When does the particle become suspended in expanded bed?

When superficial velocity is constant

When superficial velocity is greater than critical velocity

When superficial velocity is less than critical velocity

When superficial velocity is equal to critical velocity

When superficial velocity is constant

How the problem of sand incrustation can be minimized?

Proportioning of layers of sand and gravel

Control of algae growth in the water

Which of the following is the expression of the Rose equation where symbols have their usual meanings?

hf = f* (L/(s *d)) * ((1-e) /e3 ) * (v/g)

hf = f* (L/(s *d)) * ((1-e) /e3 ) * (v2/g)

hf = f* (L/(s *d)) * ((1-e) /e3 ) * (v/g)

) * ((1-e) /e4 ) * (v2/g)d) hf = f* (L/(s *d)) * ((1-e) /e2 ) * (v2/g)

How is the grain size distribution of sand in rapid sand filter?

Layered with heaviest grains at the top

Layered with lightest grains at the top

The tendency of jetting can be minimized by

Control of algae growth in the water

Proportioning of layers of sand and gravel

Control of algae growth in the water

The superficial velocity in a stratified bed is equal to

Terminal settling velocity * porosity

Terminal settling velocity * (porosity) 2

Terminal settling velocity * (porosity) 4.5

Which of the following order is correct regarding the thickness of layer of the materials used in the mixed media filter?

Anthracite coal = Sand = Garnet sand

Anthracite coal > Sand >> Garnet sand

Anthracite coal = Sand = Garnet sand

Anthracite coal < Sand < Garnet sand

The under drainage system in pressure consists of

Central drains connected to lateral drain

Identify the correct statement from the following options.

Rapid sand filter has a high initial cost

Coagulation is essential in slow sand filter

Slow sand filter requires skilled supervision

Period of cleaning of Rapid sand filter is 1-2 days

Which of the following order is correct regarding the specific gravity of the materials used in the mixed media filter?

Anthracite coal > Sand > Garnet sand

Anthracite coal = Sand = Garnet sand

Anthracite coal < Sand < Garnet sand

50 + Mcqs in Filtration in Environmental Science Page 1 McqOptions

1.	Consider the following statement1. The penetration of suspended matter is deep in the slow sand filter2. The penetration of suspended matter is superficial in the rapid sand filter3. Coagulation is not required in the slow sand filterWhich of the above statement is/are correct?
A.	Only 3
B.	1, 2
C.	1, 2, 3
D.	2, 3
Answer» B. 1, 2

Discussion

2.	What is the maximum filter head up to which slow sand filters are worked upon?
A.	25cm
B.	50cm
C.	75cm
D.	100cm
Answer» D. 100cm

Discussion

3.	When does the particle become suspended in expanded bed?
A.	When superficial velocity is greater than critical velocity
B.	When superficial velocity is less than critical velocity
C.	When superficial velocity is equal to critical velocity
D.	When superficial velocity is constant
Answer» D. When superficial velocity is constant

Discussion

4.	The value of specific gravity for Garnet sand is ____
A.	2.1
B.	3.6
C.	4.2
D.	5.1
Answer» D. 5.1

Discussion

5.	_______ type of trouble in filter is caused by the released of dissolved air and gases from water.
A.	Air binding
B.	Clogging
C.	Mud balls
D.	Jetting
Answer» B. Clogging

Discussion

6.	The maximum daily demand of a city is 24*105 and the rate of filtration is 100 per litre per hour per m2. What is the area of the filter?
A.	10
B.	100
C.	1000
D.	1500
Answer» D. 1500

Discussion

7.	The bacterial removal efficiency of the rapid sand filter is ______ in comparison to slow sand filter.
A.	More
B.	Less
C.	Equal
D.	Better
Answer» C. Equal

Discussion

8.	State whether the following statement is true or false.The slow sand filter is efficient in removing turbidity of water.
A.	True
B.	False
Answer» C.

Discussion

9.	In mixed media filter, the filtration is done from ______
A.	Fine to finer
B.	Coarse to coarser
C.	Fine to coarse
D.	Coarse to fine
Answer» E.

