CBSE Latest

Science in Wastewater Story Category 7 Extraordinary Questions, Chapter 18

Science in Wastewater Story 7 Extra Questions Chapter 18 1


Wastewater Story Class 7 Science of Supplementary Questions Chapter 18

Wastewater Story Class 7 Science Further Questions Very Brief Answer Sort Questions

Question 1.
Wastewater is suitable for human consumption.
No, because it is dirty and has many illnesses that cause organisms like cholera, typhoid, and so forth.

Question 2.
Identify two chemical compounds used for disinfection of wastewater
Chlorine and Ozone

Question three.
Particular varieties of bogs have been designed in plane.

Report bogs used in areas with restricted water provide
Vermi Remedy Bogs

Question 5.
Identify the kind of rest room greatest fitted to use
Chemical Bogs

Question 6.
Identify two issues that can be ready from sludge extracted from wastewater remedy
Biogas and manure.

Question 7.
Eucalyptus timber are planted alongside drainage areas. Give a cause. [HOTS] Answer:
Eucalyptus timber are planted along the sewers as a result of these timber take up all the surplus wastewater shortly and release pure water vapor into the environment.

Query eight
Adding a load may be prevented at a waste water remedy plant.
By following proper sanitary and housing practices, creating less waste on a single degree, we will keep away from adding a load to the wastewater remedy plant.

Query 9
] Identify two inorganic impurities in wastewater. [NCERT Exemplar] Reply:
Inorganic impurities in wastewater are nitrates and phosphates

Query 10
Using dried sludge is talked about
It is used as a manure that returns to organic matter and nutrients in the soil

] Question 11
In what sort of rest room amenities are human feces treated in the green sea?
Vermi Processing Bogs

Query 12.

Chemical Bogs, Septic Tanks, Composting Containers, and so forth.

Question 13
There are some wastewater natural impurities.
Human feces, animal waste, oil, urea pesticides, herbicides, vegatables and fruits are natural impurities in wastewater.

Question 14
Mention the overall cleansing course of

Query 15.
World Water Day celebrated
March 22.

Query 16.
Query 16.

2005-2015 was declared the Worldwide Decade for Life Water

Query 17
Query 17
Wastewater remedy includes physical, chemical and organic strategies to remove numerous impurities.

Query 18
Clarify sewers and wastewater
Drainers are pipes that operate on a transp ort system that transports waste water from the point of origin to the final disposal website. Waste water from houses, industries, hospitals, workplaces and different uses known as waste water

Question 19
Used water shouldn’t be wasted. Do you agree?
The water used shouldn’t be wasted but needs to be cleaned.

Question 20.
Bleach powder combined with water, why? Assume and provides it the best purpose. [HOTS] Reply:
Bleach powder is combined with water to make it protected to drink as a result of it kills harmful micro organism in water

Question 21.
Pure water is a form of pure water. Clarify why or why not.
Natural water is just not all the time clear. It’s because all forms of water besides rainwater include salts dissolved therein.

Query 22.
Mention the importance of wastewater remedy crops in cities
Sewage remedy crops filter out insoluble substances that type water.

Query 23
Protozo is a causative organism with a river illness

Query 24.
Within the chemical strategy of water remedy, water is handled with some chemical compounds. Describe the chlorination in the light of it. [HOTS] Reply:
Chlorination is a process whereby chlorine (chemical) is added to water to make it protected for a drink.

Query 25.
Sanitation could be improved. Clarify what steps have to be taken to enhance it
To enhance upkeep necessities, cost-effective wastewater remedy techniques have to be inspired

Question 26.
Report the share of activated sludge
About 97% of the water is activated in the slurry

Question 27.
Animal waste, oil and urea are a few of the organic impurities current in waste water. Identify two extra organic impurities in the waste water. [NCERT Exemplar] Answer:
Fruit and vegetable waste, pesticides and herbicides are organic impurities that happen in non-animal waste, oil and urea

Wastewater Story Class 7 Science Additional Questions Brief answer to sort questions [19659003] Question 1
Open emptying is a serious concern in at the moment's days.
Open drainage is a serious concern for society as they create unhygienic circumstances.

