Pick up the incorrect statement from the following: (A) The water entering the slow sand filters should be treated by 9.386 coagulants (B) The depth of water on the filter should be twice the depth of the filter sand (C) When the filter head is 0.75 times the depth of filter sand, the water obtained is purest (D) All the above

Pick up the incorrect statement from the following: 

(A) The water entering the slow sand filters should be treated by 9.386 coagulants 

(B) The depth of water on the filter should be twice the depth of the filter sand 

(C) When the filter head is 0.75 times the depth of filter sand, the water obtained is purest 

(D) All the above 

by

1 Answer

Answer :

(D) All the above 

by

Related questions

In slow sand filters, the turbidity of raw water can be removed only up to (A) 60 mg/litre (B) 75 mg/litre (C) 100 gm/litre (D) 150 mg/litre

Description : In slow sand filters, the turbidity of raw water can be removed only up to  (A) 60 mg/litre  (B) 75 mg/litre  (C) 100 gm/litre  (D) 150 mg/litre 

Last Answer : (A) 60 mg/litre 

The bed slope in slow sand filters, is generally kept (A) 1 in 50 (B) 1 in 75 (C) 1 in 100 (D) 1 : 200

Description : The bed slope in slow sand filters, is generally kept  (A) 1 in 50  (B) 1 in 75  (C) 1 in 100  (D) 1 : 200

Last Answer : (C) 1 in 100 

Rapid gravity filters (A) Were developed by G.W. Fuller (B) Make use of coarser sand with effective size as 0.5 mm (C) Yield as high as 30 times the yield of slow sand filters (D) All the above

Description : Rapid gravity filters  (A) Were developed by G.W. Fuller  (B) Make use of coarser sand with effective size as 0.5 mm  (C) Yield as high as 30 times the yield of slow sand filters  (D) All the above 

Last Answer : (D) All the above 

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 (C) Application of activated carbon reduces the temporary hardness of water (D) Normally, the turbidity is removed by adding a coagulant prior to sedimentation

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

Pick up the correct statement from the following: (A) Detention period for plain sedimentation tanks ranges between 4 to 8 hours (B) Detention period for sedimentation tanks, using coagulants usually ranges between 2 to 4 hours(C) The horizontally flow velocity in sedimentation tanks, is generally limited to 0.3 m/minute (D) All the above

Description : Pick up the correct statement from the following:  (A) Detention period for plain sedimentation tanks ranges between 4 to 8 hours  (B) Detention period for sedimentation tanks, using coagulants usually ... in sedimentation tanks, is generally limited to 0.3 m/minute  (D) All the above

Last Answer : (D) All the above

A slow sand filter is cleaned if its filter head is higher than (A) 10 cm to 20 cm (B) 20 cm to 40 cm (C) 40 cm to 70 cm (D) 70 cm to 120 cm

Description : A slow sand filter is cleaned if its filter head is higher than  (A) 10 cm to 20 cm  (B) 20 cm to 40 cm  (C) 40 cm to 70 cm  (D) 70 cm to 120 cm

Last Answer : (D) 70 cm to 120 cm

A slow sand filter is cleaned if its filter head is higher than (A) 10 cm to 20 cm (B) 20 cm to 40 cm (C) 40 cm to 70 cm (D) 70 cm to 120 cm

Description : A slow sand filter is cleaned if its filter head is higher than (A) 10 cm to 20 cm (B) 20 cm to 40 cm (C) 40 cm to 70 cm (D) 70 cm to 120 cm

Last Answer : (D) 70 cm to 120 cm

The yield of a rapid gravity filter as compared to that of slow sand filter, is (A) 10 times (B) 15 times (C) 20 times (D) 30 times

Description : The yield of a rapid gravity filter as compared to that of slow sand filter, is (A) 10 times (B) 15 times (C) 20 times (D) 30 times