Discussion

10.	The period of cleaning of a slow sand filter is ______ than rapid sand filter.
A.	Smaller
B.	Larger
C.	Slightly smaller
D.	Slightly larger
Answer» C. Slightly smaller

Discussion

11.	State whether the following statement is true or false.Rapid sand filters are very efficient in removal of color.
A.	True
B.	False
Answer» B. False

Discussion

12.	Consider the following statement regarding depth of sand of the rapid gravity filter?1. It should be checked against breakage of floc2. The sand depth should lie between 100-200cm3. The floc should be attached through the sand bedWhich of the above statement is/are correct?
A.	Only 1
B.	1, 2
C.	2, 3
D.	Only 2
Answer» B. 1, 2

Discussion

13.	How the problem of sand incrustation can be minimized?
A.	Carbonating the water
B.	Proportioning of layers of sand and gravel
C.	Surface washing
D.	Control of algae growth in the water
Answer» B. Proportioning of layers of sand and gravel

Discussion

14.	State whether the following statement is true or falseRose equation is valid for beds in which voids are clear and unobstructed.
A.	True
B.	False
Answer» B. False

Discussion

15.	What is the ratio in which coal, sand and garnet are present in the mixed media filter?
A.	2: 3: 5
B.	4: 2: 1
C.	6: 3: 1
D.	1: 2: 3
Answer» D. 1: 2: 3

Discussion

16.	Which device is used to supply air for the agitation of sand grains during washing of filters?
A.	Rate control device
B.	Tube settlers
C.	Air compressors
D.	Flocculator
Answer» D. Flocculator

Discussion

17.	The filter run in rapid sand filter should not be less than _____ hours.
A.	1
B.	6
C.	12
D.	24
Answer» E.

Discussion

18.	Consider the following statements regarding diatomite filters.1. They are not used for water having high turbidity.2. They are not suitable for municipal water supplies.3. They are not used for temporary and shifting camps.Which of the above statement is/are false?
A.	1, 2,3
B.	1 only
C.	2 only
D.	3 only
Answer» E.

Discussion

19.	In which type of under drainage system of rapid sand filter, laterals are provided with strainers?
A.	Perforated pipe system
B.	Pipe and strainer system
C.	Wheeler system
D.	Wagner system
Answer» C. Wheeler system

Discussion

20.	Which of the following is the expression of the Rose equation where symbols have their usual meanings?
A.	hf = f* (L/(s d)) ((1-e) /e3 ) * (v2/g)
B.	hf = f* (L/(s d)) ((1-e) /e3 ) * (v/g)
C.	hf = f* (L/(s *
D.	) * ((1-e) /e4 ) * (v2/g)d) hf = f* (L/(s d)) ((1-e) /e2 ) * (v2/g)
Answer» B. hf = f* (L/(s d)) ((1-e) /e3 ) * (v/g)

Discussion

21.	The turbidity of water applied to rapid sand filter is less than _______
A.	35-40ppm
B.	10-20ppm
C.	30-40ppm
D.	10-15ppm
Answer» B. 10-20ppm

Discussion

22.	The slow sand filter is designed for
A.	Maximum daily demand
B.	Maximum yearly demand
C.	Average daily demand
D.	Maximum weekly demand
Answer» B. Maximum yearly demand

Discussion

23.	In which of the following filters, the rate of filtration is highest?
A.	Slow sand filter
B.	Rapid sand filter
C.	Pressure filter
D.	Roughing filter
Answer» D. Roughing filter

Discussion

24.	The rate of filtration of pressure filtration is ______ l/m2/hour.
A.	1000-5000
B.	5000-10000
C.	6000-8000
D.	6000-15000
Answer» E.

Discussion

25.	Carmen-Kozney equation has been derived using which of the following equation?
A.	Cole brook white equation
B.	Bernoulli equation
C.	Darcy Weisbach equation
D.	Swamee jain equation
Answer» D. Swamee jain equation

Discussion

26.	The filtration rate of a slow sand filter is _____ litres of water per square metre.
A.	20
B.	30
C.	50
D.	100
Answer» E.

Discussion

27.	State whether the following statement is true or false.The up flow filter is used in domestic water supply.
A.	True
B.	False
Answer» C.

Discussion

28.	The thickness of the base material of a rapid sand filter on which filter media are supported is
A.	45-60cm
B.	20-80cm
C.	30-75cm
D.	10-30cm
Answer» B. 20-80cm

Discussion

29.	How is the grain size distribution of sand in rapid sand filter?
A.	Stratified
B.	Unlayered
C.	Layered with heaviest grains at the top
D.	Layered with lightest grains at the top
Answer» E.