Question 2.
Explain how wastewater is disposed of on an airplane

When an airplane landing, the crew destroyed the sewage correctly on the airport drain

Query 3

Drainage is a posh combination of suspended solids, organic and inorganic impurities, nutrients, saprotrophic and pathogenic micro organism and other microbes

Query 4
Two various preparations for sewage remedy are proposed
Two Various Arrangements for Waste Water Remedy

Query 5.
Restore and introduce better home administration practices.
Manage waste in our home earlier than disposal as follows:

  • Cooking oil and grease shouldn’t be thrown down the drain. They will harden and stop pipes. In open drainage, the grease supports the pores of the soil, decreasing its effectiveness in filtering water. Throw oil and grease into the trash
  • Used teal water, strong food stays, plush toys, cotton, sanitary towels, and so on. Also be thrown into the trash. These wastes suppress drains. They don’t permit free stream of oxygen.
  • Chemical compounds, reminiscent of paints, solvents, insecticides, medicines and engine oils must be 1 The position of display beams in wastewater remedy, not throwing into the sewer, as they kill helpful 2 Chlorination makes water appropriate for human consumption. In what method? microbes that digest organic waste.

Question 6
Water is naturally purified in water. Do you agree? Assume and explain. [HOTS] Reply:
Yes, the river water is naturally purified by a process just like that of a sewage remedy plant
Flowing because it flows via grass or weeds to move, mud and strong particles. filtered. At the bottom of a lake or stream, the microorganism brings chemical modifications to the water. The natural filtration course of removes pollution from round water all through the method, making it clear and worthwhile.

Question 7.
The phrases wastewater, sewers and drainage are interconnected. Are you able to clarify how? [NCERT Exemplar] Reply:
The phrases like sewage, sewers and drainage are interrelated because waste water is a mix of wastewater popping out of houses and other places. Sewer and drain pipes are sewer and drain pipes.

Question eight
Describe on-site disposal methods
Some organizations present hygienic on-site waste remedy know-how. These bogs do not require flushing. Coated drains run across the toilet seats to a biogas plant. The produced biogas is used as an power source

Question 9
The wastewater remedy plant has a number of steps in its operation
Aeration tank, sand removing tank, second sedimentation tank, bar show,
(a) Organize all the above steps in the right order in which they occur in the wastewater remedy plant .
(b) What stage provides a lot of the sludge? [HOTS] Reply:
(a) Column, sand and sand removing tank, first sedimentation tank, aeration tank, second sedimentation tank
(b) First sedimentation tank

Question 10

(a) We should always not throw used tea leaves to sink.
(b) We should not throw down cooking oil and fat. [NCERT Exemplar] Answer:
(a) We must not throw the used tea leaves into the sink because it may well suppress the washbasin drain tube.
(b) We must not throw down cooking oil and fats

Question 11.
Under is a mix of processes related to a wastewater remedy plant.
(a) The slurries are scraped off and the skimmer removes the floating grease
(b) Water is made to settle in a big container with a slope in the middle.
(c) Giant gadgets resembling plastic luggage are removed by passing waste water via bar displays.
(d) Sand, sand and rocks are made to descend by decreasing the rate of incoming wastewater.
(e) Wastewater comes into the sand and the sand is a waste container. NCERT Exemplar]
The right order of waste water remedy in the remedy plant is
. C) Giant gadgets comparable to plastic luggage are eliminated by passing waste water by means of column shows.
(e) Wastewater coming
(d) Sand, sand and rocks are made to descend by decreasing the speed of incoming wastewater.
(b) Water is made to settle in a large tank with a slope
(a) Sludge scraped off and flushing system to take away floating fats

Query 12
Can we promote sanitation in public places? Clear.
Yes, we all have a task to play in a clean and healthy surroundings. All of us can participate in sustaining sanitation in public locations. We must not scatter litters anyplace. If dust isn’t visible, we should always carry the litters residence and throw it in the trash.

Query 13.
Listed here are three statements that define terms, ie sludge, sewage, and waste water.
Select the best definition for each of those phrases.
(a) Strong solids eliminated by scraper with scraper
(b) Kitchen used for dishwashing
(c) Waste water from households, industries, hospitals and other public buildings. [NCERT Exemplar] Reply:
(a) In strong wastewater remedy, scraped strong solids are sludge.
b) The kitchen used for dishwashing is waste water

Question 14.
A man touring on a practice threw a clean meals package deal on a platform. Do you assume that is an applicable waste remedy technique? Develop. [NCERT Extmplar; HOTS] Reply:
No, you all the time need to put the waste in the close by trash or take it residence and eliminate it in the waste bins.
Wastes that are not properly disposed of can get into the sewer and block them.