Last Answer : (D) 30 times

Pick up the incorrect statement from the following. For performing compressive strength test of cement (A) Cement and standard sand mortar are used in the ratio of 1 : 3 (B) Water is added at the rate of (P/4) + 3.0 percentage of water where P is the percentage of water for standard consistency (C) A cube mould of 10 cm × 10 cm × 10 cm is used (D) The prepared moulds are kept in a atmosphere of 50% relative humidity

Description : Pick up the incorrect statement from the following. For performing compressive strength test of cement (A) Cement and standard sand mortar are used in the ratio of 1 : 3 (B) Water is added at the ... cm 10 cm is used (D) The prepared moulds are kept in a atmosphere of 50% relative humidity

Last Answer : Answer: Option A

Pick out the wrong statement. (A) The value of hydrostatic head increases with increase in vacuum in the effect in a multiple effect evaporator system (B) Entering velocity of the liquid in the tubes of natural circulation evaporators is in the range of 0.3 to 0.9 metre/second (C) Duhring's plot is used for calculating the concentration of solution (D) In a multiple effect evaporation system, the number of effects is limited by the total boiling point rise

Description : Pick out the wrong statement. (A) The value of hydrostatic head increases with increase in vacuum in the effect in a multiple effect evaporator system (B) Entering velocity of the liquid in ... a multiple effect evaporation system, the number of effects is limited by the total boiling point rise

Last Answer : (C) Duhring's plot is used for calculating the concentration of solution

Slow sand filter is used if maximum turbidity of raw water is less than (A) 10 gm/litre (B) 20 gm/litre (C) 30 gm/litre (D) 50 gm/litre

Description : Slow sand filter is used if maximum turbidity of raw water is less than (A) 10 gm/litre (B) 20 gm/litre (C) 30 gm/litre (D) 50 gm/litre

Last Answer : (D) 50 gm/litre

A high velocity of wash water is required for (A) Rapid gravity filter with strainers (B) Rapid gravity filter without strainers (C) Slow sand filter with strainers (D) Slow sand filter without strainers

Description : A high velocity of wash water is required for (A) Rapid gravity filter with strainers (B) Rapid gravity filter without strainers (C) Slow sand filter with strainers (D) Slow sand filter without strainers

Last Answer : (B) Rapid gravity filter without strainers

Efficiency of removing bacterias from raw water by a slow sand filter, is (A) 80% to 81% (B) 85% to 86% (C) 90% to 97% (D) 98% to 99%

Description : Efficiency of removing bacterias from raw water by a slow sand filter, is (A) 80% to 81% (B) 85% to 86% (C) 90% to 97% (D) 98% to 99%

Last Answer : (D) 98% to 99%

Distribution of wash water is provided in (A) Sedimentation tank (B) Slow sand filter (C) Rapid gravity filter (D) All the above

Description : Distribution of wash water is provided in  (A) Sedimentation tank  (B) Slow sand filter  (C) Rapid gravity filter  (D) All the above 

Last Answer : (C) Rapid gravity filter

After cleaning a slow sand filter, the filtered water is not used for (A) 6 hours to 12 hours (B) 12 hours to 18 hours (C) 18 hours to 24 hours (D) 24 hours to 36 hours

Description : After cleaning a slow sand filter, the filtered water is not used for  (A) 6 hours to 12 hours  (B) 12 hours to 18 hours  (C) 18 hours to 24 hours  (D) 24 hours to 36 hours 

Last Answer : (D) 24 hours to 36 hours 

Pick up the incorrect statement from the following: (A) Porosity of clay sand soil is 45% (B) Porosity of pure sand is 35% (C) Porosity of sand stone is up to 15% (D) None of these

Description : Pick up the incorrect statement from the following: (A) Porosity of clay sand soil is 45% (B) Porosity of pure sand is 35% (C) Porosity of sand stone is up to 15% (D) None of these

Last Answer : (D) None of these

Pick up the incorrect statement from the following: (A) Concrete for which preliminary tests are conducted, is called controlled concrete (B) Bulking of sand depends upon the fineness of grains (C) Concrete mix 1 : 6 : 12, is used for mass concrete in piers (D) All the above