Discussion

30.	The minimum depth of sand of a rapid sand filter is given by
A.	Stokes formula
B.	Clark's formula
C.	Hudson formula
D.	Emden formula
Answer» D. Emden formula

Discussion

31.	The tendency of jetting can be minimized by
A.	Carbonating the water
B.	Proportioning of layers of sand and gravel
C.	Surface washing
D.	Control of algae growth in the water
Answer» D. Control of algae growth in the water

Discussion

32.	Which material is provided for the up flow bed in dual media bi-flow filter?
A.	Anthracite
B.	Sand
C.	Rice husk
D.	Graphite
Answer» C. Rice husk

Discussion

33.	The superficial velocity in a stratified bed is equal to
A.	Terminal settling velocity
B.	Terminal settling velocity * porosity
C.	Terminal settling velocity * (porosity) 2
D.	Terminal settling velocity * (porosity) 4.5
Answer» E.

Discussion

34.	The final loss of head in slow sand filter is ______ than rapid sand filter.
A.	Higher
B.	Lower
C.	Slightly Lower
D.	Equivalent
Answer» C. Slightly Lower

Discussion

35.	Which of the following order is correct regarding the thickness of layer of the materials used in the mixed media filter?
A.	Anthracite coal < Sand > Garnet sand
B.	Anthracite coal > Sand >> Garnet sand
C.	Anthracite coal = Sand = Garnet sand
D.	Anthracite coal < Sand < Garnet sand
Answer» C. Anthracite coal = Sand = Garnet sand

Discussion

36.	The diatomite is applied on the septum at the rate of ______
A.	100gm/m2
B.	200gm/m2
C.	300gm/m2
D.	400gm/m2
Answer» D. 400gm/m2

Discussion

37.	Consider the following statements regarding sand as filter material.1. It should be free from clay or silt2. Organic matter should be present in the sand3. It should be nonuniformWhich of the above statement is/are correct?
A.	1, 2
B.	1 only
C.	2, 3
D.	1, 2, 3
Answer» C. 2, 3

Discussion

38.	The under drainage system in pressure consists of
A.	Central drains connected to lateral drain
B.	Wheeler system
C.	Wagner system
D.	Pipe grids, false bottom
Answer» E.

Discussion

39.	State whether the following statement is true or false.Schmutzdecke acts as an extremely fine meshed straining mat.
A.	True
B.	False
Answer» B. False

Discussion

40.	The value of uniformity coefficient for uniformly graded sand is ______
A.	0
B.	1
C.	10
D.	100
Answer» C. 10

Discussion

41.	Consider the following statements regarding pressure filter1. It is easy to inspect the under drainage system2. It is not possible to provide time for chlorination in direct supply from it3. It is not possible to observe the degree of back washing and the agitation processWhich of the above statement is correct?
A.	1 only
B.	2, 3
C.	1, 2, 3
D.	1, 3
Answer» C. 1, 2, 3

Discussion

42.	What is the thickness of a layer of a diatomite filter?
A.	1mm
B.	2mm
C.	3mm
D.	4mm
Answer» D. 4mm

Discussion

43.	What is the frequency of cleaning of a slow sand filter?
A.	1 week
B.	1-3 months
C.	2-3 days
D.	2-3 weeks
Answer» C. 2-3 days

Discussion

44.	State whether the following statement is true of false.Filtration operation in pressure filter is same as in rapid sand filter.
A.	True
B.	False
Answer» C.

Discussion

45.	In the ________ zone of purification in filter media, bacteria oxidizes the organic matter completely.
A.	Autotrophic
B.	Heterotrophic
C.	Schmutzdecke
D.	Electrolytic
Answer» C. Schmutzdecke

Discussion

46.	Consider the following statement1. The slow sand filter is not efficient in removing turbidity2. The slow sand filter has a high initial cost3. Skilled supervision is required in slow sand filterWhich of the above statement is/are correct?
A.	Only 3
B.	1, 2
C.	1, 2, 3
D.	2, 3
Answer» C. 1, 2, 3

Discussion

47.	Identify the correct statement from the following options.
A.	Rapid sand filter has a high initial cost
B.	Coagulation is essential in slow sand filter
C.	Slow sand filter requires skilled supervision
D.	Period of cleaning of Rapid sand filter is 1-2 days
Answer» E.

Discussion

48.	Which of the following order is correct regarding the specific gravity of the materials used in the mixed media filter?
A.	Anthracite coal < Sand > Garnet sand
B.	Anthracite coal > Sand > Garnet sand
C.	Anthracite coal = Sand = Garnet sand
D.	Anthracite coal < Sand < Garnet sand
Answer» E.

