WorksheetsWASTE WATER STORY CLASS 7
Total questions: 27
Worksheet time: 14mins
Waste water from toilets is often referred to as-
grey water
black water
sludge
effluent
Process whereby water bodies receive excess nutrients-
algal bloom
water pollution
eutrophication
sewage
What is obtained after aeration step?
Primary sludge
secondary sludge
solid waste materials
In which step solid waste is removed using screens in waste water treatment.
Primary treatment
Secondary treatment
Tertiary treatment
Water polluted by various human activities causes a number of water-borne diseases. Which of the following is not a waterborne disease?
Cholera
Typhoid
Asthma
Dysentry
We should not throw paints and greasy substances down the drain because
they break the pipe
they harden and clog the pipe
they flow through the drain freely
None of these
The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as
pipeline transport
sewage system
transport system.
treatment plant.
An open-drain system is a breeding place for which of the following.
Flies
Mosquitoes
Organisms which cause diseases
All of these
Which of the following is/are products of wastewater treatment?
Biogas
Sludge
Aerator
Both biogas and sludge
What happens to the sewage in the first step of treatment?
The organic matter is eaten by bacteria.
The sewage water is aerated.
It is screened to remove solid wastes
It is filtered and disinfected.
What type of living things eat the organic matter in the sewage?
Plants
Animals
Bacteria
fungi
What is a sewage treatment plant?
The place where water is cleaned, filtered and tested before re-entering the water cycle.
The place where water is cleaned, filtered and tested before going to our houses.
The network of pipes that carry sewage (dirty water) from our houses.
The place where water is bottled for drinking.
What is happening in this image ?
Large objects are getting removed with the help of bar screens
waste is getting settled down in sedimentation tank
biogas is getting produced
none of these
what are the onsite sewage disposal system for human waste
septic tanks
composting pits
vermi-composting toilets
all of these
Solid waste extracted in sewage treatment
a) human waste
b) animal waste
c) both a and b
d) none of these
A plant which can absorb waste water rapidly and release pure water vapor to the atmosphere.
Sunflower
Rose
Eucalyptus
Lily
what are the by-products of WWTP ?
(a)
A (a) is a covered hole in the ground above the sewer pipelines.
We can disinfect water with chemicals like _________ and ________.
(a)
Sewage is a (a) waste.
The sludge is decomposed by (a) bacteria.
Waste water is treated in a (a) .
Sewage treatment process involve
Removal of solid material
Sedimentation
Aeration of clarified water
All of these
Floating impurities (such as grease and oils) in the sedimentation tank are removed by
Screens
skimmer
Cleaner
floater.
Adopting good ________ practices should be our way of life
eating
Sanitation
reading
nome of these
The organic impurities present in sewage are
Bacteria
phosphorus
human faeces
Nitrates
Anaerobic bacteria are added in the digester tank to decompose the organic matter to produce
biogas
Foul smell
sludge
sewage