Description : Pick up the incorrect statement from the following: (A) Concrete for which preliminary tests are conducted, is called controlled concrete (B) Bulking of sand depends upon the fineness of grains (C) Concrete mix 1 : 6 : 12, is used for mass concrete in piers (D) All the above

Last Answer : Answer: Option D

Pick up the incorrect statement (a) lithium bromide used in vapour absorption cycle is nonvolatile (b) lithium bromide plant can't operate below 0°C (c) a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing (d) concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator

Description : Pick up the incorrect statement (a) lithium bromide used in vapour absorption cycle is nonvolatile (b) lithium bromide plant can't operate below 0°C (c) a separator is used in lithium ... of solution coming out of lithium bromide generator is more in comparison to that entering the generator

Last Answer : Ans: c

Pick up the incorrect statement from the following: (A) Free surface ground water is subjected to atmospheric pressure (B) Water table surface rises and falls with seasons (C) Depth of water table is directly proportional to the rate of drawl of water (D) Level of water table remains stationary

Description : Pick up the incorrect statement from the following:  (A) Free surface ground water is subjected to atmospheric pressure  (B) Water table surface rises and falls with seasons  (C) ... directly proportional to the rate of drawl of water  (D) Level of water table remains stationary 

Last Answer : (D) Level of water table remains stationary 

Pick up the incorrect statement from the following: (A) The net amount of water which joins the surface streams in a catchment, is known as surface run-off (B) The amount of water which joins the stream from the underground water, is called base flow (C) The yearly run off in cm depth over the catchment, is termed as the yield of the drainage basin(D) None of these

Description : Pick up the incorrect statement from the following:  (A) The net amount of water which joins the surface streams in a catchment, is known as  surface run-off  (B) The amount of water which ... over the catchment, is termed as the yield of the drainage  basin  (D) None of these

Last Answer : (D) None of these

Pick up the incorrect statement from the following: (A) The smaller the size of the pores, the higher the water can rise above the water table (B) Below the water table, the pore water may be static (C) The hydrostatic pressure depends on the depth below the water level (D) None of these

Description : Pick up the incorrect statement from the following: (A) The smaller the size of the pores, the higher the water can rise above the water table (B) Below the water table, the pore water may be static (C) The hydrostatic pressure depends on the depth below the water level (D) None of these

Last Answer : Answer: Option D

Pick up the incorrect statement from the following: (A) The rate of flow of water through a unit cross-sectional area under a unit hydraulic gradient, is called coefficient of permeability (B) The rate of flow of water through a vertical strip of the aquifer of unit width and full depth under a unit hydraulic gradient, is called coefficient of transmissibility (C) The flow of water through aquifers, is governed by the Darcy's law (D) The term 'transmissibility' was introduced by Meinzer

Description : Pick up the incorrect statement from the following: (A) The rate of flow of water through a unit cross-sectional area under a unit hydraulic gradient, is called coefficient of permeability (B) ... aquifers, is governed by the Darcy's law (D) The term 'transmissibility' was introduced by Meinzer

Last Answer : Answer: Option D

Rapid sand filter (A) Should be preceded by coagulation and sedimentation (B) Uses rapid sand as filter media(C) Is used after slow sand filtering has been done (D) Can combine disinfection also

Description : Rapid sand filter (A) Should be preceded by coagulation and sedimentation (B) Uses rapid sand as filter media (C) Is used after slow sand filtering has been done (D) Can combine disinfection also

Last Answer : (A) Should be preceded by coagulation and sedimentation

The period of cleaning of a slow sand filter, is usually (A) 5 to 10 days (B) Two weeks to three weeks (C) One month to three months (D) Three months to six months

Description : The period of cleaning of a slow sand filter, is usually (A) 5 to 10 days (B) Two weeks to three weeks (C) One month to three months (D) Three months to six months

Last Answer : (C) One month to three months

Pick up the incorrect statement from the following for allowing workers to enter sewers A. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes B. Proper tests for the presence of poisonous gases must be carried out C. The men entering the manhole should be advised to smoke in the sewer D. Warning signals should be erected

