Description : Aeration of water is done to remove (A) Odour (B) Colour (C) Bacterias (D) Turbidity
Last Answer : (A) Odour
Description : Disinfection of drinking water, is done to remove (A) Odour (B) Bacterias (C) Turbidity (D) Colour
Last Answer : (B) Bacterias
Description : Disinfection of drinking water is done to remove (A) Turbidity (B) Odour (C) Colour (D) Bacterias
Last Answer : (D) Bacterias
Description : Pick out the true statement pertaining to water treatment. (A) Slow sand filters can remove colour completely (B) Activated carbon can be used for taste & odour control without subsequent filtration ... of water (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation
Last Answer : (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation
Description : Filtration of water is done to remove (A) Colour (B) Odour (C) Turbidity (D) Pathogenic bacteria
Last Answer : (C) Turbidity
Description : Hard water for public water supply is discarded because (A) It consumes more soap (B) It contains lot of turbidity (C) It contains pathogenic bacterias (D) It possesses bad taste and odour
Last Answer : (A) It consumes more soap
Description : Removal of __________ results from the disinfection of water. (A) Turbidity (B) Odour (C) Hardness (D) Bacteria
Last Answer : (D) Bacteria
Description : Pick up the incorrect statement from the following: (A) Water disinfected with ozone is free from any odour (B) Ozone removes bacterias as well as colour and odour (C) Ozonized water becomes tasteless (D) None of these
Last Answer : (C) Ozonized water becomes tasteless
Description : Disinfection of water with ozone is not good because (A) It vanishes before water reaches the consumers (B) It removes the colour, taste and odour from water as bacterias (C) It adds taste to the water (D) It is more efficient than chlorine in killing bacterias
Last Answer : (D) It is more efficient than chlorine in killing bacterias
Description : Presence of bacteria in potable (drinking) water causes (A) Turbidity (B) Disease (C) Bad odour (D) Bad taste & colour
Last Answer : (B) Disease
Description : The following is the physical characteristic of sewage A. Turbidity B. Colour C. Odour D. All the above
Last Answer : ANS: D
Description : . Dechlorination of treated water is necessary to (A) Remove residual turbidity (B) Reduce the bacterial load on filter (C) Control taste and odour (D) Remove chlorinous taste
Last Answer : (D) Remove chlorinous taste
Description : Chlorination of water is done for the removal of A. Bacterias B. Suspended solids C. Sediments D. Hardness
Last Answer : ANS: A
Description : Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes (A) Foaming (B) Odour nuisances (C) Undesirable plant growth (D) Turbidity
Last Answer : (C) Undesirable plant growth
Description : Deaeration of water in its treatment is necessary, as it (A) Minimises its turbidity (B) Helps in controlling its taste and odour (C) Minimises its corrosiveness (D) None of these
Last Answer : (C) Minimises its corrosiveness
Description : The main use of activated carbon in water treatment is to control (A) Bacterial growth (B) Taste and odour (C) Turbidity (D) None of these
Last Answer : (B) Taste and odour
Description : Chloramines are used in water treatment for (A) Disinfection and control of taste & odour (B) Corrosion control (C) Removing turbidity (D) Control of bacteria
Last Answer : (A) Disinfection and control of taste & odour
Description : Alum [Al2 (SO4 )3 ] is used as a coagulant in water treatment to remove (A) Colour (B) Turbidity (C) Bacteria (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Chemical coagulation of drinking water, is done (A) To settle suspended materials (B) To increase rate of settlement of suspended materials (C) To remove the bacterias (D) None of these
Last Answer : (B) To increase rate of settlement of suspended materials
Description : Pick out the false statement pertaining to water treatment. (A) Aeration of water is effective in CO2 removal (B) The zeolite water softening process reduces the hardness of water by not more than 50% (C ... carbonate do not cause hardness in water (D) Water with pH value less than 7, is acidic
Last Answer : (B) The zeolite water softening process reduces the hardness of water by not more than 50%
Description : The resistance of water to the passage of light through it is a measure of the (A) Turbidity (B) Color (C) Hardness (D) Dissolved gases
Last Answer : (A) Turbidity
Description : Hardness of water is caused by (A) Presence of soap lather (B) Presence of chlorides and sulphates of sodium and potassium (C) Presence of bicarbonates, sulphates or chlorides of calcium and magnesium (D) Turbidity
Last Answer : (C) Presence of bicarbonates, sulphates or chlorides of calcium and magnesium
Description : Elastomeric bearings are made of natural or synthetic rubber of shore hardness of approximately. a) 30 to 40 b) 50 to 70* c) 40 to 50 d) 60 to 70
Last Answer : b) 50 to 70
Description : In water treatment plant, use of chloramines ensures (1) taste and odour control (2) weed control in reservoirs (3) disinfection (4) removal of permanent hardness
Last Answer : (3) disinfection Explanation: The particular type of chloramine used in drinking water disinfection is called monochloramine. Chloramine is chiefly a secondary disinfectant that are added to water that has already been disinfected with a primary disinfectant, often chlorine