Question 15.
When talking about treating contaminated water at house with aeration, filtration, and chlorination strategies, the next questions are answered:
(a) What modifications did we observe after the looks of the liquid after conditioning?
(b) What to do with a sand filter?
(c) Has chlorine modified the colour of handled water?
(d) Does chlorine odor?
(a) Carbonated water incorporates some suspended impurities, and the odor of contaminated water is totally decomposed after air con.
(b) Sand filter removes small suspended impurities
(c) Chlorine makes water
(d) Yes, chlorine has a particular odor that isn’t inferior to waste water

Query 16.
and answer the next questions:
(a) What does this chapter seem like?
(b) Report the features of each a part of the pattern? [HOTS]

  Science in Wastewater Story Category 7 Extra Questions Chapter 18 1
(a) This determine exhibits the availability of consuming water. and its source. Features of each part of the figure

  • River It is a water supply
  • Pumping station Pumping water to gather it in a tank
  • Sedimentation tank Pollutants choose the bottom of the tank
  • Sand and gravel and sand filter Take away filth from the water
  • Chlorine Chlorine Chlorine combined with water to disinfect the eater and kill the micro organism
  • In the upper tank The purified water is saved in this tank for supply to households for consuming. 19659042] Question 17
    Full the next desk on pollutant analysis

    Varieties of wastewater Hometown Pollutants Different feedback
    Sullage water
    ] Kitchen
    Dangerous waste Bogs
    Business Waste Industrial and Business Organizations

    Under is a desk of pollution that explains what kind of waste water their origin is contaminated.

    Sort of wastewater [1965907] four] Homeland Pollutants Different remarks
    Sullage water Kitchen Cooking oils, fat, and so on. Can enrich the sewer
    Dangerous waste
    Bogs Feces and urine Illnesses similar to dysentery, cholera, and so on.
    Business waste Industrial and business organizations Chemical compounds comparable to paints, solvents, engine oil, and so on. ] Water and Water Soil Air pollution

    Wastewater Story Class 7 Science Further Questions Lengthy Reply Sort Questions

    Question 1.
    Explain the totally different inorganic and natural impurities that often happen in wastewater
    Se is waste water for households, industries and different human activities. It also consists of rainwater that has handed via the road during a storm or heavy rain and is a liquid waste.
    Waste water composition
    The next elements type waste water:

    • Natural impurities in waste water are human feces, animal waste (akin to animal manure), urea (urine), oil, fruit and vegetable waste, pesticides, herbicide
    • Inorganic impurities in wastewater are nitrates, phosphates and metals
    • Vitamins in wastewater are nitrogen and phosphorus.
    • Bacteria present in waste water include micro organism that trigger water-borne illnesses similar to cholera and typhoid.
    • Other microbes contained in the sewer are protozoa that trigger a water-borne illness referred to as dysentery.

    Query 2.
    Describes a septic tank. How does it work?
    Low cost external wastewater techniques have been developed to care for places that don’t have a wastewater system, similar to rural areas, particular person buildings. These are described under:
    (i) Septic tanks A septic tank is a reasonable on-site sewage remedy system. Septic tanks are suitable when waste water just isn’t made. These tanks have to be cleaned every 4 or six months.

    A septic tank often consists of a giant, coated underground concrete having an inlet pipe at one end and an outlet pipe at one finish. The toilet seat is related to the septic tank inlet pipe. The human feces of the bathroom seat enter the septic tank by way of the inlet pipe. The strong part of the waste continues to construct up at the backside of the septic tank in the type of a slurry, while the aqueous waste remains above it

    Anaerobic bacteria break down a lot of the strong organic matter in the human faeces, ensuing in excessive quantity discount. The molten strong waste remains deposited on the underside of the septic tank. Water wastes are also purified with anaerobic bacteria. Extra water goes out by way of the septic tank by means of the outlet pipe and is absorbed into the soil.

    (ii) Composting Gutters These are self-sustaining waste remedy models that aren’t related to a sewer or septic tank.

    (iii) Chemical Bogs These bogs have restricted storage capacity for human waste and have to be emptied commonly. These are bogs that use a chemically handled container situated slightly below the toilet seats. Chemical compounds scale back the unpleasant odor brought on by human excretion and perform a partial disinfection of human waste.