Description : Pick up the incorrect statement from the following for allowing workers to enter sewers A. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 ... entering the manhole should be advised to smoke in the sewer D. Warning signals should be erected

Last Answer : ANS: C

Pick up the incorrect statement from the following: (A) The width of the wall is constructed thicker at the base in a stepped fashion (B) A long vertical load transferring concrete structure is called a concrete pile (C) In pile which transfers the load to the soil by the friction between the pile and the surrounding soil is called friction pile (D) The pile which transfers the load to a hard rock bed at certain depth is called load bearing

Description : Pick up the incorrect statement from the following: (A) The width of the wall is constructed thicker at the base in a stepped fashion (B) A long vertical load transferring concrete structure is ... ) The pile which transfers the load to a hard rock bed at certain depth is called load bearing

Last Answer : Answer: Option D

Pick up the correct statement from the following: (A) The apparent error on reversal is twice the actual error (B) The correction may be made equal to half the observed discrepancy (C) The good results may be obtained from a defective instrument by reversing and taking the mean of two erroneous results (D) All the above

Description : Pick up the correct statement from the following: (A) The apparent error on reversal is twice the actual error (B) The correction may be made equal to half the observed discrepancy (C) The ... a defective instrument by reversing and taking the mean of two erroneous results (D) All the above

Last Answer : (D) All the above

Pick up the correct statement from the following: (A) Sand obtained from pits, is washed to remove clay and silt (B) Sand obtained from flooded pits, need not be washed before use (C) The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous (D) All the above

Description : Pick up the correct statement from the following: (A) Sand obtained from pits, is washed to remove clay and silt (B) Sand obtained from flooded pits, need not be washed before use (C) The ... shore sand and shingle may cause corrosion of reinforcement if the concrete is porous (D) All the above

Last Answer : Answer: Option D

Pick up the incorrect statement from the following: (A) Hydraulic lime is generally obtained by burning kankar (B) Hydraulic lime sets slowly as compared to fat lime (C) Hydraulic lime is generally used in lime mortar (D) None of these

Description : Pick up the incorrect statement from the following: (A) Hydraulic lime is generally obtained by burning kankar (B) Hydraulic lime sets slowly as compared to fat lime (C) Hydraulic lime is generally used in lime mortar (D) None of these

Last Answer : Answer: Option D

Pick up the correct statement from the following: (A) In order to check up the average depth of excavation, 'Dead man s' are left at the midwidths of borrow pits (B) The earthwork calculation in excavation is made from the difference in levels obtained with a level (C) The earth work in excavation to form the road embankment includes the formation of correct profile and depositing the soil in layers (D) All the above

Description : Pick up the correct statement from the following: (A) In order to check up the average depth of excavation, 'Dead man s' are left at the midwidths of borrow pits (B) The earthwork ... embankment includes the formation of correct profile and depositing the soil in layers (D) All the above

Last Answer : (D) All the above

Pick up the correct statement from the following: (A) The height of head light above road surface, is taken as 0.75 m (B) The beam of head light is up to one degree upwards from the grade of road (C) While designing the valley curve, the height of the object is assumed nil (D) All the above

Description : Pick up the correct statement from the following: (A) The height of head light above road surface, is taken as 0.75 m (B) The beam of head light is up to one degree upwards from the grade of road (C) While designing the valley curve, the height of the object is assumed nil (D) All the above

Last Answer : Answer: Option D

The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is (A) 2 m (B) 2.25 m (C) 2.50 m (D) 3.00 m

Description : The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If  the working depression head of the well is 3 m, the minimum diameter of the well, is  (A) 2 m  (B) 2.25 m  (C) 2.50 m  (D) 3.00 m 

Last Answer : (D) 3.00 m 

Pick up the incorrect statement from the following: A. The mixture of water and waste products, is called sewage B. The treated sewage effluents, are generally used for irrigating the crops C. The process of collecting, treating and disposing off the sewage, is called sewerage D. The old convergence system was definitely better than water carried sewerage system