Description : In water treatment plant, use of chloramines ensures _____ (1) taste and odour control (2) weed control in reservoirs (3) disinfection (4) removal of permanent hardness
Last Answer : disinfection
Description : . Disinfection of water is done to remove (A) Color (B) Bad taste (C) Foul odour (D) Bacteria
Description : Disappearance of pink colour of water of a well due of KMnO4 indicates that water contains (A) Acidity (B) Alkalinity (C) Turbidity (D) Organic matter
Last Answer : (D) Organic matter
Description : Turbidity of water is expressed (A) In ppm (B) In numbers in an arbitrary scale (C) By pH value (D) By colour code
Last Answer : (A) In ppm
Description : Colour of rail ends becomes after preheating ? (i) Golden * (ii) Pink Red (iii) Red (iv) Yellow
Last Answer : (i) Golden
Description : The colour of bag containing Portion for 110 UTS ? (i) Red (ii) Green (iii) Pink (iv) Black*
Last Answer : iv) Black*
Description : he colour of bag containing Portion for 90 UTS ? (i) Red (ii) Green * (iii) Pink (iv) Black
Last Answer : ii) Green *
Description : The colour of bag containing Portion for 72 UTS ? (i) Pink (ii) Green (iii) Red * (iv) Black
Last Answer : (iii) Red *
Description : Q No: 271 Pick up the correct statement from the following: A. Turbidity is more in strong sewage B. The black colour indicates septic sewage C. The sewage omits offensive odours after four hours D. All the above
Description : Pick up the correct statement from the following: (A) For determination of small colour intensities, tintometer is generally used (B) The odour of water sample is generally measured by a term called odour intensity (C) The colour of water sample may be detected by Nessler tube (D) All the above
Last Answer : (D) All the above
Description : An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling. A with conc. `H_(2)SO_(4)` a colour
Last Answer : An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling ... . `C_(2)H_(5)OH` D. `C_(2)H_(6)`
Last Answer : An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling ... . `C_(2)H_(6)` D. `C_(2)H_(5)OH`
Description : The effect of corona can be detected by (a) presence of ozone detected by odour (b) hissing sound (c) faint luminous glow of bluish colour (d) all of the above
Last Answer : (d) all of the above
Description : In septic tanks, decomposition of organic bacteria, is done by A. Anaerobic bacteria B. Aerobic bacteria C. Both types of bacterias D. None of these
Description : Rapid gravity filter can only remove turbidity of water upto (A) 15 to 25 gm/litre (B) 25 to 30 gm/litre (C) 30 to 35 cm/litre (D) 35 to 40 gm/litre
Last Answer : (D) 35 to 40 gm/litre
Description : In the activated sludge process A. Aeration is continued till stability B. Aeration is done with an admixture of previously aerated sludge C. Sludge is activated by constant stirring D. Water is removed by centrifugal action
Last Answer : ANS: B
Description : Ploughing is done to : A. Improve soil aeration C. Increase water holding capacity B. Destroy weeds D. All are correct
Last Answer : All are correct
Description : Indicate which of the statement is incorrect (a) The detritus tank is type of a grit chamber (b) In detritus tank, velocity of flow is further reduced (c) Grit chambers are provided in the sewage ... to remove the heavier inorganic matter as grit, sand etc. from the sewage (d) None of them*
Last Answer : (d) None of them*
Description : Lime and soda ash are added to water to remove (A) Bicarbonates & sulphates of calcium and magnesium (B) Undesirable taste and odour (C) Bacteria (D) Its corrosiveness
Last Answer : (A) Bicarbonates & sulphates of calcium and magnesium
Description : Which of the following survey are required to be done before the construction of new railway line. (a) Traffic survey (b) Reconnaessarice survey (c) Preliminary survey (d) Final location survey (e) All the above
Last Answer : e) All the above
Description : Survey of the major projects is done by (a) Chief Engineer (b) Chief Administrative Officer (CAO) construction* (c) Divisional Railway Manager (d) Railway Board
Last Answer : (b) Chief Administrative Officer (CAO) construction*
Description : Traffic survey is done to find out (a) The most promising route for the railway in the area (b) The possible traffic the railway line will carry (c) Standard of railway line to be followed (d) All the above*
Last Answer : d) All the above*
Description : In setting up a plane table at any station (a) Leveling is done first (b) Centering is done first (c) Both leveling and centering are done simultaneously * (d) Orientation is done first
Last Answer : c) Both leveling and centering are done simultaneously *
Description : Dumpy level is most suitable when (a) The instrument is to be shifted frequently (b) Fly leveling is being done over long distance (c) Many readings are to be taken from a single setting of the instrument* (d) All of the above
Last Answer : (c) Many readings are to be taken from a single setting of the instrument*
Description : For rolling mark 60 kg/Sail/X/2010 the first testing in the field after initial testing of rails in rail manufacturing plant, will be done. (i) After test free period of 25%. (ii) After passage of every 40 ... period.* (iii) After passage of 200 GMT. (iv) On the basis of annual GMT of the section.
Last Answer : (ii) After passage of every 40 GMT traffic during test free period.*
Description : Trimming of AT weld should be done by ? (i) Chisel (ii) Trimmer* (iii) Both (iv) None of the above
Last Answer : ii) Trimmer*