    Question 3.
    Talk about the vermi processing states. Identify a useful product from such a rest room
    In a Vermi-treatment rest room, human feces are treated with umbrellas in a pit. The earthworms regularly eat all the organic matter current in the human stool, decompose it and journey out of its body in the type of heat casting (additionally referred to as vermicula).
    A helpful product from the Vermi-toilet is vermi

    Question 4.
    In the future, Sachin had been in the uncle who lives in the village. He saw numerous individuals there who protected themselves in an open space as a result of the appropriate rest room amenities are usually not there. He questioned concerning the contamination of groundwater as he studied in his class that this motion may cause water-borne sicknesses.
    (b) Determine two water-borne illnesses.
    (b) Explain vermicomposting amenities.
    (c) What values ​​does Sachin seem like? [Value Based Question] Answer:
    (a) Typhoid and cholera.
    (b) In Vermi composting bogs, human feces are treated in pits of inexperienced greens
    (c) He’s clever and conscious of health

    Question 5.
    There are lots of various wastewater remedy methods developed for group, people, opportunities. and so on. In line with needs. Enter the identify of the wastewater that can be utilized beneath the following circumstances:
    a) Rest room that may present top quality manure
    b) Rest room used in aircraft throughout flight
    d) Rest room used for restricted water provide
    (e) Rest room contaminating close by hand pump water. [HOTS] Reply:
    (a) Vermi composting amenities
    (b) Vacuum bogs
    (c) Chemical bogs
    (d) Compost areas
    (e) Septic tanks [19659004] [Kysymys 6]
    Assume and recommend some methods to attenuate the sources of waste and impurities if you take your house for instance.
    We will reduce wastes and impurities in water and create much less wastewater in a number of steps at house:

    • When not throwing used tea leaves, strong foods, and so forth., into the drain.
    • There are not any chemical compounds, comparable to medicines, paints, insecticides, and so on., in the drain as a result of they improve the pollution of the wastewater.

    Query 7.
    Trisha has seen large debris outdoors the landfill that isn’t often lost by the municipality of the world. He mentioned the issue together with his biology instructor and determined to arrange rallies to spread consciousness amongst native individuals.
    The following day, he gave this info to the meeting and guaranteed Schoolmates to hitch it. He additionally explained to them the significance of sanitation in public locations he had lately studied in biology.
    (a) Who’s chargeable for sustaining sanitation in public locations?
    (b) What would happen? if not all waste produced in public locations is disposed of frequently?
    (c) What are the values ​​introduced by Trisha? [Value Based Question] Answer:
    (a) I feel the task of the municipality is to take care of sanitation in public locations.
    b) If not all waste produced in public locations is frequently disposed of and correct epidemics can break
    (c) Duty, Sensitivity and Awareness of Public Hygiene

    Wastewater Story Class 7 Science Further Questions Different

    A number of Selection Questions
    Query 1.
    Open drainage system is a breeding floor for any of the next? [NCERT Exemplar] (a) Fly
    (b) Mosquitoes
    c) Illness-causing organisms
    d) All the above
    (d) All the above [19659004] Question 2.
    Which of the following isn’t an inorganic impurity in wastewater?
    (a) Nitrate
    (b) Phosphorus
    (c) Urea
    (d) Metallic salt
    (c) Urea

    Question 3
    [NCERT Exemplar] (a) liquid waste
    b) strong waste
    c) gaseous waste
    d) solid-gas mixture
    a) liquid waste

    ] Question four
    Cardio micro organism could be grown in clarified water
    (a) filtration
    (b) sewage
    (c) aeration
    d) sedimentation
    (c) aeration

    Question 5.
    Which of the next is / are products of sewage remedy? [NCERT Exemplar] (a) Biogas
    (b) Sludge
    c) Both biogas and slurry
    (d) Aerator
    (c) Both biogas and sludge

    Chlorine used in a municipal water remedy plant
    (a) Water Water Removing
    (b) Preventing Evaporation
    (c) Deadly Microorganisms
    (d) Preventing Sedimentation
    ] c) killing dangerous microorganisms

    Question 7.
    Which of the next organisms produces biogas from the sewage sludge of a sewage remedy plant
    (a) Anaerobic micro organism
    (b) Fungi
    (c) Aerobic micro organism
    ] (d) Protozoa
    (a) Anaerobic Bacteria

    Query eight
    The community of pipes used in houses or public buildings for wastewater remedy at a remedy plant is called [NCERT Exemplar] (a) sewers
    (b) drainage
    (c) transportation system
    (d) remedy nt plant
    (b) drainage

    Query 9
    One of many following Pu The gangs assist to wash the waste water fairly shortly when planted in all places alongside the sewer. These are
    a) Eucalyptus timber
    b) Ficus timber
    c) Neem timber
    d) Peepal timber
    a) Eucalyptus timber