Description : Pick up the incorrect statement from the following: A. The mixture of water and waste products, is called sewage B. The treated sewage effluents, are generally used for irrigating the ... is called sewerage D. The old convergence system was definitely better than water carried sewerage system

Last Answer : ANS: D

Pick up the incorrect statement from the following: (A) An activity of a project is denoted by an arrow on the net work (B) The tail of the arrow indicates the start of the activity (C) The head of the arrow indicates the end of the activity (D) The arrows are drawn to scale from left to right

Description : Pick up the incorrect statement from the following: (A) An activity of a project is denoted by an arrow on the net work (B) The tail of the arrow indicates the start of the activity (C) The head of the arrow indicates the end of the activity (D) The arrows are drawn to scale from left to right

Last Answer : (D) The arrows are drawn to scale from left to right

The maximum permitted loss of head in a rapid sand filter, is (A) 1 m (B) 2 m (C) 3 m (D) 4 m

Description : The maximum permitted loss of head in a rapid sand filter, is (A) 1 m (B) 2 m (C) 3 m (D) 4 m

Last Answer : (C) 3 m

Normal values of overflow rate for plain sedimentation tank using coagulants, is (A) 750 to 1000 litres/hr/m2(B) 1000 to 1250 litres/hr/m2(C) 1250 to 1500 litres/hr/m2(D) 1500 litres/hr/m

Description : Normal values of overflow rate for plain sedimentation tank using coagulants, is (A) 750 to 1000 litres/hr/m2 (B) 1000 to 1250 litres/hr/m2 (C) 1250 to 1500 litres/hr/m2 (D) 1500 litres/hr/m

Last Answer : (B) 1000 to 1250 litres/hr/m2

Normal values of overflow rate for sedimentation tanks using coagulants in litres/hr/m2 , generally range between (A) 250 to 500 (B) 500 to 750 (C) 750 to 1000 (D) 1000 to 1250

Description : Normal values of overflow rate for sedimentation tanks using coagulants in litres/hr/m2 , generally range between (A) 250 to 500 (B) 500 to 750 (C) 750 to 1000 (D) 1000 to 1250

Last Answer : (D) 1000 to 1250

Water filtration rate in a slow sand filter ranges from __________ litres/m2 /hr. (A) 10 to 20 (B) 100 to 200 (C) 1500 to 2500(D) 4000 to 5000

Description : Water filtration rate in a slow sand filter ranges from __________ litres/m2 /hr. (A) 10 to 20 (B) 100 to 200 (C) 1500 to 2500 (D) 4000 to 5000

Last Answer : (B) 100 to 200

For different layers of cement concrete floor. Pick up the incorrect statement from the following: (A) The lowest layer consists of consolidated ground (B) A 10 cm thick clean sand is laid on consolidated ground (C) A 10 cm lime concrete (1 : 4 : 8) is laid on clean sand (D) A 10 cm thick cement concrete (1 : 2 : 4) is laid on top layer

Description : For different layers of cement concrete floor. Pick up the incorrect statement from the following: (A) The lowest layer consists of consolidated ground (B) A 10 cm thick clean sand is laid on consolidated ground (C) ... sand (D) A 10 cm thick cement concrete (1 : 2 : 4) is laid on top layer

Last Answer : Option D

In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than (A) 10 (B) 15 (C) 20 (D) 25

Description : In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than (A) 10 (B) 15 (C) 20 (D) 25

Last Answer : (C) 20

An ideal sand for filters should be (A) Free from dirt and other impurities (B) Uniform in nature and size (C) Hard and resistant (D) All the above

Description : An ideal sand for filters should be (A) Free from dirt and other impurities (B) Uniform in nature and size (C) Hard and resistant (D) All the above

Last Answer : (D) All the above

The average mean velocity of a stream having depth h, may be obtained by taking the average of the readings of a current meter at a depth of (A) 0.1 h and 0.9 h (B) 0.2 h and 0.8 h (C) 0.3 h and 0.7 h (D) 0.4 h and 0.6 h