Discussion

49.	Consider the following statement1. Slow sand filter is not flexible in variation in demand2. The rapid sand filter is flexible in fluctuations in demand3. The method of cleaning of a slow sand filter involves agitation and back-washingWhich of the above statement is/are correct?
A.	1, 2
B.	1, 2, 3
C.	2, 3
D.	Only 3
Answer» B. 1, 2, 3

Discussion

50.	What is CU in the expression CU= D60/D10 where D60 and D10 are the sizes of particle such that 60% and 10% of the particles are finer than these sizes respectively?
A.	Coefficient of compaction
B.	Coefficient of consolidation
C.	Uniformity coefficient
D.	Effective size
Answer» D. Effective size

Discussion

Explore topic-wise MCQs in Environmental Science.

Consider the following statement1. The penetration of suspended matter is deep in the slow sand filter2. The penetration of suspended matter is superficial in the rapid sand filter3. Coagulation is not required in the slow sand filterWhich of the above statement is/are correct?

What is the maximum filter head up to which slow sand filters are worked upon?

When does the particle become suspended in expanded bed?

The value of specific gravity for Garnet sand is ____

_______ type of trouble in filter is caused by the released of dissolved air and gases from water.

The maximum daily demand of a city is 24*105 and the rate of filtration is 100 per litre per hour per m2. What is the area of the filter?

The bacterial removal efficiency of the rapid sand filter is ______ in comparison to slow sand filter.

State whether the following statement is true or false.The slow sand filter is efficient in removing turbidity of water.

In mixed media filter, the filtration is done from ______

The period of cleaning of a slow sand filter is ______ than rapid sand filter.

State whether the following statement is true or false.Rapid sand filters are very efficient in removal of color.

Consider the following statement regarding depth of sand of the rapid gravity filter?1. It should be checked against breakage of floc2. The sand depth should lie between 100-200cm3. The floc should be attached through the sand bedWhich of the above statement is/are correct?

How the problem of sand incrustation can be minimized?

State whether the following statement is true or falseRose equation is valid for beds in which voids are clear and unobstructed.

What is the ratio in which coal, sand and garnet are present in the mixed media filter?

Which device is used to supply air for the agitation of sand grains during washing of filters?

The filter run in rapid sand filter should not be less than _____ hours.

Consider the following statements regarding diatomite filters.1. They are not used for water having high turbidity.2. They are not suitable for municipal water supplies.3. They are not used for temporary and shifting camps.Which of the above statement is/are false?

In which type of under drainage system of rapid sand filter, laterals are provided with strainers?

Which of the following is the expression of the Rose equation where symbols have their usual meanings?

The turbidity of water applied to rapid sand filter is less than _______

The slow sand filter is designed for

In which of the following filters, the rate of filtration is highest?

The rate of filtration of pressure filtration is ______ l/m2/hour.

Carmen-Kozney equation has been derived using which of the following equation?

The filtration rate of a slow sand filter is _____ litres of water per square metre.

State whether the following statement is true or false.The up flow filter is used in domestic water supply.

The thickness of the base material of a rapid sand filter on which filter media are supported is

How is the grain size distribution of sand in rapid sand filter?

The minimum depth of sand of a rapid sand filter is given by

The tendency of jetting can be minimized by

Which material is provided for the up flow bed in dual media bi-flow filter?

The superficial velocity in a stratified bed is equal to

The final loss of head in slow sand filter is ______ than rapid sand filter.

Which of the following order is correct regarding the thickness of layer of the materials used in the mixed media filter?

The diatomite is applied on the septum at the rate of ______

Consider the following statements regarding sand as filter material.1. It should be free from clay or silt2. Organic matter should be present in the sand3. It should be nonuniformWhich of the above statement is/are correct?

The under drainage system in pressure consists of

State whether the following statement is true or false.Schmutzdecke acts as an extremely fine meshed straining mat.

The value of uniformity coefficient for uniformly graded sand is ______

What is the thickness of a layer of a diatomite filter?

What is the frequency of cleaning of a slow sand filter?

State whether the following statement is true of false.Filtration operation in pressure filter is same as in rapid sand filter.

In the ________ zone of purification in filter media, bacteria oxidizes the organic matter completely.

Consider the following statement1. The slow sand filter is not efficient in removing turbidity2. The slow sand filter has a high initial cost3. Skilled supervision is required in slow sand filterWhich of the above statement is/are correct?

Identify the correct statement from the following options.

Which of the following order is correct regarding the specific gravity of the materials used in the mixed media filter?

Consider the following statement1. Slow sand filter is not flexible in variation in demand2. The rapid sand filter is flexible in fluctuations in demand3. The method of cleaning of a slow sand filter involves agitation and back-washingWhich of the above statement is/are correct?

What is CU in the expression CU= D60/D10 where D60 and D10 are the sizes of particle such that 60% and 10% of the particles are finer than these sizes respectively?