    Question 10.
    Which of the following is the part of inorganic pollutants in wastewater? [NCERT Exemplar] (a) Pesticides
    (b) Urea
    (c) Phosphates
    (d) Plant Waste
    (c) Phosphates

    Question 11

    II It’s used to disinfect water
    III It absorbs ultraviolet rays
    is about three%
    (a) I and II
    (b) II and III
    (c) I and II III
    (d) II and IV
    b) II and III

    Query 12.
    In a filtration plant, water is filtered utilizing
    (a) sand and clay
    (b) ) clay and superb gravel
    (c) sand and advantageous gravel
    d) sand, positive gravel and center gravel
    d) sand, superb gravel and middle gravel

    Question 13
    Which of the following
    (a) Hen odor
    b) Dangerous style
    (c) Di rty look
    d) All of these
    Question 14.
    Interval 2 005-2015 is taken into account to be a world act
    ] (a) water for all times
    (b) schooling for all
    c) international warming
    d) terrorism
    (a) water life for

    Query 15
    The primary holes in the drains are situated
    (a) 20-25 m
    (b) 50-60 m
    (c) 90-100 m
    (d) 100 – 110 m
    (b) 50-60 m

    Question 16.
    Which of those is a part of a wastewater remedy plant?
    (a) Selver
    (b)) Vertical beams
    (c) Aeration tank
    d) All these
    (d) All of those

    Query 17
    Which of those methods shouldn’t be used to eliminate urine and faeces if no wastewater system is accessible?
    (a) Discharge of untreated wastewater into rivers
    (b) Etiquette tanks
    (c) Waste water move to a biogas plant
    d) Use of Vermi composting jet
    (a) Untreated waste water Releasing Rivers

    Filling the Blanks
    1. Untreated human feces are ………………. hazard.
    2. Vermi composting machines use ………………. for human waste remedy
    three. Poor sanitation is filled with public locations that can result in spread ………………. .
    four. Dry sludge is used ………………. .
    5. Waste water remedy ……………….
    6. Waste water discharged by houses known as ………………. .
    7. Everlasting water clogged with sewer is an effective breeding ground ………………. .
    8. All moveable bogs are ………………. rest room.
    9. The entire wastewater remedy plant design is ………………. .
    10. Bacteria are essential ………………. wastewater remedy
    1. Well being
    2. Colours
    3. Illnesses
    4th Sludge Activator
    fifth Waste
    6. Waste Water
    eight. chemical
    9. sewage remedy plant
    10th position

    True / False
    1. Waste water is a strong waste that causes water air pollution and soil contamination. [NCERT Exemplar] 2. Used water is waste water
    three. Waste water could possibly be reused
    4. If underground drainage techniques and waste remedy methods usually are not out there, excessive value on-site sanitation might be introduced. [NCERT Exemplar] 5. We should always not drain, as a result of untreated human waste is harmful to well being.
    6. Food oil, fats should not be thrown immediately into the drainage system
    7. Household waste also incorporates microorganisms
    8. Poor sanitation and contaminated consuming water are the cause of many illnesses.
    9. Waste water is transparent, colorless, odorless
    10. Tuberculosis is a water-borne disease
    11. Cardio micro organism produce a biogas slurry in a cooking tank.
    12. urea is an inorganic impurity in wastewater
    1. Fallacious, wastewater is liquid waste that causes water pollution and soil air pollution
    2. True
    three. True
    four The incorrect cleansing system
    5. True
    6. True
    7. True
    8. True
    9. Incorrect consuming water is improper, if the underground drainage methods and waste remedy methods aren’t obtainable. clear, colorless and odorless.
    10. False, water-borne sicknesses embrace cholera, typhoid fever, dysentery, and so on.
    11. False, anaerobic micro organism produce biogas
    12. Fallacious, urea is in an organic impurity that happens in waste water

    ] Kysymys 1.
    Sovita sarake I sarakkeeseen II

    Sarake I Sarake II Sarake II
    Sarake II
    Epäorgaaniset epäpuhtaudet (i) Fosfori ja typpi
    ( b) Orgaaniset epäpuhtaudet (ii) Nitraatit ja fosfaatit
    (c) Ravintoaineet (iii) Kolera ja lavantauti
    (d) Bakteerit iv) Torjunta-aineet ja rikkakasvien torjunta-aineet [19659163]Vastaukset:
    (a) – (ii)
    (b) – (iv)
    (c) – (i)
    (d) – (iii) [19659164]Lisäkysymykset luokan 7 tiedettä varten