
44 - Most of the bacteria in sewage are______________?
44 - Most of the bacteria in sewage are______________?
saprophytic
45 - Most suitable section of sewer in separate sewage system is________________?
45 - Most suitable section of sewer in separate sewage system is________________?
circular section
46 - On standard silica scale, the turbidity in drinking water should be limited to_______________?
46 - On standard silica scale, the turbidity in drinking water should be limited to_______________?
10 ppm
47 - Orthotolidine test is used for determination of________________?
47 - Orthotolidine test is used for determination of________________?
residual chlorine
48 - Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?
48 - Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?
75
49 - Period of cleaning of slow sand filters is about________________?
49 - Period of cleaning of slow sand filters is about________________?
2-3 months
50 - Residual chlorine in water is determined by________________?
50 - Residual chlorine in water is determined by________________?
both (A) and (B)
51 - Scour valves are provided ______________?
51 - Scour valves are provided ______________?
at every depression and dead ends to drain out the waste water that may collect there
52 - Settling velocity increases with_______________?
52 - Settling velocity increases with_______________?
depth of tank
53 - Sewage treatment units are designed for_______________?
53 - Sewage treatment units are designed for_______________?
average flow only
54 - Sewage treatment units are normally designed for______________?
54 - Sewage treatment units are normally designed for______________?
15-20 years
55 - Sewerage system is designed for_______________?
55 - Sewerage system is designed for_______________?
maximum and minimum flow
56 - Sewerage system is usually designed for_________________?
56 - Sewerage system is usually designed for_________________?
25 years
57 - Sludge volume index is defined as the ratio of_______________?
57 - Sludge volume index is defined as the ratio of_______________?
percentage of sludge by volume to percentage of suspended solids by weight
58 - Standard BOD is measured at________________?
58 - Standard BOD is measured at________________?
20°C – 5day
59 - The alum, when added as a coagulant in water_______________?
59 - The alum, when added as a coagulant in water_______________?
decreases pH value of water
60 - The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?
60 - The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?
0.05 to 0.5 ppm
61 - The characteristics of fresh and septic sewage respectively are____________________?
61 - The characteristics of fresh and septic sewage respectively are____________________?
alkaline and acidic
62 - The chemical most commonly used to increase speed of sedimentation of sewage is_______________?
62 - The chemical most commonly used to increase speed of sedimentation of sewage is_______________?
lime
63 - The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?
63 - The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?
TOD>COD>BOD
64 - The depression of water table in a well due to pumping will be maximum_______________?
64 - The depression of water table in a well due to pumping will be maximum_______________?
close to the well
65 - The design discharge for the combined sewer system shall be taken as________________?
65 - The design discharge for the combined sewer system shall be taken as________________?
rainfall + 2 DWF
66 - The design discharge for the separate sewer system shall be taken as_____________?
66 - The design discharge for the separate sewer system shall be taken as_____________?
6xDWF
67 - The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?
67 - The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?
more and less
68 - The detention period for oxidation ponds is usually kept as______________?
68 - The detention period for oxidation ponds is usually kept as______________?
10 to 15 days
69 - The detention period in coagulation tanks is usually kept as_______________?
69 - The detention period in coagulation tanks is usually kept as_______________?
2 to 6 hours
70 - The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?
70 - The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?
10 mg/litre
71 - The distribution mains are designed for________________?
71 - The distribution mains are designed for________________?
maximum hourly demand on maxi¬mum day
72 - The effect of increasing diameter of sewer on the self cleansing velocity is_____________?
72 - The effect of increasing diameter of sewer on the self cleansing velocity is_____________?
to increase it
73 - The effective size of sand particles used in slow sand filters is_______________?
73 - The effective size of sand particles used in slow sand filters is_______________?
0.25 to 0.35 mm
74 - The gas from sludge digestion tank is mainly composed of __________________?
74 - The gas from sludge digestion tank is mainly composed of __________________?
methane
75 - The hourly variation factor is usually taken as______________?
75 - The hourly variation factor is usually taken as______________?
1.5
76 - The injection pumps used in most diesel engines can create up to ________
76 - The injection pumps used in most diesel engines can create up to ________
30000 psi
77 - The layout of distribution system in which water flows towards the outer periphery is_________________?