Description : The average mean velocity of a stream having depth h, may be obtained by taking the average of the readings of a current meter at a depth of (A) 0.1 h and 0.9 h (B) 0.2 h and 0.8 h (C) 0.3 h and 0.7 h (D) 0.4 h and 0.6 h

Last Answer : Answer: Option B

For efficient working of a control meter, its throat length is approximately kept (A) Equal to the critical depth (B) Twice the critical depth (C) Three times the critical depth (D) Four times the critical depth

Description : For efficient working of a control meter, its throat length is approximately kept (A) Equal to the critical depth (B) Twice the critical depth (C) Three times the critical depth (D) Four times the critical depth

Last Answer : Answer: Option C

Select the incorrect statement. (A) The progress of work in low level method of mound construction is very slow (B) Barge method of mound construction is economical (C) In low level method of mound construction, the area of working is limited (D) In staging method of mound construction, the work is not interrupted even during stormy weather

Description : Select the incorrect statement. (A) The progress of work in low level method of mound construction is very slow (B) Barge method of mound construction is economical (C) In low level method ... (D) In staging method of mound construction, the work is not interrupted even during stormy weather

Last Answer : (B) Barge method of mound construction is economical

Pick up the correct statement from the following: A. The boning rod is used for checking the levels of the sewer inverts B. Manhole covers are made circular for the convenience of the cleaning staff C. A manhole is classified as shallow manhole if its depth is less than 0.9 m D. All the above

Description : Pick up the correct statement from the following: A. The boning rod is used for checking the levels of the sewer inverts B. Manhole covers are made circular for the convenience of the cleaning staff C. A manhole is classified as shallow manhole if its depth is less than 0.9 m D. All the above

Last Answer : ANS: D

Pick up the incorrect statement from the following: (A) While measuring a distance with a tape of length 100.005 m, the distance to be increasing by 0.005 m for each tape length (B) An increase in temperature causes a tape to increase in length and the measured distance is too large (C) The straight distance between end points of a suspended tape is reduced by an amount called the sag correction (D) A 100 m tape of cross section 10 mm × 0.25 mm stretches about 10 mm under 5 kg pull

Description : Pick up the incorrect statement from the following: (A) While measuring a distance with a tape of length 100.005 m, the distance to be increasing by 0.005 m for each tape length (B) An increase in ... ) A 100 m tape of cross section 10 mm 0.25 mm stretches about 10 mm under 5 kg pull

Last Answer : (B) An increase in temperature causes a tape to increase in length and the measured distance is too large

Pick up the incorrect statement from the following: (A) Dimensions are measured to the nearest 0.01 m (B) Areas are measured to the nearest 0.01 sq.m (C) Cubic contents are measured to the nearest 0.1 cum (D) Weights are measured to the nearest 0.001 tonnes

Description : Pick up the incorrect statement from the following: (A) Dimensions are measured to the nearest 0.01 m (B) Areas are measured to the nearest 0.01 sq.m (C) Cubic contents are measured to the nearest 0.1 cum (D) Weights are measured to the nearest 0.001 tonnes

Last Answer : (D) Weights are measured to the nearest 0.001 tonnes

Pick up the incorrect statement from the following: (A) No deduction is made for the volume occupied by reinforcement (B) No deduction is made for the openings upto 0.1 sq.m (C) No deduction is made for volumes occupied by pipes, not exceeding 100 sq.cm in crosssection (D) None of these

Description : Pick up the incorrect statement from the following: (A) No deduction is made for the volume occupied by reinforcement (B) No deduction is made for the openings upto 0.1 sq.m (C) No deduction is made for volumes occupied by pipes, not exceeding 100 sq.cm in crosssection (D) None of these

Last Answer : (D) None of these

Pick up the correct statement from the following: (A) The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm (B) The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm (C) The material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt (D) All the ab

Description : Pick up the correct statement from the following: (A) The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm (B) The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm ( ... having particles of size varying from 0.06 mm to 0.002 mm, is known as silt (D) All the ab

Last Answer : Answer: Option D