77 - The layout of distribution system in which water flows towards the outer periphery is_________________?
radial system
78 - The length of rectangular sedimentation tank should not be more than_______________?
78 - The length of rectangular sedimentation tank should not be more than_______________?
4B
79 - The main disadvantage of cement concrete sewers is________________?
79 - The main disadvantage of cement concrete sewers is________________?
difficulty in transportation due to heavy weight
80 - The main disadvantage of oxidation pond is that________________?
80 - The main disadvantage of oxidation pond is that________________?
large area is required for construction
81 - The main function of gear pumps are to ________
81 - The main function of gear pumps are to ________
Transfer energy
82 - The major disadvantage of lime soda process of water softening is that_________________?
82 - The major disadvantage of lime soda process of water softening is that_________________?
huge amount of precipitate is formed which creates a disposal problem
83 - The maximum discharge of a tube-well is about_________________?
83 - The maximum discharge of a tube-well is about_________________?
50 litres/sec
84 - The maximum efficiency of BOD removal is achieved in______________?
84 - The maximum efficiency of BOD removal is achieved in______________?
oxidation ditch
85 - The maximum permissible limit for flouride in drinking water is______________?
85 - The maximum permissible limit for flouride in drinking water is______________?
1.5 mg/litre
86 - The means of access for inspection and cleaning of sewer line is known as_______________?
86 - The means of access for inspection and cleaning of sewer line is known as_______________?
manhole
87 - The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is________________?
87 - The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is________________?
circle method
88 - The minimum and maximum diameters of sewers shall preferably be_________________?
88 - The minimum and maximum diameters of sewers shall preferably be_________________?
15 cm and 300 cm
89 - The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is______________?
89 - The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is______________?
4 ppm
90 - The most common cause of acidity in water is_______________?
90 - The most common cause of acidity in water is_______________?
carbon dioxide
91 - The most common pump used for hydraulic fluid power application is __________
91 - The most common pump used for hydraulic fluid power application is __________
Gear pump
92 - The most commonly used sewer under culverts is_______________?
92 - The most commonly used sewer under culverts is_______________?
circular brick sewer
93 - The overflow rate for plain sedimentation tanks is about__________________?
93 - The overflow rate for plain sedimentation tanks is about__________________?
500 to 750 litres/hour/ m2
94 - The pathogens can be killed by_______________?
94 - The pathogens can be killed by_______________?
chlorination
95 - The percentage of chlorine in fresh bleaching powder is about________________?
95 - The percentage of chlorine in fresh bleaching powder is about________________?
30 to 35
96 - The percentage of filtered water, which is used for backwashing in rapid sand filters, is about______________?
96 - The percentage of filtered water, which is used for backwashing in rapid sand filters, is about______________?
2 to 4
97 - The phenolic compounds in public water supply should not be more than_______________?
97 - The phenolic compounds in public water supply should not be more than_______________?
0.001 ppm
98 - The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called_______________?
98 - The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called_______________?
waste pipe
99 - The polluted water is one which_______________?
99 - The polluted water is one which_______________?
consists of undesirable substances rendering it unfit for drinking and domestic use
100 - The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is________________?
100 - The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is________________?
10920
101 - The process in which the chlorination is done beyond the break point is known as_________________?
101 - The process in which the chlorination is done beyond the break point is known as_________________?
super chlorination
102 - The process of lagooning is primarily a means of________________?
102 - The process of lagooning is primarily a means of________________?
disposing of sludge
103 - The rate of Alteration of pressure filters is_________________?
103 - The rate of Alteration of pressure filters is_________________?
greater than that of rapid sand filters
104 - The rate of BOD exerted at any time is_____________?
104 - The rate of BOD exerted at any time is_____________?
directly proportional to BOD remain-ing
105 - The rate of filtration in slow sand filters in million litres per day per hectare is about_____________?
105 - The rate of filtration in slow sand filters in million litres per day per hectare is about_____________?
50 to 60
106 - The ratio of 5 day BOD to ultimate BOD is about_______________?
106 - The ratio of 5 day BOD to ultimate BOD is about_______________?
44960
107 - The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?
107 - The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?
100
108 - The rotational kinetic energy comes from ______
108 - The rotational kinetic energy comes from ______
Engine motor
109 - The self cleansing velocity for all sewers in India is usually_________________?
109 - The self cleansing velocity for all sewers in India is usually_________________?
1.0 m/sec to 1.2 m/sec
110 - The settling velocity of a particle in a sedimentation tank depends on__________________?
110 - The settling velocity of a particle in a sedimentation tank depends on__________________?
surface area of tank
111 - The settling velocity of a particle in a sedimentation tank increases if______________?
111 - The settling velocity of a particle in a sedimentation tank increases if______________?
none of the above
112 - The settling velocity of a particle in a sedimentation tank increases if_________________?
112 - The settling velocity of a particle in a sedimentation tank increases if_________________?
none of the above
113 - The slope of sewer shall be__________________?
113 - The slope of sewer shall be__________________?
given in the direction of natural slope of ground
114 - The specific gravity of sewage is_______________?
114 - The specific gravity of sewage is_______________?
slightly greater than 1
115 - The suitable layout of a distribution system for irregularly growing town is_______________?
115 - The suitable layout of a distribution system for irregularly growing town is_______________?
dead end system
116 - The suitable layout of distribution system for a city with roads of rectangular pattern is______________?
116 - The suitable layout of distribution system for a city with roads of rectangular pattern is______________?
grid iron system
117 - The suitable method for disinfection of swimming pool water is________________?
117 - The suitable method for disinfection of swimming pool water is________________?
ultra violet rays treatment
118 - The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is_________________?
118 - The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is_________________?
combined system
119 - The time of concentration is defined as_______________?
119 - The time of concentration is defined as_______________?
sum of (A) and (B)
120 - The treatment of water with bleaching powder is known as________________?
120 - The treatment of water with bleaching powder is known as________________?
hypochlorination
121 - The type of sewer which is suitable for both combined and separate system is_____________?
121 - The type of sewer which is suitable for both combined and separate system is_____________?
egg shaped sewer
122 - The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is____________________?
122 - The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is____________________?
reflux valve
123 - The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is_______________?
123 - The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is_______________?
sluice valve
124 - The type of valve, which is provided on the suction pipe in a tube-well, is____________?
124 - The type of valve, which is provided on the suction pipe in a tube-well, is____________?
reflux valve
125 - The velocity of flow does not depend on_______________?
125 - The velocity of flow does not depend on_______________?
length of sewer
126 - The velocity of flow of water in a sedimentation tank is about__________________?
126 - The velocity of flow of water in a sedimentation tank is about__________________?
15 to 30 cm/minute
127 - The water carriage system of collection of waste product________________?
127 - The water carriage system of collection of waste product________________?
requires treatment before disposal
128 - The working conditions in imhoff tanks are_______________?
128 - The working conditions in imhoff tanks are_______________?
anaerobic in lower compartment and aerobic in upper compartment
129 - Turbidity is measured on_______________?
129 - Turbidity is measured on_______________?
standard silica scale
130 - When the balancing of the turbine is disturbed, we use ________
130 - When the balancing of the turbine is disturbed, we use ________
Emergency governing
131 - When there is no recirculation of sewage, then recirculation factor is_______________?
131 - When there is no recirculation of sewage, then recirculation factor is_______________?
1
132 - Which of the following chemical compounds can be used for dechlorination of water ?
132 - Which of the following chemical compounds can be used for dechlorination of water ?
sulphur dioxide
133 - Which of the following compounds is widely used for algae control ?
133 - Which of the following compounds is widely used for algae control ?
copper sulphate
134 - Which of the following is not a water borne disease ?
134 - Which of the following is not a water borne disease ?
maleria
135 - Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system ?
135 - Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system ?
equivalent pipe method
136 - Which of the following retards the self purification of stream ?
136 - Which of the following retards the self purification of stream ?
none of the above
137 - Which of the following sewers is preferred for combined system of sewage ?
137 - Which of the following sewers is preferred for combined system of sewage ?
egg shaped sewer
138 - Which of the following unit works in anaerobic conditions ?
138 - Which of the following unit works in anaerobic conditions ?
sludge digestion tank
139 - Which of the following values of pH represents a stronger acid?
139 - Which of the following values of pH represents a stronger acid?
2
140 - With the increase in load, Energy in the turbine ________
140 - With the increase in load, Energy in the turbine ________
Decreases
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